INDICATIONS & USAGE SECTION.

INDICATIONS AND USAGE. Hairy Cell Leukemia. INTRON(R) is indicated for the treatment of patients 18 years of age or older with hairy cell leukemia.. Malignant Melanoma. INTRON is indicated as adjuvant to surgical treatment in patients 18 years of age or older with malignant melanoma who are free of disease but at high risk for systemic recurrence, within 56 days of surgery.. Follicular Lymphoma. INTRON is indicated for the initial treatment of clinically aggressive (see Clinical Pharmacology) follicular Non-Hodgkins Lymphoma in conjunction with anthracycline-containing combination chemotherapy in patients 18 years of age or older. Efficacy of INTRON therapy in patients with low-grade, low-tumor burden follicular Non-Hodgkins Lymphoma has not been demonstrated.. Condylomata Acuminata. INTRON is indicated for intralesional treatment of selected patients 18 years of age or older with condylomata acuminata involving external surfaces of the genital and perianal areas (see DOSAGE AND ADMINISTRATION).The use of this product in adolescents has not been studied.. AIDS-Related Kaposis Sarcoma. INTRON is indicated for the treatment of selected patients 18 years of age or older with AIDS-Related Kaposis Sarcoma. The likelihood of response to INTRON therapy is greater in patients who are without systemic symptoms, who have limited lymphadenopathy and who have relatively intact immune system as indicated by total CD4 count.. Chronic Hepatitis C. INTRON is indicated for the treatment of chronic hepatitis in patients 18 years of age or older with compensated liver disease who have history of blood or blood-product exposure and/or are HCV antibody positive. Studies in these patients demonstrated that INTRON therapy can produce clinically meaningful effects on this disease, manifested by normalization of serum alanine aminotransferase (ALT) and reduction in liver necrosis and degeneration.A liver biopsy should be performed to establish the diagnosis of chronic hepatitis. Patients should be tested for the presence of antibody to HCV. Patients with other causes of chronic hepatitis, including autoimmune hepatitis, should be excluded. Prior to initiation of INTRON therapy, the physician should establish that the patient has compensated liver disease. The following patient entrance criteria for compensated liver disease were used in the clinical studies and should be considered before INTRON treatment of patients with chronic hepatitis C:No history of hepatic encephalopathy, variceal bleeding, ascites, or other clinical signs of decompensationBilirubinLess than or equal to mg/dLAlbumin Stable and within normal limitsProthrombin Time Less than seconds prolongedWBCGreater than or equal to 3000/mm3 PlateletsGreater than or equal to 70,000/mm3 Serum creatinine should be normal or near normal.Prior to initiation of INTRON therapy, CBC and platelet counts should be evaluated in order to establish baselines for monitoring potential toxicity. These tests should be repeated at Weeks and following initiation of INTRON therapy, and monthly thereafter. Serum ALT should be evaluated at approximately 3-month intervals to assess response to treatment (see DOSAGE AND ADMINISTRATION).Patients with preexisting thyroid abnormalities may be treated if thyroid-stimulating hormone (TSH) levels can be maintained in the normal range by medication. TSH levels must be within normal limits upon initiation of INTRON treatment and TSH testing should be repeated at and months (see PRECAUTIONS, Laboratory Tests).INTRON in combination with REBETOL(R) is indicated for the treatment of chronic hepatitis in patients years of age and older with compensated liver disease previously untreated with alpha interferon therapy and in patients 18 years of age and older who have relapsed following alpha interferon therapy. See REBETOL prescribing information for additional information.. No history of hepatic encephalopathy, variceal bleeding, ascites, or other clinical signs of decompensation. Bilirubin. Albumin Prothrombin Time WBC. Platelets. Chronic Hepatitis B. INTRON is indicated for the treatment of chronic hepatitis in patients year of age or older with compensated liver disease. Patients who have been serum HBsAg positive for at least months and have evidence of HBV replication (serum HBeAg positive) with elevated serum ALT are candidates for treatment. Studies in these patients demonstrated that INTRON therapy can produce virologic remission of this disease (loss of serum HBeAg) and normalization of serum aminotransferases. INTRON therapy resulted in the loss of serum HBsAg in some responding patients.Prior to initiation of INTRON therapy, it is recommended that liver biopsy be performed to establish the presence of chronic hepatitis and the extent of liver damage. The physician should establish that the patient has compensated liver disease. The following patient entrance criteria for compensated liver disease were used in the clinical studies and should be considered before INTRON treatment of patients with chronic hepatitis B:No history of hepatic encephalopathy, variceal bleeding, ascites, or other signs of clinical decompensationBilirubinNormalAlbumin Stable and within normal limitsProthrombin Time Adults less than seconds prolonged Pediatrics less than or equal to seconds prolongedWBCGreater than or equal to 4000/mm3 PlateletsAdults greater than or equal to 100,000/mm3 Pediatrics greater than or equal to 150,000/mm3 Patients with causes of chronic hepatitis other than chronic hepatitis or chronic hepatitis should not be treated with INTRON A. CBC and platelet counts should be evaluated prior to initiation of INTRON therapy in order to establish baselines for monitoring potential toxicity. These tests should be repeated at treatment Weeks 1, 2, 4, 8, 12, and 16. Liver function tests, including serum ALT, albumin, and bilirubin, should be evaluated at treatment Weeks 1, 2, 4, 8, 12, and 16. HBeAg, HBsAg, and ALT should be evaluated at the end of therapy, as well as 3- and 6-months post-therapy, since patients may become virologic responders during the 6-month period following the end of treatment. In clinical studies in adults, 39% (15/38) of responding patients lost HBeAg to months following the end of INTRON therapy. Of responding patients who lost HBsAg, 58% (7/12) did so to months post-treatment.A transient increase in ALT greater than or equal to times baseline value (flare) can occur during INTRON therapy for chronic hepatitis B. In clinical trials in adults and pediatrics, this flare generally occurred to 12 weeks after initiation of therapy and was more frequent in responders (adults 63%, 24/38; pediatrics 59%, 10/17) than in nonresponders (adults 27%, 13/48; pediatrics 35%, 19/55). However, in adults and pediatrics, elevations in bilirubin greater than or equal to mg/dL (greater than or equal to times ULN) occurred infrequently (adults 2%, 2/86; pediatrics 3%, 2/72) during therapy. When ALT flare occurs, in general, INTRON therapy should be continued unless signs and symptoms of liver failure are observed. During ALT flare, clinical symptomatology and liver function tests including ALT, prothrombin time, alkaline phosphatase, albumin, and bilirubin, should be monitored at approximately 2-week intervals (see WARNINGS).. No history of hepatic encephalopathy, variceal bleeding, ascites, or other signs of clinical decompensation. Bilirubin. Albumin Prothrombin Time WBC. Platelets.

PRECAUTIONS SECTION.

PRECAUTIONS. General. Acute serious hypersensitivity reactions (e.g., urticaria, angioedema, bronchoconstriction, anaphylaxis) have been observed rarely in INTRON(R) A-treated patients; if such an acute reaction develops, the drug should be discontinued immediately and appropriate medical therapy instituted. Transient rashes have occurred in some patients following injection, but have not necessitated treatment interruption.While fever may be related to the flu-like syndrome reported commonly in patients treated with interferon, other causes of persistent fever should be ruled out.There have been reports of interferon, including INTRON A, exacerbating preexisting psoriasis and sarcoidosis as well as development of new sarcoidosis. Therefore, INTRON therapy should be used in these patients only if the potential benefit justifies the potential risk.Variations in dosage, routes of administration, and adverse reactions exist among different brands of interferon. Therefore, do not use different brands of interferon in any single treatment regimen.. Triglycerides. Elevated triglyceride levels have been observed in patients treated with interferons, including INTRON therapy. Elevated triglyceride levels should be managed as clinically appropriate. Hypertriglyceridemia may result in pancreatitis. Discontinuation of INTRON therapy should be considered for patients with persistently elevated triglycerides (e.g., triglycerides greater than 1000 mg/dL) associated with symptoms of potential pancreatitis, such as abdominal pain, nausea, or vomiting.. Drug Interactions. Interactions between INTRON and other drugs have not been fully evaluated. Caution should be exercised when administering INTRON therapy in combination with other potentially myelosuppressive agents such as zidovudine. Concomitant use of alpha interferon and theophylline decreases theophylline clearance, resulting in 100% increase in serum theophylline levels.. Information for Patients. Patients receiving INTRON alone or in combination with REBETOL(R) should be informed of the risks and benefits associated with treatment and should be instructed on proper use of the product. To supplement your discussion with patient, you may wish to provide patients with copy of the MEDICATION GUIDE.Patients should be informed of, and advised to seek medical attention for, symptoms indicative of serious adverse reactions associated with this product. Such adverse reactions may include depression (suicidal ideation), cardiovascular (chest pain), ophthalmologic toxicity (decrease in/or loss of vision), pancreatitis or colitis (severe abdominal pain), and cytopenias (high persistent fevers, bruising, dyspnea). Patients should be advised that some side effects such as fatigue and decreased concentration might interfere with the ability to perform certain tasks. Patients who are taking INTRON in combination with REBETOL must be thoroughly informed of the risks to fetus. Female patients and female partners of male patients must be told to use two forms of birth control during treatment and for six months after therapy is discontinued (see MEDICATION GUIDE).Patients should be advised to remain well hydrated during the initial stages of treatment and that use of an antipyretic may ameliorate some of the flu-like symptoms.If decision is made to allow patient to self-administer INTRON A, they should be instructed, based on their treatment, if they should inject dose of INTRON(R) subcutaneously or intramuscularly. If it is too difficult for them to inject themselves, they should be instructed to ask someone who has been trained to give the injection to them. Patients should be instructed on the importance of site selection for self-administering the injection, as well as the importance on rotating the injection sites. puncture resistant container for the disposal of needles and syringes should be supplied. Patients self-administering INTRON should be instructed on the proper disposal of needles and syringes and cautioned against reuse.Patients should be instructed that the Sterile Water for Injection vial supplied with Intron Powder for Injection contains an excess amount of diluent (5 mL) and only mL should be withdrawn to reconstitute Intron Powder for Injection. The vial of Sterile Water for Injection is intended for single-dose only. Discard the unused portion of sterile water. Do not save or reuse.. Dental and Periodontal Disorders. Dental and periodontal disorders have been reported in patients receiving ribavirin and interferon combination therapy. In addition, dry mouth could have damaging effect on teeth and mucous membranes of the mouth during long-term treatment with the combination of REBETOL and interferon alfa-2b. Patients should brush their teeth thoroughly twice daily and have regular dental examinations. In addition, some patients may experience vomiting. If this reaction occurs, they should be advised to rinse out their mouth thoroughly afterwards.. Laboratory Tests. In addition to those tests normally required for monitoring patients, the following laboratory tests are recommended for all patients on INTRON therapy, prior to beginning treatment and then periodically thereafter.Standard hematologic tests -- including hemoglobin, complete and differential white blood cell counts, and platelet count.Blood chemistries -- electrolytes, liver function tests, and TSH.Monitor hepatic function with serum bilirubin, ALT (alanine transaminase), AST (aspartate aminotransferase), alkaline phosphatase, and LDH (lactate dehydrogenase) at 2, and 12 weeks following initiation of INTRON A, then every months while receiving INTRON A. Permanently discontinue INTRON for evidence of severe (Grade 3) hepatic injury or hepatic decompensation (Child-Pugh score >6 [class and C]).Those patients who have preexisting cardiac abnormalities and/or are in advanced stages of cancer should have electrocardiograms taken prior to and during the course of treatment.Mild-to-moderate leukopenia and elevated serum liver enzyme (SGOT) levels have been reported with intralesional administration of INTRON (see ADVERSE REACTIONS); therefore, the monitoring of these laboratory parameters should be considered.Baseline chest X-rays are suggested and should be repeated if clinically indicated.For malignant melanoma patients, differential WBC count and liver function tests should be monitored weekly during the induction phase of therapy and monthly during the maintenance phase of therapy.For specific recommendations in chronic hepatitis and chronic hepatitis B, see INDICATIONS AND USAGE.. Standard hematologic tests -- including hemoglobin, complete and differential white blood cell counts, and platelet count.. Blood chemistries -- electrolytes, liver function tests, and TSH.. Monitor hepatic function with serum bilirubin, ALT (alanine transaminase), AST (aspartate aminotransferase), alkaline phosphatase, and LDH (lactate dehydrogenase) at 2, and 12 weeks following initiation of INTRON A, then every months while receiving INTRON A. Permanently discontinue INTRON for evidence of severe (Grade 3) hepatic injury or hepatic decompensation (Child-Pugh score >6 [class and C]).. Carcinogenesis, Mutagenesis, Impairment of Fertility. Studies with INTRON have not been performed to determine carcinogenicity.Interferon may impair fertility. In studies of interferon administration in nonhuman primates, menstrual cycle abnormalities have been observed. Decreases in serum estradiol and progesterone concentrations have been reported in women treated with human leukocyte interferon.12 Therefore, fertile women should not receive INTRON therapy unless they are using effective contraception during the therapy period. INTRON therapy should be used with caution in fertile men.Mutagenicity studies have demonstrated that INTRON is not mutagenic.Studies in mice (0.1, 1.0 million IU/day), rats (4, 20, 100 million IU/kg/day), and cynomolgus monkeys (1.1 million IU/kg/day; 0.25, 0.75, 2.5 million IU/kg/day) injected with INTRON for up to days, months, and month, respectively, have revealed no evidence of toxicity. However, in cynomolgus monkeys (4, 20, 100 million IU/kg/day) injected daily for months with INTRON A, toxicity was observed at the mid and high doses and mortality was observed at the high dose.However, due to the known species-specificity of interferon, the effects in animals are unlikely to be predictive of those in man.INTRON in combination with REBETOL should be used with caution in fertile men. See the REBETOL prescribing information for additional information.. Pregnancy. INTRON has been shown to have abortifacient effects in Macaca mulatta (rhesus monkeys) at 15 and 30 million IU/kg (estimated human equivalent of and 10 million IU/kg, based on body surface area adjustment for 60-kg adult). There are no adequate and well-controlled studies in pregnant women. INTRON therapy should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.. See REBETOL prescribing information for additional information. Significant teratogenic and/or embryocidal effects have been demonstrated in all animal species exposed to ribavirin. REBETOL therapy is contraindicated in women who are pregnant and in the male partners of women who are pregnant. See CONTRAINDICATIONS and the REBETOL prescribing information.. Nursing Mothers. It is not known whether this drug is excreted in human milk. However, studies in mice have shown that mouse interferons are excreted into the milk. Because of the potential for serious adverse reactions from the drug in nursing infants, decision should be made whether to discontinue nursing or to discontinue INTRON therapy, taking into account the importance of the drug to the mother.. Pediatric Use. General. Safety and effectiveness in pediatric patients have not been established for indications other than chronic hepatitis and chronic hepatitis C.. Chronic Hepatitis B. Safety and effectiveness in pediatric patients ranging in age from to 17 years have been established based upon one controlled clinical trial (see CLINICAL PHARMACOLOGY, INDICATIONS AND USAGE, and DOSAGE AND ADMINISTRATION, Chronic Hepatitis Pediatrics).. Chronic Hepatitis C. Safety and effectiveness in pediatric patients ranging in age from to 16 years have been established based upon clinical studies in 118 patients. See REBETOL prescribing information for additional information. Suicidal ideation or attempts occurred more frequently among pediatric patients compared to adult patients (2.4% versus 1%) during treatment and off-therapy follow-up (see WARNINGS, Neuropsychiatric Disorders). During 48-week course of therapy there was decrease in the rate of linear growth (mean percentile assignment decrease of 7%) and decrease in the rate of weight gain (mean percentile assignment decrease of 9%). general reversal of these trends was noted during the 24-week post-treatment period.Long-term data in limited number of patients suggests that combination therapy may induce growth inhibition that results in reduced final adult height in some patients (see ADVERSE REACTIONS, Chronic Hepatitis Pediatrics).. Geriatric Use. In all clinical studies of INTRON A, including studies as monotherapy and in combination with REBETOL (ribavirin USP) Capsules, only small percentage of the subjects were aged 65 and over. These numbers were too few to determine if they respond differently from younger subjects except for the clinical trials of INTRON in combination with REBETOL, where elderly subjects had higher frequency of anemia (67%) than did younger patients (28%).In database consisting of clinical study and postmarketing reports for various indications, cardiovascular adverse events and confusion were reported more frequently in elderly patients receiving INTRON therapy compared to younger patients.In general, INTRON therapy should be administered to elderly patients cautiously, reflecting the greater frequency of decreased hepatic, renal, bone marrow, and/or cardiac function and concomitant disease or other drug therapy. INTRON is known to be substantially excreted by the kidney, and the risk of adverse reactions to INTRON may be greater in patients with impaired renal function. Because elderly patients often have decreased renal function, patients should be carefully monitored during treatment, and dose adjustments made based on symptoms and/or laboratory abnormalities (see CLINICAL PHARMACOLOGY and DOSAGE AND ADMINISTRATION).

GENERAL PRECAUTIONS SECTION.

General. Acute serious hypersensitivity reactions (e.g., urticaria, angioedema, bronchoconstriction, anaphylaxis) have been observed rarely in INTRON(R) A-treated patients; if such an acute reaction develops, the drug should be discontinued immediately and appropriate medical therapy instituted. Transient rashes have occurred in some patients following injection, but have not necessitated treatment interruption.While fever may be related to the flu-like syndrome reported commonly in patients treated with interferon, other causes of persistent fever should be ruled out.There have been reports of interferon, including INTRON A, exacerbating preexisting psoriasis and sarcoidosis as well as development of new sarcoidosis. Therefore, INTRON therapy should be used in these patients only if the potential benefit justifies the potential risk.Variations in dosage, routes of administration, and adverse reactions exist among different brands of interferon. Therefore, do not use different brands of interferon in any single treatment regimen.

GERIATRIC USE SECTION.

Geriatric Use. In all clinical studies of INTRON A, including studies as monotherapy and in combination with REBETOL (ribavirin USP) Capsules, only small percentage of the subjects were aged 65 and over. These numbers were too few to determine if they respond differently from younger subjects except for the clinical trials of INTRON in combination with REBETOL, where elderly subjects had higher frequency of anemia (67%) than did younger patients (28%).In database consisting of clinical study and postmarketing reports for various indications, cardiovascular adverse events and confusion were reported more frequently in elderly patients receiving INTRON therapy compared to younger patients.In general, INTRON therapy should be administered to elderly patients cautiously, reflecting the greater frequency of decreased hepatic, renal, bone marrow, and/or cardiac function and concomitant disease or other drug therapy. INTRON is known to be substantially excreted by the kidney, and the risk of adverse reactions to INTRON may be greater in patients with impaired renal function. Because elderly patients often have decreased renal function, patients should be carefully monitored during treatment, and dose adjustments made based on symptoms and/or laboratory abnormalities (see CLINICAL PHARMACOLOGY and DOSAGE AND ADMINISTRATION).

ADVERSE REACTIONS SECTION.

ADVERSE REACTIONS. General. The adverse experiences listed below were reported to be possibly or probably related to INTRON(R) therapy during clinical trials. Most of these adverse reactions were mild to moderate in severity and were manageable. Some were transient and most diminished with continued therapy.The most frequently reported adverse reactions were flu-like symptoms, particularly fever, headache, chills, myalgia, and fatigue. More severe toxicities are observed generally at higher doses and may be difficult for patients to tolerate.TREATMENT-RELATED ADVERSE EXPERIENCES BY INDICATIONDosing Regimens Percentage (%) of PatientsDash (--) indicates not reported MALIGNANT MELANOMAFOLLICULAR LYMPHOMAHAIRY CELL LEUKEMIACONDYLOMATA ACUMINATAAIDS-RELATED KAPOSIS SARCOMACHRONIC HEPATITIS CPercentages based upon summary of all adverse events during 18 to 24 months of treatment CHRONIC HEPATITIS BAdultsPediatrics20 MIU/m2 Induction (IV) 10 MIU/m2 Maintenance (SC)5 MIU TIW/SC MIU/m2 TIW/SC MIU/lesion30 MIU/m2 TIW/SC 35 MIU QD/SC MIU TIW MIU QD 10 MIU TIW MIU/m2 TIW ADVERSE EXPERIENCEN=143N=135N=145N=352N=74N=29N=183N=101N=78N=116Application-Site Disorders20 injection site inflammation--1--------53---- other (<=5%)burning, injection site bleeding, injection site pain, injection site reaction (5% in chronic hepatitis pediatrics), itchingBlood Disorders (<5%)anemia, anemia hypochromic, granulocytopenia, hemolytic anemia, leukopenia, lymphocytosis, neutropenia (9% in chronic hepatitis C, 14% in chronic hepatitis pediatrics), thrombocytopenia (10% in chronic hepatitis C) (bleeding 8% in malignant melanoma), thrombocytopenia purpuraBody as Whole facial edema--1--<1--10<131<1 weight decrease313<1<15310253 other (<=5%)allergic reaction, cachexia, dehydration, earache, hernia, edema, hypercalcemia, hyperglycemia, hypothermia, inflammation nonspecific, lymphadenitis, lymphadenopathy, mastitis, periorbital edema, poor peripheral circulation, peripheral edema (6% in follicular lymphoma), phlebitis superficial, scrotal/penile edema, thirst, weakness, weight increaseCardiovascular System Disorders (<5%)angina, arrhythmia, atrial fibrillation, bradycardia, cardiac failure, cardiomegaly, cardiomyopathy, coronary artery disorder, extrasystoles, heart valve disorder, hematoma, hypertension (9% in chronic hepatitis C), hypotension, palpitations, phlebitis, postural hypotension, pulmonary embolism, Raynauds disease, tachycardia, thrombosis, varicose veinEndocrine System Disorders (<5%)aggravation of diabetes mellitus, goiter, gynecomastia, hyperglycemia, hyperthyroidism, hypertriglyceridemia, hypothyroidism, virilismFlu-like Symptoms fever81566856475534668694 headache62213947362143614457 chills54--4645------------ myalgia75163944342843594027 fatigue9686118844823756971 increased sweating613824214113 asthenia--637--11--405155 rigors27----301416384230 arthralgia6889--31619815 dizziness23--129724913108 influenza-like symptoms101837--4579265--<1 back pain--1519613-------- dry mouth1219--2228565-- chest pain28<1<112844---- malaise6----145--13963 pain (unspecified)15918333-------- other (<5%)chest pain substernal, hyperthermia, rhinitis, rhinorrheaGastrointestinal System Disorders diarrhea351918218451319812 anorexia6921191384114435343 nausea66242117282119503318 taste alteration24213<157210---- abdominal pain220<51521165423 loose stools--1--<1--1022--2 vomitingVomiting was reported with nausea as single term32621114871027 constipation114<1--11045--2 gingivitis2Includes stomatitis/mucositis ------14--1---- dyspepsia--2--24--7383 other (<5%)abdominal ascites, abdominal distension, colitis, dysphagia, eructation, esophagitis, flatulence, gallstones, gastric ulcer, gastritis, gastroenteritis, gastrointestinal disorder (7% in follicular lymphoma), gastrointestinal hemorrhage, gastrointestinal mucosal discoloration, gingival bleeding, gum hyperplasia, halitosis, hemorrhoids, increased appetite, increased saliva, intestinal disorder, melena, mouth ulceration, mucositis, oral hemorrhage, oral leukoplakia, rectal bleeding after stool, rectal hemorrhage, stomatitis, stomatitis ulcerative, taste loss, tongue disorder, tooth disorderLiver and Biliary System Disorders (<5%)abnormal hepatic function tests, biliary pain, bilirubinemia, hepatitis, increased lactate dehydrogenase, increased transaminases (SGOT/SGPT) (elevated SGOT 63% in malignant melanoma and 24% in follicular lymphoma), jaundice, right upper quadrant pain (15% in chronic hepatitis C), and very rarely, hepatic encephalopathy, hepatic failure, and deathMusculoskeletal System Disorders musculoskeletal pain--18--------219110 other (<5%)arteritis, arthritis, arthritis aggravated, arthrosis, bone disorder, bone pain, carpal tunnel syndrome, hyporeflexia, leg cramps, muscle atrophy, muscle weakness, polyarteritis nodosa, tendinitis, rheumatoid arthritis, spondylitisNervous System and Psychiatric Disorders depression40963928191764 paresthesia131361321563<1 impaired concentration--1--<13143853 amnesiaAmnesia was reported with confusion as single term1<5----14-------- confusion82<5412101----2 hypoesthesia--1<51--10-------- irritability11--------13161222 somnolence12<533--33Predominantly lethargy 1495 anxiety195<11352--3 insomnia54--<133121168 nervousness11--1--323--3 decreased libido11<5------151-- other (<5%)abnormal coordination, abnormal dreaming, abnormal gait, abnormal thinking, aggravated depression, aggressive reaction, agitation (7% in chronic hepatitis pediatrics), alcohol intolerance, apathy, aphasia, ataxia, Bells palsy, CNS dysfunction, coma, convulsions, delirium, dysphonia, emotional lability, extrapyramidal disorder, feeling of ebriety, flushing, hearing disorder, hearing impairment, hot flashes, hyperesthesia, hyperkinesia, hypertonia, hypokinesia, impaired consciousness, labyrinthine disorder, loss of consciousness, manic depression, manic reaction, migraine, neuralgia, neuritis, neuropathy, neurosis, paresis, paroniria, parosmia, personality disorder, polyneuropathy, psychosis, speech disorder, stroke, suicidal ideation, suicide attempt, syncope, tinnitus, tremor, twitching, vertigo (8% in follicular lymphoma)Reproduction System Disorders (<5%)amenorrhea (12% in follicular lymphoma), dysmenorrhea, impotence, leukorrhea, menorrhagia, menstrual irregularity, pelvic pain, penis disorder, sexual dysfunction, uterine bleeding, vaginal drynessResistance Mechanism Disorders moniliasis--1--<1--17-------- herpes simplex12--1--315---- other (<5%)abscess, conjunctivitis, fungal infection, hemophilus, herpes zoster, infection, infection bacterial, infection nonspecific (7% in follicular lymphoma), infection parasitic, otitis media, sepsis, stye, trichomonas, upper respiratory tract infection, viral infection (7% in chronic hepatitis C)Respiratory System Disorders dyspnea1514<1--13435---- coughing613<1----3114--5 pharyngitis28<511313717 sinusitis14------212------ nonproductive coughing27------1401---- nasal congestion17--1--10<14---- other (<=5%)asthma, bronchitis (10% in follicular lymphoma), bronchospasm, cyanosis, epistaxis (7% in chronic hepatitis pediatrics), hemoptysis, hypoventilation, laryngitis, lung fibrosis, pleural effusion, orthopnea, pleural pain, pneumonia, pneumonitis, pneumothorax, rales, respiratory disorder, respiratory insufficiency, sneezing, tonsillitis, tracheitis, wheezingSkin and Appendages Disorders dermatitis1--8------21---- alopecia29238--123128263817 pruritus--101117--9643 rash191325--9105815 dry skin139--91043--<1 other (<5%)abnormal hair texture, acne, cellulitis, cyanosis of the hand, cold and clammy skin, dermatitis lichenoides, eczema, epidermal necrolysis, erythema, erythema nodosum, folliculitis, furunculosis, increased hair growth, lacrimal gland disorder, lacrimation, lipoma, maculopapular rash, melanosis, nail disorders, nonherpetic cold sores, pallor, peripheral ischemia, photosensitivity, pruritus genital, psoriasis, psoriasis aggravated, purpura (5% in chronic hepatitis C), rash erythematous, sebaceous cyst, skin depigmentation, skin discoloration, skin nodule, urticaria, vitiligoUrinary System Disorders (<5%)albumin/protein in urine, cystitis, dysuria, hematuria, incontinence, increased BUN, micturition disorder, micturition frequency, nocturia, polyuria (10% in follicular lymphoma), renal insufficiency, urinary tract infection (5% in chronic hepatitis C)Vision Disorders (<5%)abnormal vision, blurred vision, diplopia, dry eyes, eye pain, nystagmus, photophobia. Hairy Cell Leukemia. The adverse reactions most frequently reported during clinical trials in 145 patients with hairy cell leukemia were the flu-like symptoms of fever (68%), fatigue (61%), and chills (46%).. Malignant Melanoma. The INTRON dose was modified because of adverse events in 65% (n=93) of the patients. INTRON therapy was discontinued because of adverse events in 8% of the patients during induction and 18% of the patients during maintenance. The most frequently reported adverse reaction was fatigue, which was observed in 96% of patients. Other adverse reactions that were recorded in greater than 20% of INTRON A-treated patients included neutropenia (92%), fever (81%), myalgia (75%), anorexia (69%), vomiting/nausea (66%), increased SGOT (63%), headache (62%), chills (54%), depression (40%), diarrhea (35%), alopecia (29%), altered taste sensation (24%), dizziness/vertigo (23%), and anemia (22%).Adverse reactions classified as severe or life threatening (ECOG Toxicity Criteria grade or 4) were recorded in 66% and 14% of INTRON A-treated patients, respectively. Severe adverse reactions recorded in greater than 10% of INTRON A-treated patients included neutropenia/leukopenia (26%), fatigue (23%), fever (18%), myalgia (17%), headache (17%), chills (16%), and increased SGOT (14%). Grade fatigue was recorded in 4% and grade depression was recorded in 2% of INTRON A-treated patients. No other grade AE was reported in more than INTRON A-treated patients. Lethal hepatotoxicity occurred in INTRON A-treated patients early in the clinical trial. No subsequent lethal hepatotoxicities were observed with adequate monitoring of liver function tests (see PRECAUTIONS, Laboratory Tests).. Follicular Lymphoma. Ninety-six percent of patients treated with CHVP plus INTRON therapy and 91% of patients treated with CHVP alone reported an adverse event of any severity. Asthenia, fever, neutropenia, increased hepatic enzymes, alopecia, headache, anorexia, flu-like symptoms, myalgia, dyspnea, thrombocytopenia, paresthesia, and polyuria occurred more frequently in the CHVP plus INTRON A-treated patients than in patients treated with CHVP alone. Adverse reactions classified as severe or life threatening (World Health Organization grade or 4) recorded in greater than 5% of CHVP plus INTRON A-treated patients included neutropenia (34%), asthenia (10%), and vomiting (10%). The incidence of neutropenic infection was 6% in CHVP plus INTRON versus 2% in CHVP alone. One patient in each treatment group required hospitalization.Twenty-eight percent of CHVP plus INTRON A-treated patients had temporary modification/interruption of their INTRON therapy, but only 13 patients (10%) permanently stopped INTRON therapy because of toxicity. There were four deaths on study; two patients committed suicide in the CHVP plus INTRON arm and two patients in the CHVP arm had unwitnessed sudden death. Three patients with hepatitis (one of whom also had alcoholic cirrhosis) developed hepatotoxicity leading to discontinuation of INTRON A. Other reasons for discontinuation included intolerable asthenia (5/135), severe flu symptoms (2/135), and one patient each with exacerbation of ankylosing spondylitis, psychosis, and decreased ejection fraction.. Condylomata Acuminata. Eighty-eight percent (311/352) of patients treated with INTRON for condylomata acuminata who were evaluable for safety reported an adverse reaction during treatment. The incidence of the adverse reactions reported increased when the number of treated lesions increased from one to five. All 40 patients who had five warts treated reported some type of adverse reaction during treatment.Adverse reactions and abnormal laboratory test values reported by patients who were re-treated were qualitatively and quantitatively similar to those reported during the initial INTRON treatment period.. AIDS-Related Kaposis Sarcoma. In patients with AIDS-Related Kaposis Sarcoma, some type of adverse reaction occurred in 100% of the 74 patients treated with 30 million IU/m2 three times week and in 97% of the 29 patients treated with 35 million IU per day.Of these adverse reactions, those classified as severe (World Health Organization grade or 4) were reported in 27% to 55% of patients. Severe adverse reactions in the 30 million IU/m2 TIW study included: fatigue (20%), influenza-like symptoms (15%), anorexia (12%), dry mouth (4%), headache (4%), confusion (3%), fever (3%), myalgia (3%), and nausea and vomiting (1% each). Severe adverse reactions for patients who received the 35 million IU QD included: fever (24%), fatigue (17%), influenza-like symptoms (14%), dyspnea (14%), headache (10%), pharyngitis (7%), and ataxia, confusion, dysphagia, GI hemorrhage, abnormal hepatic function, increased SGOT, myalgia, cardiomyopathy, face edema, depression, emotional lability, suicide attempt, chest pain, and coughing (1 patient each). Overall, the incidence of severe toxicity was higher among patients who received the 35 million IU per day dose.. Chronic Hepatitis C. Adults. Two studies of extended treatment (18-24 months) with INTRON show that approximately 95% of all patients treated experience some type of adverse event and that patients treated for extended duration continue to experience adverse events throughout treatment. Most adverse events reported are mild to moderate in severity. However, 29/152 (19%) of patients treated for 18 to 24 months experienced serious adverse event compared to 11/163 (7%) of those treated for months. Adverse events which occur or persist during extended treatment are similar in type and severity to those occurring during short-course therapy.Of the patients achieving complete response after months of therapy, 12/79 (15%) subsequently discontinued INTRON treatment during extended therapy because of adverse events, and 23/79 (29%) experienced severe adverse events (WHO grade or 4) during extended therapy.In patients using combination treatment with INTRON and REBETOL, the primary toxicity observed was hemolytic anemia. Reductions in hemoglobin levels occurred within the first to weeks of therapy. Cardiac and pulmonary events associated with anemia occurred in approximately 10% of patients treated with INTRON A/REBETOL therapy. See REBETOL prescribing information for additional information.. Chronic Hepatitis C. Pediatrics. In pediatric patients with chronic hepatitis treated with INTRON 3 MIU/m2 three times weekly and REBETOL 15 mg/kg per day, all subjects (n=118) had at least one adverse event during 24-48 weeks of treatment, of which 80% were considered to be mild or moderate in severity. Six percent discontinued therapy due to adverse reactions and dose modifications were required in 30% of subjects, most commonly for anemia and neutropenia. Adverse events occurring in more than 50% of subjects included headache, fever, fatigue and anorexia. Adverse events occurring in 20-50% of subjects included influenza-like symptoms, abdominal pain, vomiting, nausea, myalgia, pharyngitis, diarrhea, viral infection, rigors, weight decrease, musculoskeletal pain, alopecia and dizziness. The most common laboratory test abnormalities were neutropenia (34%) and anemia (27%). Depression was reported in 13% (n=15) of children. Three of these subjects had suicidal ideation, and one attempted suicide. Weight loss and slowed growth are common in pediatric patients during combination therapy with INTRON and REBETOL. Following treatment, rebound growth and weight gain occurred in most subjects. Long-term follow-up data in pediatric subjects, however, indicates that INTRON in combination with REBETOL may induce growth inhibition that results in reduced adult height in some patients (see PRECAUTIONS, Pediatric Use).. Chronic Hepatitis B. Adults. In patients with chronic hepatitis B, some type of adverse reaction occurred in 98% of the 101 patients treated at million IU QD and 90% of the 78 patients treated at 10 million IU TIW. Most of these adverse reactions were mild to moderate in severity, were manageable, and were reversible following the end of therapy.Adverse reactions classified as severe (causing significant interference with normal daily activities or clinical state) were reported in 21% to 44% of patients. The severe adverse reactions reported most frequently were the flu-like symptoms of fever (28%), fatigue (15%), headache (5%), myalgia (4%), rigors (4%), and other severe flu-like symptoms, which occurred in 1% to 3% of patients. Other severe adverse reactions occurring in more than one patient were alopecia (8%), anorexia (6%), depression (3%), nausea (3%), and vomiting (2%).To manage side effects, the dose was reduced, or INTRON therapy was interrupted in 25% to 38% of patients. Five percent of patients discontinued treatment due to adverse experiences.. Chronic Hepatitis B. Pediatrics. In pediatric patients with chronic hepatitis (n=72) during 16-24 weeks of treatment, the most frequently reported adverse events were those commonly associated with interferon treatment: flu-like symptoms (100%), gastrointestinal system disorders (46%), and nausea and vomiting (40%). Neutropenia (13%) and thrombocytopenia (3%) were also reported. None of the adverse events was life threatening and most were moderate to severe and resolved upon dose reduction or drug discontinuation.ABNORMAL LABORATORY TEST VALUES BY INDICATIONDosing Regimens Percentage (%) of PatientsMALIGNANT MELANOMAFOLLICULAR LYMPHOMAHAIRY CELL LEUKEMIACONDYLOMATA ACUMINATAAIDS-RELATED KAPOSIS SARCOMACHRONIC HEPATITIS CCHRONIC HEPATITIS BAdultsPediatrics20 MIU/m2 Induction (IV) 10 MIU/m2 Maintenance (SC)5 MIU TIW/SC MIU/m2 TIW/SC MIU/lesion30 MIU/m2 TIW/SC 35 MIU QD/SC MIU TIW MIU QD 10 MIU TIW MIU/m2 TIW Laboratory TestsN=143N=135N=145N=352N=69-73N=26-28N=140-171N=96-101N=75-103N=113-115NA -- Not Applicable -- Patients initial hematologic laboratory test values were abnormal due to their condition.Hemoglobin228NA--11526Decrease of >=2 g/dL; 20% 2-<3 g/dL; 6% >=3 g/dL 32Decrease of >=2 g/dL 23 17Decrease of >=2 g/dL; 14% 2-<3 g/dL; 3% >=3 g/dL White Blood Cell CountWhite Blood Cell Count was reported as neutropenia--NA17102226Decrease to <3000/mm3 68 34 Platelet Count1513NA--0815Decrease to <70,000/mm3 12 1 Serum Creatinine320------6303Alkaline Phosphatase13--4--------840Lactate Dehydrogenase1--0--------------Serum Urea Nitrogen1240--------202SGOT63244121141--------SGPT2--13--1015--------Granulocyte CountTotal9236NA--313945Neutrophils plus bands 75 61 70 1000-<1500/mm3 66----------32303243750-<1000/mm3 --21--------10241818500-<750/mm3 25----------11797<500/mm3 113--------2422. Total. 1000-<1500/mm3 750-<1000/mm3 500-<750/mm3 <500/mm3 Postmarketing Experience. The following adverse reactions have been identified during postapproval use of INTRON alone or in combination with REBETOL. Because these reactions are reported voluntarily from population of uncertain size, it is not always possible to reliably estimate their frequency or establish causal relationship to drug exposure.Blood and Lymphatic System Disorderspancytopenia (concurrent anemia, leukopenia, thrombocytopenia), aplastic anemia, pure red cell aplasia, thrombotic thrombocytopenic purpura, idiopathic thrombocytopenic purpuraCardiac DisorderspericarditisEar and Labyrinth Disordershearing lossEndocrine DisordershypopituitarismEye DisordersVogt-Koyanagi-Harada syndrome, serous retinal detachmentGastrointestinal Disorderspancreatitis, tongue pigmentationGeneral Disorders and Administration Site Conditionsasthenic conditions (including asthenia, malaise, fatigue)Immune System Disorderscases of acute hypersensitivity reactions, including anaphylaxis and angioedema, systemic lupus erythematosus, sarcoidosis or exacerbation of sarcoidosis Infections and Infestationshepatitis virus reactivation in HCV/HBV co-infected patientsMusculoskeletal and Connective Tissue DisordersmyositisNervous System Disordersperipheral neuropathyPsychiatric Disordershomicidal ideation, psychosis including hallucinationsRenal and Urinary Disordersrenal failure, renal insufficiency, nephrotic syndromeRespiratory, Thoracic, and Mediastinal Disorderspulmonary hypertension, pulmonary fibrosisSkin and Subcutaneous Tissue Disordersinjection site necrosis, Stevens-Johnson syndrome, toxic epidermal necrolysis, erythema multiforme, urticaria.

BOXED WARNING SECTION.

WARNING. Alpha interferons, including INTRON(R) A, cause or aggravate fatal or life-threatening neuropsychiatric, autoimmune, ischemic, and infectious disorders. Patients should be monitored closely with periodic clinical and laboratory evaluations. Patients with persistently severe or worsening signs or symptoms of these conditions should be withdrawn from therapy. In many but not all cases these disorders resolve after stopping INTRON therapy. See WARNINGS and ADVERSE REACTIONS.

CARCINOGENESIS & MUTAGENESIS & IMPAIRMENT OF FERTILITY SECTION.

Carcinogenesis, Mutagenesis, Impairment of Fertility. Studies with INTRON have not been performed to determine carcinogenicity.Interferon may impair fertility. In studies of interferon administration in nonhuman primates, menstrual cycle abnormalities have been observed. Decreases in serum estradiol and progesterone concentrations have been reported in women treated with human leukocyte interferon.12 Therefore, fertile women should not receive INTRON therapy unless they are using effective contraception during the therapy period. INTRON therapy should be used with caution in fertile men.Mutagenicity studies have demonstrated that INTRON is not mutagenic.Studies in mice (0.1, 1.0 million IU/day), rats (4, 20, 100 million IU/kg/day), and cynomolgus monkeys (1.1 million IU/kg/day; 0.25, 0.75, 2.5 million IU/kg/day) injected with INTRON for up to days, months, and month, respectively, have revealed no evidence of toxicity. However, in cynomolgus monkeys (4, 20, 100 million IU/kg/day) injected daily for months with INTRON A, toxicity was observed at the mid and high doses and mortality was observed at the high dose.However, due to the known species-specificity of interferon, the effects in animals are unlikely to be predictive of those in man.INTRON in combination with REBETOL should be used with caution in fertile men. See the REBETOL prescribing information for additional information.

CLINICAL PHARMACOLOGY SECTION.

CLINICAL PHARMACOLOGY. General. The interferons are family of naturally occurring small proteins and glycoproteins with molecular weights of approximately 15,000 to 27,600 daltons produced and secreted by cells in response to viral infections and to synthetic or biological inducers.. Preclinical Pharmacology. Interferons exert their cellular activities by binding to specific membrane receptors on the cell surface. Once bound to the cell membrane, interferons initiate complex sequence of intracellular events. In vitro studies demonstrated that these include the induction of certain enzymes, suppression of cell proliferation, immunomodulating activities such as enhancement of the phagocytic activity of macrophages and augmentation of the specific cytotoxicity of lymphocytes for target cells, and inhibition of virus replication in virus-infected cells.In study using human hepatoblastoma cell line HB 611, the in vitro antiviral activity of alpha interferon was demonstrated by its inhibition of hepatitis virus (HBV) replication.The correlation between these in vitro data and the clinical results is unknown. Any of these activities might contribute to interferons therapeutic effects.. Pharmacokinetics. The pharmacokinetics of INTRON(R) were studied in 12 healthy male volunteers following single doses of million IU/m2 administered intramuscularly, subcutaneously, and as 30-minute intravenous infusion in crossover design.The mean serum INTRON concentrations following intramuscular and subcutaneous injections were comparable. The maximum serum concentrations obtained via these routes were approximately 18 to 116 IU/mL and occurred to 12 hours after administration. The elimination half-life of INTRON following both intramuscular and subcutaneous injections was approximately to hours. Serum concentrations were undetectable by 16 hours after the injections.After intravenous administration, serum INTRON concentrations peaked (135-273 IU/mL) by the end of the 30-minute infusion, then declined at slightly more rapid rate than after intramuscular or subcutaneous drug administration, becoming undetectable hours after the infusion. The elimination half-life was approximately hours.Urine INTRON concentrations following single dose (5 million IU/m2) were not detectable after any of the parenteral routes of administration. This result was expected since preliminary studies with isolated and perfused rabbit kidneys have shown that the kidney may be the main site of interferon catabolism.There are no pharmacokinetic data available for the intralesional route of administration.. Serum Neutralizing Antibodies. In INTRON A-treated patients tested for antibody activity in clinical trials, serum anti-interferon neutralizing antibodies were detected in 0% (0/90) of patients with hairy cell leukemia, 0.8% (2/260) of patients treated intralesionally for condylomata acuminata, and 4% (1/24) of patients with AIDS-Related Kaposis Sarcoma. Serum neutralizing antibodies have been detected in less than 3% of patients treated with higher INTRON doses in malignancies other than hairy cell leukemia or AIDS-Related Kaposis Sarcoma. The clinical significance of the appearance of serum anti-interferon neutralizing activity in these indications is not known.Serum anti-interferon neutralizing antibodies were detected in 7% (12/168) of patients either during treatment or after completing 12 to 48 weeks of treatment with million IU TIW of INTRON therapy for chronic hepatitis and in 13% (6/48) of patients who received INTRON therapy for chronic hepatitis at million IU QD for months, and in 3% (1/33) of patients treated at 10 million IU TIW. Serum anti-interferon neutralizing antibodies were detected in 9% (5/53) of pediatric patients who received INTRON therapy for chronic hepatitis at million IU/m2 TIW. Among all chronic hepatitis or patients, pediatrics and adults with detectable serum neutralizing antibodies, the titers detected were low (22/24 with titers less than or equal to 1:40 and 2/24 with titers less than or equal to 1:160). The appearance of serum anti-interferon neutralizing activity did not appear to affect safety or efficacy.. Hairy Cell Leukemia. In clinical trials in patients with hairy cell leukemia, there was depression of hematopoiesis during the first to months of INTRON treatment, resulting in reduced numbers of circulating red and white blood cells, and platelets. Subsequently, both splenectomized and nonsplenectomized patients achieved substantial and sustained improvements in granulocytes, platelets, and hemoglobin levels in 75% of treated patients and at least some improvement (minor responses) occurred in 90%. INTRON treatment resulted in decrease in bone marrow hypercellularity and hairy cell infiltrates. The hairy cell index (HCI), which represents the percent of bone marrow cellularity times the percent of hairy cell infiltrate, was greater than or equal to 50% at the beginning of the study in 87% of patients. The percentage of patients with such an HCI decreased to 25% after months and to 14% after year. These results indicate that even though hematologic improvement had occurred earlier, prolonged INTRON treatment may be required to obtain maximal reduction in tumor cell infiltrates in the bone marrow.The percentage of patients with hairy cell leukemia who required red blood cell or platelet transfusions decreased significantly during treatment and the percentage of patients with confirmed and serious infections declined as granulocyte counts improved. Reversal of splenomegaly and of clinically significant hypersplenism was demonstrated in some patients.A study was conducted to assess the effects of extended INTRON treatment on duration of response for patients who responded to initial therapy. In this study, 126 responding patients were randomized to receive additional INTRON treatment for months or observation for comparable period, after 12 months of initial INTRON therapy. During this 6-month period, 3% (2/66) of INTRON A-treated patients relapsed compared with 18% (11/60) who were not treated. This represents significant difference in time to relapse in favor of continued INTRON treatment (P=0.006/0.01, Log Rank/Wilcoxon). Since small proportion of the total population had relapsed, median time to relapse could not be estimated in either group. similar pattern in relapses was seen when all randomized treatment, including that beyond months, and available follow-up data were assessed. The 15% (10/66) relapses among INTRON patients occurred over significantly longer period of time than the 40% (24/60) with observation (P=0.0002/0.0001, Log Rank/Wilcoxon). Median time to relapse was estimated, using the Kaplan-Meier method, to be 6.8 months in the observation group but could not be estimated in the INTRON group.Subsequent follow-up with median time of approximately 40 months demonstrated an overall survival of 87.8%. In comparable historical control group followed for 24 months, overall median survival was approximately 40%.. Malignant Melanoma. The safety and efficacy of INTRON was evaluated as adjuvant to surgical treatment in patients with melanoma who were free of disease (post surgery) but at high risk for systemic recurrence. These included patients with lesions of Breslow thickness greater than mm, or patients with lesions of any Breslow thickness with primary or recurrent nodal involvement. In randomized, controlled trial in 280 patients, 143 patients received INTRON therapy at 20 million IU/m2 intravenously five times per week for weeks (induction phase) followed by 10 million IU/m2 subcutaneously three times per week for 48 weeks (maintenance phase). In the clinical trial, the median daily INTRON dose administered to patients was 19.1 million IU/m2 during the induction phase and 9.1 million IU/m2 during the maintenance phase. INTRON therapy was begun less than or equal to 56 days after surgical resection. The remaining 137 patients were observed.INTRON therapy produced significant increase in relapse-free and overall survival. Median time to relapse for the INTRON A-treated patients versus observation patients was 1.72 years versus 0.98 years (P<0.01, stratified Log Rank). The estimated 5-year relapse-free survival rate, using the Kaplan-Meier method, was 37% for INTRON A-treated patients versus 26% for observation patients. Median overall survival time for INTRON A-treated patients versus observation patients was 3.82 years versus 2.78 years (P=0.047, stratified Log Rank). The estimated 5-year overall survival rate, using the Kaplan-Meier method, was 46% for INTRON A-treated patients versus 37% for observation patients.In second study of 642 resected high-risk melanoma patients, subjects were randomized equally to one of three groups: high-dose INTRON therapy for year (same schedule as above), low-dose INTRON therapy for years (3 MU/d TIW SC), and observation. Consistent with the earlier trial, high-dose INTRON therapy demonstrated an improvement in relapse-free survival (3-year estimated RFS 48% versus 41%; median RFS 2.4 versus 1.6 years, P=not significant). Relapse-free survival in the low-dose INTRON arm was similar to that seen in the observation arm. Neither high-dose nor low-dose INTRON therapy showed benefit in overall survival as compared to observation in this study.. Follicular Lymphoma. The safety and efficacy of INTRON in conjunction with CHVP, combination chemotherapy regimen, was evaluated as initial treatment in patients with clinically aggressive, large tumor burden, Stage III/IV follicular Non-Hodgkins Lymphoma. Large tumor burden was defined by the presence of any one of the following: nodal or extranodal tumor mass with diameter of greater than cm; involvement of at least three nodal sites (each with diameter of greater than cm); systemic symptoms; splenomegaly; serous effusion, orbital or epidural involvement; ureteral compression; or leukemia.In randomized, controlled trial, 130 patients received CHVP therapy and 135 patients received CHVP therapy plus INTRON therapy at million IU subcutaneously three times weekly for the duration of 18 months. CHVP chemotherapy consisted of cyclophosphamide 600 mg/m2, doxorubicin 25 mg/m2, and teniposide (VM-26) 60 mg/m2, administered intravenously on Day and prednisone at daily dose of 40 mg/m2 given orally on Days to 5. Treatment consisted of six CHVP cycles administered monthly, followed by an additional six cycles administered every months for year. Patients in both treatment groups received total of 12 CHVP cycles over 18 months.The group receiving the combination of INTRON therapy plus CHVP had significantly longer progression-free survival (2.9 years versus 1.5 years, P=0.0001, Log Rank test). After median follow-up of 6.1 years, the median survival for patients treated with CHVP alone was 5.5 years while median survival for patients treated with CHVP plus INTRON therapy had not been reached (P=0.004, Log Rank test). In three additional published, randomized, controlled studies of the addition of interferon alpha to anthracycline-containing combination chemotherapy regimens,1-3 the addition of interferon alpha was associated with significantly prolonged progression-free survival. Differences in overall survival were not consistently observed.. Condylomata Acuminata. Condylomata acuminata (venereal or genital warts) are associated with infections of the human papilloma virus (HPV). The safety and efficacy of INTRON in the treatment of condylomata acuminata were evaluated in three controlled double-blind clinical trials. In these studies, INTRON doses of million IU per lesion were administered intralesionally three times week (TIW), in less than or equal to lesions per patient for weeks. The patients were observed for up to 16 weeks after completion of the full treatment course.INTRON treatment of condylomata was significantly more effective than placebo, as measured by disappearance of lesions, decreases in lesion size, and by an overall change in disease status. Of 192 INTRON A-treated patients and 206 placebo-treated patients who were evaluable for efficacy at the time of best response during the course of the study, 42% of INTRON patients versus 17% of placebo patients experienced clearing of all treated lesions. Likewise, 24% of INTRON patients versus 8% of placebo patients experienced marked (75% to less than 100%) reduction in lesion size, 18% versus 9% experienced moderate (50% to 75%) reduction in lesion size, 10% versus 42% had slight (less than 50%) reduction in lesion size, 5% versus 24% had no change in lesion size, and 0% versus 1% experienced exacerbation (P<0.001).In one of these studies, 43% (54/125) of patients in whom multiple (less than or equal to 3) lesions were treated experienced complete clearing of all treated lesions during the course of the study. Of these patients, 81% remained cleared 16 weeks after treatment was initiated.Patients who did not achieve total clearing of all their treated lesions had these same lesions treated with second course of therapy. During this second course of treatment, 38% to 67% of patients had clearing of all treated lesions. The overall percentage of patients who had cleared all their treated lesions after two courses of treatment ranged from 57% to 85%.INTRON A-treated lesions showed improvement within to weeks after the start of treatment in the above study; maximal response to INTRON therapy was noted to weeks after initiation of treatment.The response to INTRON therapy was better in patients who had condylomata for shorter durations than in patients with lesions for longer duration.Another study involved 97 patients in whom three lesions were treated with either an intralesional injection of 1.5 million IU of INTRON per lesion followed by topical application of 25% podophyllin, or topical application of 25% podophyllin alone. Treatment was given once week for weeks. The combined treatment of INTRON and podophyllin was shown to be significantly more effective than podophyllin alone, as determined by the number of patients whose lesions cleared. This significant difference in response was evident after the second treatment (Week 3) and continued through weeks post-treatment. At the time of the patients best response, 67% (33/49) of the INTRON A- and podophyllin-treated patients had all three treated lesions clear while 42% (20/48) of the podophyllin-treated patients had all three clear (P=0.003).. AIDS-Related Kaposis Sarcoma. The safety and efficacy of INTRON in the treatment of Kaposis Sarcoma (KS), common manifestation of the Acquired Immune Deficiency Syndrome (AIDS), were evaluated in clinical trials in 144 patients.In one study, INTRON doses of 30 million IU/m2 were administered subcutaneously three times per week (TIW) to patients with AIDS-Related KS. Doses were adjusted for patient tolerance. The average weekly dose delivered in the first weeks was 150 million IU; at the end of 12 weeks this averaged 110 million IU/week; and by 24 weeks averaged 75 million IU/week.Forty-four percent of asymptomatic patients responded versus 7% of symptomatic patients. The median time to response was approximately months and month, respectively, for asymptomatic and symptomatic patients. The median duration of response was approximately months and month, respectively, for the asymptomatic and symptomatic patients. Baseline T4/T8 ratios were 0.46 for responders versus 0.33 for nonresponders.In another study, INTRON doses of 35 million IU were administered subcutaneously, daily (QD), for 12 weeks. Maintenance treatment, with every other day dosing (QOD), was continued for up to year in patients achieving antitumor and antiviral responses. The median time to response was months and the median duration of response was months in the asymptomatic patients.In all studies, the likelihood of response was greatest in patients with relatively intact immune systems as assessed by baseline CD4 counts (interchangeable with T4 counts). Results at doses of 30 million IU/m2 TIW and 35 million IU/QD were subcutaneously similar and are provided together in TABLE 1. This table demonstrates the relationship of response to baseline CD4 count in both asymptomatic and symptomatic patients in the 30 million IU/m2 TIW and the 35 million IU/QD treatment groups.In the 30 million IU study group, 7% (5/72) of patients were complete responders and 22% (16/72) of the patients were partial responders. The 35 million IU study had 13% (3/23 patients) complete responders and 17% (4/23) partial responders.For patients who received 30 million IU TIW, the median survival time was longer in patients with CD4 greater than 200 (30.7 months) than in patients with CD4 less than or equal to 200 (8.9 months). Among responders, the median survival time was 22.6 months versus 9.7 months in nonresponders.. Chronic Hepatitis C. The safety and efficacy of INTRON in the treatment of chronic hepatitis was evaluated in randomized clinical studies in which an INTRON dose of million IU three times week (TIW) was assessed. The initial three studies were placebo-controlled trials that evaluated 6-month (24-week) course of therapy. In each of the three studies, INTRON therapy resulted in reduction in serum alanine aminotransferase (ALT) in greater proportion of patients versus control patients at the end of months of dosing. During the months of follow-up, approximately 50% of the patients who responded maintained their ALT response. combined analysis comparing pretreatment and post-treatment liver biopsies revealed histological improvement in statistically significantly greater proportion of INTRON A-treated patients compared to controls.Two additional studies have investigated longer treatment durations (up to 24 months).5,6 Patients in the two studies to evaluate longer duration of treatment had hepatitis with or without cirrhosis in the absence of decompensated liver disease. Complete response to treatment was defined as normalization of the final two serum ALT levels during the treatment period. sustained response was defined as complete response at the end of the treatment period, with sustained normal ALT values lasting at least months following discontinuation of therapy.In Study 1, all patients were initially treated with INTRON 3 million IU TIW subcutaneously for 24 weeks (run-in-period). Patients who completed the initial 24-week treatment period were then randomly assigned to receive no further treatment, or to receive million IU TIW for an additional 48 weeks. In Study 2, patients who met the entry criteria were randomly assigned to receive INTRON 3 million IU TIW subcutaneously for 24 weeks or to receive INTRON 3 million IU TIW subcutaneously for 96 weeks. In both studies, patient follow-up was variable and some data collection was retrospective.Results show that longer durations of INTRON therapy improved the sustained response rate (see TABLE 2). In patients with complete responses (CR) to INTRON therapy after months of treatment (149/352 [42%]), responses were less often sustained if drug was discontinued (21/70 [30%]) than if it was continued for 18 to 24 months (44/79 [56%]). Of all patients randomized, the sustained response rate in the patients receiving 18 or 24 months of therapy was 22% and 26%, respectively, in the two trials. In patients who did not have CR by months, additional therapy did not result in significantly more responses, since almost all patients who responded to therapy did so within the first 16 weeks of treatment.A subset (less than 50%) of patients from the combined extended dosing studies had liver biopsies performed both before and after INTRON treatment. Improvement in necroinflammatory activity as assessed retrospectively by the Knodell (Study 1) and Scheuer (Study 2) Histology Activity Indices was observed in both studies. higher number of patients (58%, 45/78) improved with extended therapy than with shorter (6 months) therapy (38%, 34/89) in this subset.Combination treatment with INTRON and REBETOL(R) (ribavirin USP) provided significant reduction in virologic load and improved histologic response in adult patients with compensated liver disease who were treatment-naive or had relapsed following therapy with alpha interferon alone; pediatric patients previously untreated with alpha interferon experienced sustained virologic response. See REBETOL prescribing information for additional information.. Chronic Hepatitis B. Adults. The safety and efficacy of INTRON in the treatment of chronic hepatitis were evaluated in three clinical trials in which INTRON doses of 30 to 35 million IU per week were administered subcutaneously (SC), as either million IU daily (QD), or 10 million IU three times week (TIW) for 16 weeks versus no treatment. All patients were 18 years of age or older with compensated liver disease, and had chronic hepatitis virus (HBV) infection (serum HBsAg positive for at least months) and HBV replication (serum HBeAg positive). Patients were also serum HBV-DNA positive, an additional indicator of HBV replication, as measured by research assay.7,8 All patients had elevated serum alanine aminotransferase (ALT) and liver biopsy findings compatible with the diagnosis of chronic hepatitis. Patients with the presence of antibody to human immunodeficiency virus (anti-HIV) or antibody to hepatitis delta virus (anti-HDV) in the serum were excluded from the studies.Virologic response to treatment was defined in these studies as loss of serum markers of HBV replication (HBeAg and HBV DNA). Secondary parameters of response included loss of serum HBsAg, decreases in serum ALT, and improvement in liver histology.In each of two randomized controlled studies, significantly greater proportion of INTRON A-treated patients exhibited virologic response compared with untreated control patients (see TABLE 3). In third study without concurrent control group, similar response rate to INTRON therapy was observed. Pretreatment with prednisone, evaluated in two of the studies, did not improve the response rate and provided no additional benefit.The response to INTRON therapy was durable. No patient responding to INTRON therapy at dose of million IU QD or 10 million IU TIW relapsed during the follow-up period, which ranged from to months after treatment ended. The loss of serum HBeAg and HBV DNA was maintained in 100% of 19 responding patients followed for 3.5 to 36 months after the end of therapy.In proportion of responding patients, loss of HBeAg was followed by the loss of HBsAg. HBsAg was lost in 27% (4/15) of patients who responded to INTRON therapy at dose of million IU QD, and 35% (8/23) of patients who responded to 10 million IU TIW. No untreated control patient lost HBsAg in these studies.In an ongoing study to assess the long-term durability of virologic response, 64 patients responding to INTRON therapy have been followed for 1.1 to 6.6 years after treatment; 95% (61/64) remain serum HBeAg negative, and 49% (30/61) lost serum HBsAg.INTRON therapy resulted in normalization of serum ALT in significantly greater proportion of treated patients compared to untreated patients in each of two controlled studies (see TABLE 4). In third study without concurrent control group, normalization of serum ALT was observed in 50% (12/24) of patients receiving INTRON therapy.Virologic response was associated with reduction in serum ALT to normal or near normal (less than or equal to 1.5 the upper limit of normal) in 87% (13/15) of patients responding to INTRON therapy at million IU QD, and 100% (23/23) of patients responding to 10 million IU TIW.Improvement in liver histology was evaluated in Studies and by comparison of pretreatment and 6-month post-treatment liver biopsies using the semiquantitative Knodell Histology Activity Index.9 No statistically significant difference in liver histology was observed in treated patients compared to control patients in Study 1. Although statistically significant histological improvement from baseline was observed in treated patients in Study (P<=0.01), there was no control group for comparison. Of those patients exhibiting virologic response following treatment with million IU QD or 10 million IU TIW, histological improvement was observed in 85% (17/20) compared to 36% (9/25) of patients who were not virologic responders. The histological improvement was due primarily to decreases in severity of necrosis, degeneration, and inflammation in the periportal, lobular, and portal regions of the liver (Knodell Categories + II III). Continued histological improvement was observed in four responding patients who lost serum HBsAg and were followed to years after the end of INTRON therapy.10 Pediatrics. The safety and efficacy of INTRON in the treatment of chronic hepatitis was evaluated in one randomized controlled trial of 149 patients ranging from year to 17 years of age. Seventy-two patients were treated with million IU/m2 of INTRON therapy administered subcutaneously three times week (TIW) for week; the dose was then escalated to million IU/m2 TIW for minimum of 16 weeks up to 24 weeks. The maximum weekly dosage was 10 million IU TIW. Seventy-seven patients were untreated controls. Study entry and response criteria were identical to those described in the adult patient population.Patients treated with INTRON therapy had better response (loss of HBV DNA and HBeAg at 24 weeks of follow-up) compared to the untreated controls (24% [17/72] versus 10% [8/77] P=0.05). Sixteen of the 17 responders treated with INTRON therapy remained HBV DNA and HBeAg negative and had normal serum ALT 12 to 24 months after completion of treatment. Serum HBsAg became negative in out of 17 patients who responded to INTRON therapy. None of the control patients who had an HBV DNA and HBeAg response became HBsAg negative. At 24 weeks of follow-up, normalization of serum ALT was similar in patients treated with INTRON therapy (17%, 12/72) and in untreated control patients (16%, 12/77). Patients with baseline HBV DNA less than 100 pg/mL were more likely to respond to INTRON therapy than were patients with baseline HBV DNA greater than 100 pg/mL (35% versus 9%, respectively). Patients who contracted hepatitis through maternal vertical transmission had lower response rates than those who contracted the disease by other means (5% versus 31%, respectively). There was no evidence that the effects on HBV DNA and HBeAg were limited to specific subpopulations based on age, gender, or race.TABLE RESPONSE BY BASELINE CD4 COUNTData for CD4, and asymptomatic and symptomatic classification were not available for all patients. IN AIDS-RELATED KS PATIENTS30 million IU/m2 TIW, SC and 35 million IU QD, SCAsymptomaticSymptomaticCD4<2004/14(29%)0/19(0%)200<=CD4<=4006/12(50%)0/5(0%) 58%CD4>4005/7(71%)0/0(0%)TABLE SUSTAINED ALT RESPONSE RATE VERSUS DURATION OF THERAPY IN CHRONIC HEPATITIS PATIENTS INTRON 3 Million IU TIWTreatment GroupIntent-to-treat groups. Number of Patients (%)Study NumberINTRON 3 million IU 24 weeks of treatmentINTRON 3 million IU 72 or 96 weeks of treatmentStudy 1: 72 weeks of treatment; Study 2: 96 weeks of treatment.Difference (Extended -- 24 weeks)(95% CI)Confidence intervals adjusted for multiple comparisons due to treatment arms in the study.ALT response at the end of follow-up112/101 (12%)23/104 (22%)10% (-3, 24)29/67 (13%)21/80 (26%)13% (-4, 30)Combined Studies21/168 (12.5%)44/184 (24%)11.4% (2, 21)ALT response at the end of treatment140/101 (40%)51/104 (49%)--232/67 (48%)35/80 (44%)--TABLE VIROLOGIC RESPONSELoss of HBeAg and HBV DNA by months post-therapy. IN CHRONIC HEPATITIS PATIENTSTreatment GroupPatients pretreated with prednisone not shown. Number of Patients (%)Study NumberINTRON 5 million IU QDINTRON 10 million IU TIWUntreated ControlsPINTRON treatment group versus untreated control. Value17 15/38(39%)----3/42(7%)0.00092----10/24(42%)1/22(5%)0.00538 ----13/24Untreated control patients evaluated after 24-week observation period. subgroup subsequently received INTRON therapy. direct comparison is not applicable (NA). (54%)2/27(7%) NA All Studies15/38(39%)23/48(48%)6/91(7%)--TABLE ALT RESPONSESReduction in serum ALT to normal by months post-therapy. IN CHRONIC HEPATITIS PATIENTSTreatment Group Number of Patients (%)Study NumberINTRON 5 million IU QDINTRON 10 million IU TIWUntreated ControlsPINTRON treatment group versus untreated control. Value116/38(42%)----8/42(19%)0.032----10/24(42%)1/22(5%)0.00343----12/24Untreated control patients evaluated after 24-week observation period. subgroup subsequently received INTRON therapy. direct comparison is not applicable (NA). (50%)2/27(7%) NA All Studies16/38(42%)22/48(46%)11/91(12%)--.

CONTRAINDICATIONS SECTION.

CONTRAINDICATIONS. INTRON(R) is contraindicated in patients with:Hypersensitivity to interferon alpha or any component of the productAutoimmune hepatitisDecompensated liver diseaseINTRON and REBETOL(R) combination therapy is additionally contraindicated in:Patients with hypersensitivity to ribavirin or any other component of the productWomen who are pregnantMen whose female partners are pregnantPatients with hemoglobinopathies (e.g., thalassemia major, sickle cell anemia)Patients with creatinine clearance less than 50 mL/min.See REBETOL prescribing information for additional information.. Hypersensitivity to interferon alpha or any component of the product. Autoimmune hepatitis. Decompensated liver disease. Patients with hypersensitivity to ribavirin or any other component of the product. Women who are pregnant. Men whose female partners are pregnant. Patients with hemoglobinopathies (e.g., thalassemia major, sickle cell anemia). Patients with creatinine clearance less than 50 mL/min.

DESCRIPTION SECTION.

DESCRIPTION. INTRON(R) (Interferon alfa-2b) for intramuscular, subcutaneous, intralesional, or intravenous Injection is purified sterile recombinant interferon product.INTRON recombinant for Injection has been classified as an alpha interferon and is water-soluble protein with molecular weight of 19,271 daltons produced by recombinant DNA techniques. It is obtained from the bacterial fermentation of strain of Escherichia coli bearing genetically engineered plasmid containing an interferon alfa-2b gene from human leukocytes. The fermentation is carried out in defined nutrient medium containing the antibiotic tetracycline hydrochloride at concentration of to 10 mg/L; the presence of this antibiotic is not detectable in the final product. The specific activity of interferon alfa-2b, recombinant is approximately 2.6 108 IU/mg protein as measured by the HPLC assay.Powder for InjectionVial StrengthMillion IUmL DiluentFinal Concentration after Reconstitution million IU/mLEach mL also contains 20 mg glycine, 2.3 mg sodium phosphate dibasic, 0.55 mg sodium phosphate monobasic, and 1.0 mg human albumin. mg INTRON ABased on the specific activity of approximately 2.6 108 IU/mg protein, as measured by HPLC assay. per vialRoute of Administration101100.038IM, SC, IV, IL181180.069IM, SC, IV501500.192IM, SC, IVPrior to administration, the INTRON Powder for Injection is to be reconstituted with the provided Diluent for INTRON (Sterile Water for Injection USP) (see DOSAGE AND ADMINISTRATION). INTRON Powder for Injection is white to cream-colored powder.Solution Vials for InjectionVial StrengthConcentrationEach mL contains 7.5 mg sodium chloride, 1.8 mg sodium phosphate dibasic, 1.3 mg sodium phosphate monobasic, 0.1 mg edetate disodium, 0.1 mg polysorbate 80, and 1.5 mg m-cresol as preservative. mg INTRON ABased on the specific activity of approximately 2.6 108 IU/mg protein as measured by HPLC assay. per vialRoute of Administration18This is multidose vial which contains total of 22.8 million IU of interferon alfa-2b, recombinant per 3.8 mL in order to provide the delivery of six 0.5-mL doses, each containing million IU of INTRON (for label strength of 18 million IU). MIU multidose3 million IU/0.5 mL0.088IM, SC25This is multidose vial which contains total of 32.0 million IU of interferon alfa-2b, recombinant per 3.2 mL in order to provide the delivery of five 0.5-mL doses, each containing million IU of INTRON (for label strength of 25 million IU). MIU multidose5 million IU/0.5 mL0.123IM, SC, ILThese packages do not require reconstitution prior to administration (see DOSAGE AND ADMINISTRATION). INTRON Solution for Injection is clear, colorless solution.

DOSAGE & ADMINISTRATION SECTION.

DOSAGE AND ADMINISTRATION. General. IMPORTANT: INTRON(R) is supplied as 1) Powder for Injection/Reconstitution; 2) Solution for Injection in Vials. Not all dosage forms and strengths are appropriate for some indications. It is important that you carefully read the instructions below for the indication you are treating to ensure you are using an appropriate dosage form and strength.To enhance the tolerability of INTRON A, injections should be administered in the evening when possible.To reduce the incidence of certain adverse reactions, acetaminophen may be administered at the time of injection.The solution should be allowed to come to room temperature before using.. Hairy Cell Leukemia. (see DOSAGE AND ADMINISTRATION, General). Dose. The recommended dose for the treatment of hairy cell leukemia is million IU/m2 administered intramuscularly or subcutaneously times week for up to months. Patients with platelet counts of less than 50,000/mm3 should not be administered INTRON intramuscularly, but instead by subcutaneous administration. Patients who are responding to therapy may benefit from continued treatment.Dosage Forms for This IndicationDosage FormConcentrationRouteFixed DosesPowder 10 MIU (single dose)10 MIU/mLIM, SCN/ASolution 18 MIU multidose6 MIU/mLIM, SCN/ASolution 25 MIU multidose10 MIU/mLIM, SCN/ANOTE: INTRON Powder for Injection does not contain preservative. The vial must be discarded after reconstitution and withdrawal of single dose.. Dose Adjustment. If severe adverse reactions develop, the dosage should be modified (50% reduction) or therapy should be temporarily withheld until the adverse reactions abate and then resume at 50% (1 MIU/m2 TIW).If severe adverse reactions persist or recur following dosage adjustment, INTRON should be permanently discontinued.INTRON should be discontinued for progressive disease or failure to respond after six months of treatment. If severe adverse reactions develop, the dosage should be modified (50% reduction) or therapy should be temporarily withheld until the adverse reactions abate and then resume at 50% (1 MIU/m2 TIW).. If severe adverse reactions persist or recur following dosage adjustment, INTRON should be permanently discontinued.. INTRON should be discontinued for progressive disease or failure to respond after six months of treatment. Malignant Melanoma. (see DOSAGE AND ADMINISTRATION, General)INTRON adjuvant treatment of malignant melanoma is given in two phases, induction and maintenance.. Induction Recommended Dose. The recommended daily dose of INTRON in induction is 20 million IU/m2 as an intravenous infusion, over 20 minutes, consecutive days per week, for weeks (see Dose Adjustment below).Dosage Forms for This IndicationDosage FormConcentrationRoutePowder 10 MIU10 MIU/mLIVPowder 18 MIU18 MIU/mLIVPowder 50 MIU50 MIU/mLIVNOTE: INTRON Solution for Injection in vials is NOT recommended for intravenous administration and should not be used for the induction phase of malignant melanoma.NOTE: INTRON Powder for Injection does not contain preservative. The vial must be discarded after reconstitution and withdrawal of single dose.. Dose Adjustment. NOTE: Regular laboratory testing should be performed to monitor laboratory abnormalities for the purpose of dose modifications (see PRECAUTIONS, Laboratory Tests).INTRON should be withheld for severe adverse reactions, including granulocyte counts greater than 250/mm3 but less than 500/mm3 or SGPT/SGOT greater than 5-10x upper limit of normal, until adverse reactions abate. INTRON treatment should be restarted at 50% of the previous dose.INTRON should be permanently discontinued for:Toxicity that does not abate after withholding INTRON ASevere adverse reactions which recur in patients receiving reduced doses of INTRON AGranulocyte count less than 250/mm3 or SGPT/SGOT of greater than 10x upper limit of normal INTRON should be withheld for severe adverse reactions, including granulocyte counts greater than 250/mm3 but less than 500/mm3 or SGPT/SGOT greater than 5-10x upper limit of normal, until adverse reactions abate. INTRON treatment should be restarted at 50% of the previous dose.. INTRON should be permanently discontinued for:Toxicity that does not abate after withholding INTRON ASevere adverse reactions which recur in patients receiving reduced doses of INTRON AGranulocyte count less than 250/mm3 or SGPT/SGOT of greater than 10x upper limit of normal Toxicity that does not abate after withholding INTRON A. Severe adverse reactions which recur in patients receiving reduced doses of INTRON A. Granulocyte count less than 250/mm3 or SGPT/SGOT of greater than 10x upper limit of normal. Maintenance Recommended Dose. The recommended dose of INTRON for maintenance is 10 million IU/m2 as subcutaneous injection three times per week for 48 weeks (see Dose Adjustment below).Dosage Forms for This IndicationDosage FormConcentrationRouteFixed DosesPowder 10 MIU (single dose)Patients receiving 50% dose reduction only 10 MIU/mLSCN/APowder 18 MIU (single dose)Patients receiving full dose only 18 MIU/mLSCN/ASolution 18 MIU multidose6 MIU/mLSCN/ASolution 25 MIU multidose10 MIU/mLSCN/ANOTE: INTRON Powder for Injection does not contain preservative. The vial must be discarded after reconstitution and withdrawal of single dose.. Dose Adjustment. NOTE: Regular laboratory testing should be performed to monitor laboratory abnormalities for the purpose of dose modifications (see PRECAUTIONS, Laboratory Tests).INTRON should be withheld for severe adverse reactions, including granulocyte counts greater than 250/mm3 but less than 500/mm3 or SGPT/SGOT greater than 5-10x upper limit of normal, until adverse reactions abate. INTRON treatment should be restarted at 50% of the previous dose.INTRON should be permanently discontinued for:Toxicity that does not abate after withholding INTRON ASevere adverse reactions which recur in patients receiving reduced doses of INTRON AGranulocyte count less than 250/mm3 or SGPT/SGOT of greater than 10x upper limit of normal INTRON should be withheld for severe adverse reactions, including granulocyte counts greater than 250/mm3 but less than 500/mm3 or SGPT/SGOT greater than 5-10x upper limit of normal, until adverse reactions abate. INTRON treatment should be restarted at 50% of the previous dose.. INTRON should be permanently discontinued for:Toxicity that does not abate after withholding INTRON ASevere adverse reactions which recur in patients receiving reduced doses of INTRON AGranulocyte count less than 250/mm3 or SGPT/SGOT of greater than 10x upper limit of normal Toxicity that does not abate after withholding INTRON A. Severe adverse reactions which recur in patients receiving reduced doses of INTRON A. Granulocyte count less than 250/mm3 or SGPT/SGOT of greater than 10x upper limit of normal Follicular Lymphoma. (see DOSAGE AND ADMINISTRATION, General . Dose. The recommended dose of INTRON for the treatment of follicular lymphoma is million IU subcutaneously three times per week for up to 18 months in conjunction with anthracycline-containing chemotherapy regimen and following completion of the chemotherapy regimen.Dosage Forms for This IndicationDosage FormConcentrationRouteFixed DosesPowder 10 MIU (single dose)10 MIU/mLSCN/ASolution 18 MIU multidose6 MIU/mLSCN/ASolution 25 MIU multidose10 MIU/mLSCN/ANOTE: INTRON Powder for Injection does not contain preservative. The vial must be discarded after reconstitution and withdrawal of single dose.. Dose Adjustment. Doses of myelosuppressive drugs were reduced by 25% from full-dose CHOP regimen, and cycle length increased by 33% (e.g., from 21 to 28 days) when alpha interferon was added to the regimen.Delay chemotherapy cycle if neutrophil count was less than 1500/mm3 or platelet count was less than 75,000/mm3.INTRON should be permanently discontinued if SGOT exceeds greater than 5x the upper limit of normal or serum creatinine greater than 2.0 mg/dL (see WARNINGS).Administration of INTRON therapy should be withheld for neutrophil count less than 1000/mm3, or platelet count less than 50,000/mm3.INTRON dose should be reduced by 50% (2.5 MIU TIW) for neutrophil count greater than 1000/mm3, but less than 1500/mm3. The INTRON dose may be re-escalated to the starting dose (5 million IU TIW) after resolution of hematologic toxicity (ANC greater than 1500/mm3).. Doses of myelosuppressive drugs were reduced by 25% from full-dose CHOP regimen, and cycle length increased by 33% (e.g., from 21 to 28 days) when alpha interferon was added to the regimen.. Delay chemotherapy cycle if neutrophil count was less than 1500/mm3 or platelet count was less than 75,000/mm3.. INTRON should be permanently discontinued if SGOT exceeds greater than 5x the upper limit of normal or serum creatinine greater than 2.0 mg/dL (see WARNINGS).. Administration of INTRON therapy should be withheld for neutrophil count less than 1000/mm3, or platelet count less than 50,000/mm3.. INTRON dose should be reduced by 50% (2.5 MIU TIW) for neutrophil count greater than 1000/mm3, but less than 1500/mm3. The INTRON dose may be re-escalated to the starting dose (5 million IU TIW) after resolution of hematologic toxicity (ANC greater than 1500/mm3).. Condylomata Acuminata. (see DOSAGE AND ADMINISTRATION, General . Dose. The recommended dose is 1.0 million IU per lesion in maximum of lesions in single course. The lesions should be injected three times weekly on alternate days for weeks. An additional course may be administered at 12 to 16 weeks.Dosage Forms for This IndicationDosage FormConcentrationRoutePowder 10 MIU (single dose)10 MIU/mLILSolution 25 MIU multidose10 MIU/mLILNOTE: INTRON Powder for Injection does not contain preservative. The vial must be discarded after reconstitution and withdrawal of single dose.NOTE: Do not use the following formulations for this indication:the 18 million or 50 million IU Powder for Injectionthe 18 million IU multidose INTRON Solution for Injection. the 18 million or 50 million IU Powder for Injection. the 18 million IU multidose INTRON Solution for Injection. Dose Adjustment. None. Technique for Injection. The injection should be administered intralesionally using Tuberculin or similar syringe and 25- to 30-gauge needle. The needle should be directed at the center of the base of the wart and at an angle almost parallel to the plane of the skin (approximately that in the commonly used PPD test). This will deliver the interferon to the dermal core of the lesion, infiltrating the lesion and causing small wheal. Care should be taken not to go beneath the lesion too deeply; subcutaneous injection should be avoided, since this area is below the base of the lesion. Do not inject too superficially since this will result in possible leakage, infiltrating only the keratinized layer and not the dermal core.. AIDS-Related Kaposis Sarcoma (see DOSAGE AND ADMINISTRATION, General . Dose. The recommended dose of INTRON for Kaposis Sarcoma is 30 million IU/m2/dose administered subcutaneously or intramuscularly three times week until disease progression or maximal response has been achieved after 16 weeks of treatment. Dose reduction is frequently required (see Dose Adjustment below).Dosage Forms for This IndicationDosage FormConcentrationRoutePowder 50 MIU50 MIU/mLIM, SCNOTE: INTRON Solution for Injection in vials should NOT be used for AIDS-Related Kaposis Sarcoma.NOTE: INTRON Powder for Injection does not contain preservative. The vial must be discarded after reconstitution and withdrawal of single dose.. Dose Adjustment. INTRON dose should be reduced by 50% or withheld for severe adverse reactions.INTRON may be resumed at reduced dose if severe adverse reactions abate with interruption of dosing.INTRON should be permanently discontinued if severe adverse reactions persist or if they recur in patients receiving reduced dose.. INTRON dose should be reduced by 50% or withheld for severe adverse reactions.. INTRON may be resumed at reduced dose if severe adverse reactions abate with interruption of dosing.. INTRON should be permanently discontinued if severe adverse reactions persist or if they recur in patients receiving reduced dose.. Chronic Hepatitis C. (see DOSAGE AND ADMINISTRATION, General). Dose. The recommended dose of INTRON for the treatment of chronic hepatitis is million IU three times week (TIW) administered subcutaneously or intramuscularly. In patients tolerating therapy with normalization of ALT at 16 weeks of treatment, INTRON therapy should be extended to 18 to 24 months (72 to 96 weeks) at million IU TIW to improve the sustained response rate (see CLINICAL PHARMACOLOGY, Chronic Hepatitis C). Patients who do not normalize their ALTs or have persistently high levels of HCV RNA after 16 weeks of therapy rarely achieve sustained response with extension of treatment. Consideration should be given to discontinuing these patients from therapy.When INTRON is administered in combination with REBETOL(R), patients with impaired renal function and/or those over the age of 50 should be carefully monitored with respect to the development of anemia. See REBETOL prescribing information for dosing when used in combination with REBETOL for adults and pediatric patients.Dosage Forms for This IndicationDosage FormConcentrationRouteFixed DosesSolution 18 MIU multidose6 MIU/mLIM, SCN/A. Dose Adjustment. If severe adverse reactions develop during INTRON treatment, the dose should be modified (50% reduction) or therapy should be temporarily discontinued until the adverse reactions abate. If intolerance persists after dose adjustment, INTRON therapy should be discontinued.. Chronic Hepatitis Adults. (see DOSAGE AND ADMINISTRATION, General). Dose. The recommended dose of INTRON for the treatment of chronic hepatitis is 30 to 35 million IU per week, administered subcutaneously or intramuscularly, either as million IU daily (QD) or as 10 million IU three times week (TIW) for 16 weeks.Dosage Forms for This IndicationDosage FormConcentrationRouteFixed DosesPowder 10 MIU (single dose)10 MIU/mLIM, SCN/ASolution 25 MIU multidose10 MIU/mLIM, SCN/ANOTE: INTRON Powder for Injection does not contain preservative. The vial must be discarded after reconstitution and withdrawal of single dose.. Adults HCV/HBV co-infection. The safety and efficacy of Intron alone or in combination with boceprevir or ribavirin for the treatment of chronic hepatitis genotype infection in patients co-infected with hepatitis virus (HBV) and HCV have not been studied.. Chronic Hepatitis Pediatrics. (see DOSAGE AND ADMINISTRATION, General). Dose. The recommended dose of INTRON for the treatment of chronic hepatitis is million IU/m2 three times week (TIW) for the first week of therapy followed by dose escalation to million IU/m2 TIW (maximum of 10 million IU TIW) administered subcutaneously for total duration of 16 to 24 weeks.Dosage Forms for This IndicationDosage FormConcentrationRouteFixed DosesPowder 10 MIU (single dose)10 MIU/mLSCN/ASolution 25 MIU multidose10 MIU/mLSCN/ANOTE: INTRON Powder for Injection does not contain preservative. The vial must be discarded after reconstitution and withdrawal of single dose.. Dose Adjustment. If severe adverse reactions or laboratory abnormalities develop during INTRON therapy, the dose should be modified (50% reduction) or discontinued if appropriate, until the adverse reactions abate. If intolerance persists after dose adjustment, INTRON therapy should be discontinued.For patients with decreases in white blood cell, granulocyte or platelet counts, the following guidelines for dose modification should be followed:INTRON DoseWhite Blood Cell CountGranulocyte CountPlatelet CountReduce 50%<1.5 109/L<0.75 109/L<50 109/LPermanently Discontinue<1.0 109/L<0.5 109/L<25 109/LINTRON therapy was resumed at up to 100% of the initial dose when white blood cell, granulocyte, and/or platelet counts returned to normal or baseline values.

DRUG INTERACTIONS SECTION.

Drug Interactions. Interactions between INTRON and other drugs have not been fully evaluated. Caution should be exercised when administering INTRON therapy in combination with other potentially myelosuppressive agents such as zidovudine. Concomitant use of alpha interferon and theophylline decreases theophylline clearance, resulting in 100% increase in serum theophylline levels.

HOW SUPPLIED SECTION.

HOW SUPPLIED. INTRON(R) Powder for Injection. INTRON Powder for Injection, 10 million IU per vial and Diluent for INTRON (Sterile Water for Injection USP) mL per vial; boxes containing INTRON vial and vial of INTRON Diluent (NDC 0085-4350-01).INTRON Powder for Injection, 18 million IU per vial and Diluent for INTRON (Sterile Water for Injection USP) mL per vial; boxes containing vial of INTRON and vial of INTRON Diluent (NDC 0085-4351-01).INTRON Powder for Injection, 50 million IU per vial and Diluent for INTRON (Sterile Water for Injection USP) mL per vial; boxes containing INTRON vial and vial of INTRON Diluent (NDC 0085-4352-01).. INTRON Solution for Injection in Vials. INTRON Solution for Injection, 18 million IU multidose vial (22.8 million IU per 3.8 mL per vial); boxes containing vial of INTRON Solution for Injection (NDC 0085-1168-01).INTRON Solution for Injection, 25 million IU multidose vial (32 million IU per 3.2 mL per vial); boxes containing vial of INTRON Solution for Injection (NDC 0085-1133-01).. Storage. INTRON Powder for Injection/Reconstitution INTRON Powder for Injection should be stored in the refrigerator at to 8C (36-46F). After reconstitution, the solution should be used immediately, but may be stored up to 24 hours at to 8C (36-46F). Throw away any medicine left in the vial after you withdraw dose.INTRON Solution for Injection in Vials INTRON Solution for Injection in vials should be stored in the refrigerator at to 8C (36-46F).INTRON Solution for Injection should not be frozen and should be kept away from heat. Throw away any unused INTRON Solution for Injection remaining in the vial after one month.. INTRON Powder for Injection/Reconstitution INTRON Powder for Injection should be stored in the refrigerator at to 8C (36-46F). After reconstitution, the solution should be used immediately, but may be stored up to 24 hours at to 8C (36-46F). Throw away any medicine left in the vial after you withdraw dose.. INTRON Solution for Injection in Vials INTRON Solution for Injection in vials should be stored in the refrigerator at to 8C (36-46F).INTRON Solution for Injection should not be frozen and should be kept away from heat. Throw away any unused INTRON Solution for Injection remaining in the vial after one month.

INFORMATION FOR PATIENTS SECTION.

Information for Patients. Patients receiving INTRON alone or in combination with REBETOL(R) should be informed of the risks and benefits associated with treatment and should be instructed on proper use of the product. To supplement your discussion with patient, you may wish to provide patients with copy of the MEDICATION GUIDE.Patients should be informed of, and advised to seek medical attention for, symptoms indicative of serious adverse reactions associated with this product. Such adverse reactions may include depression (suicidal ideation), cardiovascular (chest pain), ophthalmologic toxicity (decrease in/or loss of vision), pancreatitis or colitis (severe abdominal pain), and cytopenias (high persistent fevers, bruising, dyspnea). Patients should be advised that some side effects such as fatigue and decreased concentration might interfere with the ability to perform certain tasks. Patients who are taking INTRON in combination with REBETOL must be thoroughly informed of the risks to fetus. Female patients and female partners of male patients must be told to use two forms of birth control during treatment and for six months after therapy is discontinued (see MEDICATION GUIDE).Patients should be advised to remain well hydrated during the initial stages of treatment and that use of an antipyretic may ameliorate some of the flu-like symptoms.If decision is made to allow patient to self-administer INTRON A, they should be instructed, based on their treatment, if they should inject dose of INTRON(R) subcutaneously or intramuscularly. If it is too difficult for them to inject themselves, they should be instructed to ask someone who has been trained to give the injection to them. Patients should be instructed on the importance of site selection for self-administering the injection, as well as the importance on rotating the injection sites. puncture resistant container for the disposal of needles and syringes should be supplied. Patients self-administering INTRON should be instructed on the proper disposal of needles and syringes and cautioned against reuse.Patients should be instructed that the Sterile Water for Injection vial supplied with Intron Powder for Injection contains an excess amount of diluent (5 mL) and only mL should be withdrawn to reconstitute Intron Powder for Injection. The vial of Sterile Water for Injection is intended for single-dose only. Discard the unused portion of sterile water. Do not save or reuse.

LABORATORY TESTS SECTION.

Laboratory Tests. In addition to those tests normally required for monitoring patients, the following laboratory tests are recommended for all patients on INTRON therapy, prior to beginning treatment and then periodically thereafter.Standard hematologic tests -- including hemoglobin, complete and differential white blood cell counts, and platelet count.Blood chemistries -- electrolytes, liver function tests, and TSH.Monitor hepatic function with serum bilirubin, ALT (alanine transaminase), AST (aspartate aminotransferase), alkaline phosphatase, and LDH (lactate dehydrogenase) at 2, and 12 weeks following initiation of INTRON A, then every months while receiving INTRON A. Permanently discontinue INTRON for evidence of severe (Grade 3) hepatic injury or hepatic decompensation (Child-Pugh score >6 [class and C]).Those patients who have preexisting cardiac abnormalities and/or are in advanced stages of cancer should have electrocardiograms taken prior to and during the course of treatment.Mild-to-moderate leukopenia and elevated serum liver enzyme (SGOT) levels have been reported with intralesional administration of INTRON (see ADVERSE REACTIONS); therefore, the monitoring of these laboratory parameters should be considered.Baseline chest X-rays are suggested and should be repeated if clinically indicated.For malignant melanoma patients, differential WBC count and liver function tests should be monitored weekly during the induction phase of therapy and monthly during the maintenance phase of therapy.For specific recommendations in chronic hepatitis and chronic hepatitis B, see INDICATIONS AND USAGE.. Standard hematologic tests -- including hemoglobin, complete and differential white blood cell counts, and platelet count.. Blood chemistries -- electrolytes, liver function tests, and TSH.. Monitor hepatic function with serum bilirubin, ALT (alanine transaminase), AST (aspartate aminotransferase), alkaline phosphatase, and LDH (lactate dehydrogenase) at 2, and 12 weeks following initiation of INTRON A, then every months while receiving INTRON A. Permanently discontinue INTRON for evidence of severe (Grade 3) hepatic injury or hepatic decompensation (Child-Pugh score >6 [class and C]).

NURSING MOTHERS SECTION.

Nursing Mothers. It is not known whether this drug is excreted in human milk. However, studies in mice have shown that mouse interferons are excreted into the milk. Because of the potential for serious adverse reactions from the drug in nursing infants, decision should be made whether to discontinue nursing or to discontinue INTRON therapy, taking into account the importance of the drug to the mother.

OVERDOSAGE SECTION.

OVERDOSAGE. There is limited experience with overdosage. Postmarketing surveillance includes reports of patients receiving single dose as great as 10 times the recommended dose. In general, the primary effects of an overdose are consistent with the effects seen with therapeutic doses of interferon alfa-2b. Hepatic enzyme abnormalities, renal failure, hemorrhage, and myocardial infarction have been reported with single administration overdoses and/or with longer durations of treatment than prescribed (see ADVERSE REACTIONS). Toxic effects after ingestion of interferon alfa-2b are not expected because interferons are poorly absorbed orally. Consultation with poison center is recommended.. Treatment. There is no specific antidote for interferon alfa-2b. Hemodialysis and peritoneal dialysis are not considered effective for treatment of overdose.

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL.

PRINCIPAL DISPLAY PANEL Kit Carton 10 Million IU. NDC 0085-4350-01 Refrigerate Interferon alfa-2b,recombinantIntron(R) APowder for InjectionSingle-Dose Vial10 million IU per vialFor Intramuscular/Subcutaneous/Intravenous/Intralesional Use.Rx onlyMedication Guide for patient enclosed. Dosage and Administration: See package insert.Reconstitute as directed in package insert.Read accompanying directions.Discard unused portion.. PRINCIPAL DISPLAY PANEL Kit Carton 10 Million IU.

PEDIATRIC USE SECTION.

Pediatric Use. General. Safety and effectiveness in pediatric patients have not been established for indications other than chronic hepatitis and chronic hepatitis C.. Chronic Hepatitis B. Safety and effectiveness in pediatric patients ranging in age from to 17 years have been established based upon one controlled clinical trial (see CLINICAL PHARMACOLOGY, INDICATIONS AND USAGE, and DOSAGE AND ADMINISTRATION, Chronic Hepatitis Pediatrics).. Chronic Hepatitis C. Safety and effectiveness in pediatric patients ranging in age from to 16 years have been established based upon clinical studies in 118 patients. See REBETOL prescribing information for additional information. Suicidal ideation or attempts occurred more frequently among pediatric patients compared to adult patients (2.4% versus 1%) during treatment and off-therapy follow-up (see WARNINGS, Neuropsychiatric Disorders). During 48-week course of therapy there was decrease in the rate of linear growth (mean percentile assignment decrease of 7%) and decrease in the rate of weight gain (mean percentile assignment decrease of 9%). general reversal of these trends was noted during the 24-week post-treatment period.Long-term data in limited number of patients suggests that combination therapy may induce growth inhibition that results in reduced final adult height in some patients (see ADVERSE REACTIONS, Chronic Hepatitis Pediatrics).

PHARMACOKINETICS SECTION.

Pharmacokinetics. The pharmacokinetics of INTRON(R) were studied in 12 healthy male volunteers following single doses of million IU/m2 administered intramuscularly, subcutaneously, and as 30-minute intravenous infusion in crossover design.The mean serum INTRON concentrations following intramuscular and subcutaneous injections were comparable. The maximum serum concentrations obtained via these routes were approximately 18 to 116 IU/mL and occurred to 12 hours after administration. The elimination half-life of INTRON following both intramuscular and subcutaneous injections was approximately to hours. Serum concentrations were undetectable by 16 hours after the injections.After intravenous administration, serum INTRON concentrations peaked (135-273 IU/mL) by the end of the 30-minute infusion, then declined at slightly more rapid rate than after intramuscular or subcutaneous drug administration, becoming undetectable hours after the infusion. The elimination half-life was approximately hours.Urine INTRON concentrations following single dose (5 million IU/m2) were not detectable after any of the parenteral routes of administration. This result was expected since preliminary studies with isolated and perfused rabbit kidneys have shown that the kidney may be the main site of interferon catabolism.There are no pharmacokinetic data available for the intralesional route of administration.

REFERENCES SECTION.

References. Smalley R, et al. Engl Med. 1992;327:1336-1341.Aviles A, et al. Leukemia and Lymphoma. 1996;20:495-499.Unterhalt M, et al. Blood. 1996;88(10 Suppl 1):1744A.Schiller J, et al. Biol Response Mod. 1989;8:252-261.Poynard T, et al. Engl Med. 1995;332(22)1457-1462.Lin R, et al. Hepatol. 1995;23:487-496.Perrillo R, et al. Engl Med. 1990;323:295-301.Perez V, et al. Hepatol. 1990;11:S113-S117.Knodell R, et al. Hepatology. 1981;1:431-435.Perrillo R, et al. Ann Intern Med. 1991;115:113-115.Kauppila A, et al. Int Cancer. 1982;29:291-294.. Smalley R, et al. Engl Med. 1992;327:1336-1341.. Aviles A, et al. Leukemia and Lymphoma. 1996;20:495-499.. Unterhalt M, et al. Blood. 1996;88(10 Suppl 1):1744A.. Schiller J, et al. Biol Response Mod. 1989;8:252-261.. Poynard T, et al. Engl Med. 1995;332(22)1457-1462.. Lin R, et al. Hepatol. 1995;23:487-496.. Perrillo R, et al. Engl Med. 1990;323:295-301.. Perez V, et al. Hepatol. 1990;11:S113-S117.. Knodell R, et al. Hepatology. 1981;1:431-435.. Perrillo R, et al. Ann Intern Med. 1991;115:113-115.. Kauppila A, et al. Int Cancer. 1982;29:291-294.

SPL MEDGUIDE SECTION.

This Medication Guide has been approved by the U.S. Food and Drug AdministrationRevised: 08/2019MEDICATION GUIDEINTRON(R) (In-tron-aye) (Interferon alfa-2b, recombinant) If you are taking INTRON with REBETOL, also read the Medication Guide for REBETOL(R) (ribavirin) Capsules and Oral Solution.INTRON alone is treatment for certain types of cancers and hepatitis virus. INTRON by itself or with REBETOL is treatment for some people infected with hepatitis virus.What is the most important information should know about INTRON AINTRON can cause serious side effects that may cause death or worsen certain serious conditions that you may already have.Tell your healthcare provider right away if you have any of the symptoms listed below while taking INTRON A. If symptoms get worse, or become severe and continue, your healthcare provider may tell you to stop taking INTRON permanently. In many, but not all people, these symptoms go away after they stop taking INTRON A.Heart problems. Some people who take INTRON may develop heart problems, including:low blood pressurefast heart rate or abnormal heart beatstrouble breathing or chest painheart attacks or heart muscle problems (cardiomyopathy)Stroke or symptoms of stroke. Symptoms may include weakness, loss of coordination, and numbness. Stroke or symptoms of stroke may happen in people who have some risk factors or no known risk factors for stroke. Mental health problems, including suicide. INTRON may cause you to develop mood or behavior problems that may get worse during treatment with INTRON or after your last dose, including:irritability (getting upset easily)depression (feeling low, feeling bad about yourself, or feeling hopeless) acting aggressive, being angry or violentthoughts of hurting yourself or others, or suicideformer drug addicts may fall back into drug addiction or overdose If you have these symptoms, your healthcare provider should carefully monitor you during treatment with INTRON and for months after your last dose. New or worsening autoimmune disease. Some people taking INTRON develop autoimmune diseases (a condition where the bodys immune cells attack other cells or organs in the body), including rheumatoid arthritis, systemic lupus erythematosus, sarcoidosis, and psoriasis. In some people who already have an autoimmune disease, the disease may get worse while on INTRON A. Infections. Some people who take INTRON may get an infection. Symptoms may include:feverchillsbloody diarrheaburning or pain with urinationurinating oftencoughing up mucus (phlegm) that is colored (for example yellow or pink)During treatment with INTRON A, you should see healthcare provider regularly for check-ups and blood tests to make sure that your treatment is working, and to check for side effects.What is INTRON AINTRON is prescription medicine that is used: to treat adults with blood cancer called hairy cell leukemia to treat certain adults with type of skin cancer called malignant melanomato treat adults with some types of Follicular Non-Hodgkins Lymphoma along with certain chemotherapy medicinesto treat certain adults with genital warts (condylomata acuminata), by injecting the medicine directly into the wartsto treat certain adults with type of cancer caused by AIDS, called AIDS-related Kaposis Sarcomaalone to treat adults with chronic (lasting long time) hepatitis infection with stable liver problemswith REBETOL to treat chronic (lasting long time) hepatitis infection in people years and older with stable liver problemsto treat chronic (lasting long time) hepatitis infection in people year and older with stable liver problemsWho should not take INTRON ADo not take INTRON if you: had serious allergic reaction to another alpha interferon product or are allergic to any of the ingredients in INTRON A. See the end of this Medication Guide for complete list of ingredients. Ask your healthcare provider if you are not sure.have certain types of hepatitis (autoimmune hepatitis)have certain other liver problemsTalk to your healthcare provider before taking INTRON if you have any of these conditions.What should tell my healthcare provider before taking INTRON ABefore you take INTRON A, tell your healthcare provider about all of your health problems, including if you: See What is the most important information should know about INTRON Ahave or ever had any problems with your heart, including heart attack or have high blood pressurehave or ever had bleeding problems or blood clotsare being treated for mental illness or had treatment in the past for any mental illness, including depression and thoughts of hurting yourself or othershave any kind of autoimmune disease (where the bodys immune system attacks the bodys own cells), such as psoriasis, systemic lupus erythematosus, rheumatoid arthritishave or ever had low blood cell countshave ever been addicted to drugs or alcoholhave cirrhosis or other liver problems (other than hepatitis or C)have or had lung problems, such as chronic obstructive pulmonary disease (COPD)have diabeteshave colitis (inflammation of your intestine)have condition that suppresses your immune system, such as cancerhave hepatitis or infectionhave HIV infection (the virus that causes AIDS) have kidney problemshave high blood triglyceride levels (fat in your blood)have an organ transplant and are taking medicine that keeps your body from rejecting your transplant (suppresses your immune system)have any other medical conditionsare pregnant or plan to become pregnant. It is not known if INTRON will harm your unborn baby. You should use effective birth control during treatment with INTRON A. Talk to your healthcare provider about birth control choices for you during treatment with INTRON A. Tell your healthcare provider if you become pregnant during treatment with INTRON A.are breast-feeding or plan to breast-feed. It is not known if INTRON passes into your breast milk. You and your healthcare provider should decide if you will use INTRON or breast-feed. You should not do both. Tell your healthcare provider about all the medicines you take, including prescription and non-prescription medicines, vitamins, and herbal supplements. INTRON and certain other medicines may affect each other and cause side effects. Especially tell your healthcare provider if you take: the anti-hepatitis medicine telbivudine (Tyzeka) the anti-HIV medicine zidovudine (Retrovir) theophylline (Theo-24, Elixophyllin, Uniphyl, Theolair). Your healthcare provider may need to monitor the amount of theophylline in your body and make changes to your theophylline dose. Know the medicines you take. Keep list of them and show it to your healthcare provider and pharmacist when you get new medicine. How should take INTRON ASee the attached Instructions for Use for detailed instructions for preparing and injecting dose of INTRON A.INTRON comes as:a powder for injection in vial that is used only time (single-dose vial). The powder must be mixed with water for injection (a diluent) before you inject it. solution for injection in multi-dose vial. INTRON is given as an injection under the skin (subcutaneous) or into muscle (intramuscular), into genital lesions, or as an injection into vein (intravenous), depending on the condition that is being treated.Your healthcare provider will decide your dose of INTRON and how often you will take it. If your healthcare provider decides that you can inject INTRON for your condition, inject it exactly as prescribed, under your skin (subcutaneous injection) or into your muscle (intramuscular injection). Do not change your dose or how you inject INTRON unless your healthcare provider tells you to.Do not take more than your prescribed dose.Your healthcare provider should show you how to prepare and measure your dose of INTRON and how to inject yourself before you use INTRON for the first time.You should not inject INTRON until your healthcare provider has shown you how to use INTRON the right way.If you miss dose of INTRON A, take the missed dose as soon as possible during the same day or the next day, then continue on your regular dosing schedule. If several days go by after you miss dose, check with your healthcare provider to see what to do. Do not inject more than dose or take more than your prescribed dose without talking to your healthcare provider. If you take too much INTRON A, call your healthcare provider right away. Your healthcare provider may examine you more closely, and do blood tests. Your healthcare provider should do blood tests before you start INTRON A, and regularly during your treatment to see how well the treatment is working, and to check for side effects. What are the possible side effects of INTRON AINTRON may cause serious side effects including:See What is the most important information should know about INTRON ABlood problems. INTRON can affect your bone marrow and cause low white blood cell and platelet counts. In some people, these blood counts may fall to dangerously low levels. If your blood cell counts become very low, you can get infections or have bleeding problems.Serious eye problems. INTRON may cause eye problems that may lead to vision loss or blindness. You should have an eye exam before you start taking INTRON A. If you have eye problems or have had them in the past, you may need eye exams while taking INTRON A. Tell your healthcare provider or eye doctor right away if you have any vision changes while taking INTRON A.Thyroid problems. Some people develop changes in the function of their thyroid. Symptoms of thyroid problems include:problems concentratingfeeling cold or hot all the timechanges in your weightskin changes Blood sugar problems. Some people may develop high blood sugar or diabetes. If you have high blood sugar or diabetes before starting INTRON A, talk to your healthcare provider before you take INTRON A. If you develop high blood sugar or diabetes while taking INTRON A, your healthcare provider may tell you to stop INTRON and prescribe different medicine for you. Symptoms of high blood sugar or diabetes may include:increased thirsttirednessurinating more often than normalincreased appetite weight lossyour breath smells like fruitLung problems including:trouble breathingpneumoniainflammation of lung tissuenew or worse high blood pressure of the lungs (pulmonary hypertension). This can be severe and may lead to death.You may need to have chest X-ray or other tests if you develop fever, cough, shortness of breath, or other symptoms of lung problem during treatment with INTRON A.Severe liver problems, or worsening of liver problems including liver failure and death. Symptoms may include: nausealoss of appetitetirednessdiarrheayellowing of your skin or the white part of your eyesbleeding more easily than normalswelling of your stomach area (abdomen)confusionsleepinessyou cannot be awakened (coma)Serious allergic reactions and skin reactions. Symptoms may include:itchingswelling of your face, eyes, lips, tongue, or throattrouble breathinganxiousnesschest painfeeling faintskin rash, hives, sores in your mouth, or your skin blisters and peelsSwelling of your pancreas (pancreatitis) and intestines (colitis). Symptoms may include:severe stomach area (abdomen) painsevere back painnausea vomiting feverNew or worsening autoimmune disease. Some people taking INTRON develop autoimmune diseases (a condition where the bodys immune cells attack other cells or organs in the body), including rheumatoid arthritis, systemic lupus erythematosus, sarcoidosis, and psoriasis. In some people who already have an autoimmune disease, the disease may worsen while on INTRON A. Nerve problems. People who take INTRON or other alpha interferon products with telbivudine (Tyzeka) can develop nerve problems such as continuing numbness, tingling, or burning sensation in the arms or legs (peripheral neuropathy). Call your healthcare provider if you have any of these symptoms.Growth problems in children. Weight loss and slowed growth are common in children during combination treatment with INTRON and REBETOL. Most children will go through growth spurt and gain weight after treatment stops. Some children may not reach the height that they were expected to have before treatment. Talk to your healthcare provider if you are concerned about your childs growth during treatment with INTRON and REBETOL.Dental and gum problems.Tell your healthcare provider right away if you have any of the symptoms listed above.The most common side effects of INTRON include:Flu-like symptoms. Symptoms may include: headache, muscle aches, tiredness, and fever. Some of these symptoms may be decreased by injecting your INTRON dose in the evening. Talk to your healthcare provider about which over-the-counter medicines you can take to help prevent or decrease some of the symptoms. Tiredness. Many people become very tired during treatment with INTRON A. Appetite problems. Nausea, loss of appetite, and weight loss can happen with INTRON A. Skin reactions. Redness, swelling, and itching are common at the injection site. Hair thinning. Tell your healthcare provider if you have any side effect that bothers you or that does not go away.These are not all the side effects of INTRON A. For more information, ask your healthcare provider or pharmacist.Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.How should store INTRON AINTRON Solution for Injection: Store in the refrigerator between 36F to 46F (2C to 8C).INTRON Solution for Injection in Multidose vials for injection may be used to give more than injection of medicine.Do not freeze.Throw away any unused INTRON Solution for Injection remaining in the vial after one month.INTRON Powder for Injection:Before mixing, store in the refrigerator between 36F to 46F (2C to 8C). After mixing the INTRON Powder for Injection, use the solution right away or store the solution in the refrigerator for up to 24 hours between 36F to 46F (2C to 8C). Throw away any medicine left in the vial after you withdraw dose.Do not freeze. Keep INTRON and all medicines out of the reach of children. General Information about the safe and effective use of INTRON AMedicines are sometimes prescribed for purposes other than those listed in Medication Guide. Do not use INTRON for condition for which it was not prescribed. Do not give INTRON to other people, even if they have the same symptoms that you have. It may harm them.This Medication Guide summarizes the most important information about INTRON A. If you would like more information, ask your healthcare provider. You can ask your healthcare provider or pharmacist for information about INTRON that was written for health care professionals.What are the ingredients in INTRON AActive ingredient: interferon alfa-2b Inactive ingredients: Powder for injection contains: glycine, sodium phosphate dibasic, sodium phosphate monobasic, human albumin. Sterile water for injection is provided as diluent.Solution Multidose vials for injection contain: sodium chloride, sodium phosphate dibasic, sodium phosphate monobasic, edetate disodium, polysorbate 80, and m-cresol as preservative.Manufactured by:Merck Sharp Dohme Corp., subsidiary of Merck Co., Inc., Whitehouse Station, NJ 08889, USAU.S. License Number 0002Copyright (C) 1996-2019 Merck Sharp Dohme Corp., subsidiary of Merck Co., Inc. All rights reserved.usmg-mk2958-mf-1908r014For more information, go to www.IntronA.com or call 1-800-622-4477.. low blood pressure. fast heart rate or abnormal heart beats. trouble breathing or chest pain. heart attacks or heart muscle problems (cardiomyopathy). irritability (getting upset easily). depression (feeling low, feeling bad about yourself, or feeling hopeless) acting aggressive, being angry or violent. thoughts of hurting yourself or others, or suicide. former drug addicts may fall back into drug addiction or overdose fever. chills. bloody diarrhea. burning or pain with urination. urinating often. coughing up mucus (phlegm) that is colored (for example yellow or pink). to treat adults with blood cancer called hairy cell leukemia to treat certain adults with type of skin cancer called malignant melanoma. to treat adults with some types of Follicular Non-Hodgkins Lymphoma along with certain chemotherapy medicines. to treat certain adults with genital warts (condylomata acuminata), by injecting the medicine directly into the warts. to treat certain adults with type of cancer caused by AIDS, called AIDS-related Kaposis Sarcoma. alone to treat adults with chronic (lasting long time) hepatitis infection with stable liver problems. with REBETOL to treat chronic (lasting long time) hepatitis infection in people years and older with stable liver problems. to treat chronic (lasting long time) hepatitis infection in people year and older with stable liver problems. had serious allergic reaction to another alpha interferon product or are allergic to any of the ingredients in INTRON A. See the end of this Medication Guide for complete list of ingredients. Ask your healthcare provider if you are not sure.. have certain types of hepatitis (autoimmune hepatitis). have certain other liver problems. See What is the most important information should know about INTRON A. have or ever had any problems with your heart, including heart attack or have high blood pressure. have or ever had bleeding problems or blood clots. are being treated for mental illness or had treatment in the past for any mental illness, including depression and thoughts of hurting yourself or others. have any kind of autoimmune disease (where the bodys immune system attacks the bodys own cells), such as psoriasis, systemic lupus erythematosus, rheumatoid arthritis. have or ever had low blood cell counts. have ever been addicted to drugs or alcohol. have cirrhosis or other liver problems (other than hepatitis or C). have or had lung problems, such as chronic obstructive pulmonary disease (COPD). have diabetes. have colitis (inflammation of your intestine). have condition that suppresses your immune system, such as cancer. have hepatitis or infection. have HIV infection (the virus that causes AIDS) have kidney problems. have high blood triglyceride levels (fat in your blood). have an organ transplant and are taking medicine that keeps your body from rejecting your transplant (suppresses your immune system). have any other medical conditions. are pregnant or plan to become pregnant. It is not known if INTRON will harm your unborn baby. You should use effective birth control during treatment with INTRON A. Talk to your healthcare provider about birth control choices for you during treatment with INTRON A. Tell your healthcare provider if you become pregnant during treatment with INTRON A.. are breast-feeding or plan to breast-feed. It is not known if INTRON passes into your breast milk. You and your healthcare provider should decide if you will use INTRON or breast-feed. You should not do both.. the anti-hepatitis medicine telbivudine (Tyzeka) the anti-HIV medicine zidovudine (Retrovir) theophylline (Theo-24, Elixophyllin, Uniphyl, Theolair). Your healthcare provider may need to monitor the amount of theophylline in your body and make changes to your theophylline dose. See the attached Instructions for Use for detailed instructions for preparing and injecting dose of INTRON A.. INTRON comes as:a powder for injection in vial that is used only time (single-dose vial). The powder must be mixed with water for injection (a diluent) before you inject it. solution for injection in multi-dose vial. a powder for injection in vial that is used only time (single-dose vial). The powder must be mixed with water for injection (a diluent) before you inject it. a solution for injection in multi-dose vial.. INTRON is given as an injection under the skin (subcutaneous) or into muscle (intramuscular), into genital lesions, or as an injection into vein (intravenous), depending on the condition that is being treated.. Your healthcare provider will decide your dose of INTRON and how often you will take it. If your healthcare provider decides that you can inject INTRON for your condition, inject it exactly as prescribed, under your skin (subcutaneous injection) or into your muscle (intramuscular injection). Do not change your dose or how you inject INTRON unless your healthcare provider tells you to.. Do not take more than your prescribed dose.. Your healthcare provider should show you how to prepare and measure your dose of INTRON and how to inject yourself before you use INTRON for the first time.. You should not inject INTRON until your healthcare provider has shown you how to use INTRON the right way.. If you miss dose of INTRON A, take the missed dose as soon as possible during the same day or the next day, then continue on your regular dosing schedule. If several days go by after you miss dose, check with your healthcare provider to see what to do. Do not inject more than dose or take more than your prescribed dose without talking to your healthcare provider. If you take too much INTRON A, call your healthcare provider right away. Your healthcare provider may examine you more closely, and do blood tests. Your healthcare provider should do blood tests before you start INTRON A, and regularly during your treatment to see how well the treatment is working, and to check for side effects. See What is the most important information should know about INTRON A. Blood problems. INTRON can affect your bone marrow and cause low white blood cell and platelet counts. In some people, these blood counts may fall to dangerously low levels. If your blood cell counts become very low, you can get infections or have bleeding problems.. Serious eye problems. INTRON may cause eye problems that may lead to vision loss or blindness. You should have an eye exam before you start taking INTRON A. If you have eye problems or have had them in the past, you may need eye exams while taking INTRON A. Tell your healthcare provider or eye doctor right away if you have any vision changes while taking INTRON A.. Thyroid problems. Some people develop changes in the function of their thyroid. Symptoms of thyroid problems include:. problems concentrating. feeling cold or hot all the time. changes in your weight. skin changes Blood sugar problems. Some people may develop high blood sugar or diabetes. If you have high blood sugar or diabetes before starting INTRON A, talk to your healthcare provider before you take INTRON A. If you develop high blood sugar or diabetes while taking INTRON A, your healthcare provider may tell you to stop INTRON and prescribe different medicine for you. Symptoms of high blood sugar or diabetes may include:. increased thirst. tiredness. urinating more often than normal. increased appetite weight loss. your breath smells like fruit. Lung problems including:. trouble breathing. pneumonia. inflammation of lung tissue. new or worse high blood pressure of the lungs (pulmonary hypertension). This can be severe and may lead to death.. Severe liver problems, or worsening of liver problems including liver failure and death. Symptoms may include:. nausea. loss of appetite. tiredness. diarrhea. yellowing of your skin or the white part of your eyes. bleeding more easily than normal. swelling of your stomach area (abdomen). confusion. sleepiness. you cannot be awakened (coma). Serious allergic reactions and skin reactions. Symptoms may include:. itching. swelling of your face, eyes, lips, tongue, or throat. trouble breathing. anxiousness. chest pain. feeling faint. skin rash, hives, sores in your mouth, or your skin blisters and peels. Swelling of your pancreas (pancreatitis) and intestines (colitis). Symptoms may include:. severe stomach area (abdomen) pain. severe back pain. nausea vomiting fever. New or worsening autoimmune disease. Some people taking INTRON develop autoimmune diseases (a condition where the bodys immune cells attack other cells or organs in the body), including rheumatoid arthritis, systemic lupus erythematosus, sarcoidosis, and psoriasis. In some people who already have an autoimmune disease, the disease may worsen while on INTRON A. Nerve problems. People who take INTRON or other alpha interferon products with telbivudine (Tyzeka) can develop nerve problems such as continuing numbness, tingling, or burning sensation in the arms or legs (peripheral neuropathy). Call your healthcare provider if you have any of these symptoms.. Growth problems in children. Weight loss and slowed growth are common in children during combination treatment with INTRON and REBETOL. Most children will go through growth spurt and gain weight after treatment stops. Some children may not reach the height that they were expected to have before treatment. Talk to your healthcare provider if you are concerned about your childs growth during treatment with INTRON and REBETOL.. Dental and gum problems.. Flu-like symptoms. Symptoms may include: headache, muscle aches, tiredness, and fever. Some of these symptoms may be decreased by injecting your INTRON dose in the evening. Talk to your healthcare provider about which over-the-counter medicines you can take to help prevent or decrease some of the symptoms. Tiredness. Many people become very tired during treatment with INTRON A. Appetite problems. Nausea, loss of appetite, and weight loss can happen with INTRON A. Skin reactions. Redness, swelling, and itching are common at the injection site. Hair thinning. Store in the refrigerator between 36F to 46F (2C to 8C).. INTRON Solution for Injection in Multidose vials for injection may be used to give more than injection of medicine.. Do not freeze.. Throw away any unused INTRON Solution for Injection remaining in the vial after one month.. After mixing the INTRON Powder for Injection, use the solution right away or store the solution in the refrigerator for up to 24 hours between 36F to 46F (2C to 8C). Throw away any medicine left in the vial after you withdraw dose.. Do not freeze.. Powder for injection contains: glycine, sodium phosphate dibasic, sodium phosphate monobasic, human albumin. Sterile water for injection is provided as diluent.. Solution Multidose vials for injection contain: sodium chloride, sodium phosphate dibasic, sodium phosphate monobasic, edetate disodium, polysorbate 80, and m-cresol as preservative.

SPL UNCLASSIFIED SECTION.

For InjectionPRODUCT INFORMATION.

STORAGE AND HANDLING SECTION.

Storage. INTRON Powder for Injection/Reconstitution INTRON Powder for Injection should be stored in the refrigerator at to 8C (36-46F). After reconstitution, the solution should be used immediately, but may be stored up to 24 hours at to 8C (36-46F). Throw away any medicine left in the vial after you withdraw dose.INTRON Solution for Injection in Vials INTRON Solution for Injection in vials should be stored in the refrigerator at to 8C (36-46F).INTRON Solution for Injection should not be frozen and should be kept away from heat. Throw away any unused INTRON Solution for Injection remaining in the vial after one month.. INTRON Powder for Injection/Reconstitution INTRON Powder for Injection should be stored in the refrigerator at to 8C (36-46F). After reconstitution, the solution should be used immediately, but may be stored up to 24 hours at to 8C (36-46F). Throw away any medicine left in the vial after you withdraw dose.. INTRON Solution for Injection in Vials INTRON Solution for Injection in vials should be stored in the refrigerator at to 8C (36-46F).INTRON Solution for Injection should not be frozen and should be kept away from heat. Throw away any unused INTRON Solution for Injection remaining in the vial after one month.

TERATOGENIC EFFECTS SECTION.

Pregnancy. INTRON has been shown to have abortifacient effects in Macaca mulatta (rhesus monkeys) at 15 and 30 million IU/kg (estimated human equivalent of and 10 million IU/kg, based on body surface area adjustment for 60-kg adult). There are no adequate and well-controlled studies in pregnant women. INTRON therapy should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

WARNINGS SECTION.

WARNINGS. General. Moderate to severe adverse experiences may require modification of the patients dosage regimen, or in some cases termination of INTRON(R) therapy. Because of the fever and other flu-like symptoms associated with INTRON administration, it should be used cautiously in patients with debilitating medical conditions, such as those with history of pulmonary disease (e.g., chronic obstructive pulmonary disease) or diabetes mellitus prone to ketoacidosis. Caution should also be observed in patients with coagulation disorders (e.g., thrombophlebitis, pulmonary embolism) or severe myelosuppression.. Cardiovascular Disorders. INTRON therapy should be used cautiously in patients with history of cardiovascular disease. Those patients with history of myocardial infarction and/or previous or current arrhythmic disorder who require INTRON therapy should be closely monitored (see PRECAUTIONS, Laboratory Tests). Cardiovascular adverse experiences, which include hypotension, arrhythmia, or tachycardia of 150 beats per minute or greater, and rarely, cardiomyopathy and myocardial infarction have been observed in some INTRON A-treated patients. Some patients with these adverse events had no history of cardiovascular disease. Transient cardiomyopathy was reported in approximately 2% of the AIDS-Related Kaposis Sarcoma patients treated with INTRON A. Hypotension may occur during INTRON administration, or up to days post-therapy, and may require supportive therapy including fluid replacement to maintain intravascular volume.Supraventricular arrhythmias occurred rarely and appeared to be correlated with preexisting conditions and prior therapy with cardiotoxic agents. These adverse experiences were controlled by modifying the dose or discontinuing treatment, but may require specific additional therapy.. Cerebrovascular Disorders. Ischemic and hemorrhagic cerebrovascular events have been observed in patients treated with interferon alpha-based therapies, including INTRON A. Events occurred in patients with few or no reported risk factors for stroke, including patients less than 45 years of age. Because these are spontaneous reports, estimates of frequency cannot be made and causal relationship between interferon alpha-based therapies and these events is difficult to establish.. Neuropsychiatric Disorders. DEPRESSION AND SUICIDAL BEHAVIOR INCLUDING SUICIDAL IDEATION, SUICIDAL ATTEMPTS, AND COMPLETED SUICIDES, HOMICIDAL IDEATION, AND AGGRESSIVE BEHAVIOR SOMETIMES DIRECTED TOWARDS OTHERS, HAVE BEEN REPORTED IN ASSOCIATION WITH TREATMENT WITH ALPHA INTERFERONS, INCLUDING INTRON THERAPY. If patients develop psychiatric problems, including clinical depression, it is recommended that the patients be carefully monitored during treatment and in the 6-month follow-up period.INTRON should be used with caution in patients with history of psychiatric disorders. INTRON therapy should be discontinued for any patient developing severe psychiatric disorder during treatment. Obtundation and coma have also been observed in some patients, usually elderly, treated at higher doses. While these effects are usually rapidly reversible upon discontinuation of therapy, full resolution of symptoms has taken up to weeks in few severe episodes. If psychiatric symptoms persist or worsen, or suicidal or homicidal ideation or aggressive behavior towards others is identified, discontinue treatment with INTRON and follow the patient closely, with psychiatric intervention as appropriate. Narcotics, hypnotics, or sedatives may be used concurrently with caution and patients should be closely monitored until the adverse effects have resolved. Suicidal ideation or attempts occurred more frequently among pediatric patients, primarily adolescents, compared to adult patients (2.4% versus 1%) during treatment and off-therapy follow-up. Cases of encephalopathy have also been observed in some patients, usually elderly, treated with higher doses of INTRON A. Treatment with interferons may be associated with exacerbated symptoms of psychiatric disorders in patients with co-occurring psychiatric and substance use disorders. If treatment with interferons is initiated in patients with prior history or existence of psychiatric condition or with history of substance use disorders, treatment considerations should include the need for drug screening and periodic health evaluation, including psychiatric symptom monitoring. Early intervention for re-emergence or development of neuropsychiatric symptoms and substance use is recommended.. Bone Marrow Toxicity. INTRON therapy suppresses bone marrow function and may result in severe cytopenias including aplastic anemia. It is advised that complete blood counts (CBC) be obtained pretreatment and monitored routinely during therapy (see PRECAUTIONS, Laboratory Tests). INTRON therapy should be discontinued in patients who develop severe decreases in neutrophil (less than 0.5 109/L) or platelet counts (less than 25 109/L) (see DOSAGE AND ADMINISTRATION, Guidelines for Dose Modification).. Ophthalmologic Disorders. Decrease or loss of vision, retinopathy including macular edema, retinal artery or vein thrombosis, retinal hemorrhages and cotton wool spots; optic neuritis, papilledema, and serous retinal detachment may be induced or aggravated by treatment with interferon alfa-2b or other alpha interferons. All patients should receive an eye examination at baseline. Patients with preexisting ophthalmologic disorders (e.g., diabetic or hypertensive retinopathy) should receive periodic ophthalmologic exams during interferon alpha treatment. Any patient who develops ocular symptoms should receive prompt and complete eye examination. Interferon alfa-2b treatment should be discontinued in patients who develop new or worsening ophthalmologic disorders.. Endocrine Disorders. Infrequently, patients receiving INTRON therapy developed thyroid abnormalities, either hypothyroid or hyperthyroid. The mechanism by which INTRON may alter thyroid status is unknown. Patients with preexisting thyroid abnormalities whose thyroid function cannot be maintained in the normal range by medication should not be treated with INTRON A. Prior to initiation of INTRON therapy, serum TSH should be evaluated. Patients developing symptoms consistent with possible thyroid dysfunction during the course of INTRON therapy should have their thyroid function evaluated and appropriate treatment instituted. Therapy should be discontinued for patients developing thyroid abnormalities during treatment whose thyroid function cannot be normalized by medication. Discontinuation of INTRON therapy has not always reversed thyroid dysfunction occurring during treatment. Diabetes mellitus has been observed in patients treated with alpha interferons. Patients with these conditions who cannot be effectively treated by medication should not begin INTRON therapy. Patients who develop these conditions during treatment and cannot be controlled with medication should not continue INTRON therapy.. Gastrointestinal Disorders. Hepatotoxicity, including fatality, has been observed in interferon alpha-treated patients, including those treated with INTRON A. INTRON increases the risk of hepatic decompensation and death in patients with cirrhosis. Any patient developing liver function abnormalities during treatment should be monitored closely and if appropriate, treatment should be discontinued.. Pulmonary Disorders. Dyspnea, pulmonary infiltrates, pneumonia, bronchiolitis obliterans, interstitial pneumonitis, pulmonary hypertension, and sarcoidosis, some resulting in respiratory failure and/or patient deaths, may be induced or aggravated by INTRON or other alpha interferons. Recurrence of respiratory failure has been observed with interferon rechallenge. The etiologic explanation for these pulmonary findings has yet to be established. Any patient developing fever, cough, dyspnea, or other respiratory symptoms should have chest X-ray taken. If the chest X-ray shows pulmonary infiltrates or there is evidence of pulmonary function impairment, the patient should be closely monitored, and, if appropriate, interferon alpha treatment should be discontinued. While this has been reported more often in patients with chronic hepatitis treated with interferon alpha, it has also been reported in patients with oncologic diseases treated with interferon alpha.. Autoimmune Disorders. Rare cases of autoimmune diseases including thrombocytopenia, vasculitis, Raynauds phenomenon, rheumatoid arthritis, lupus erythematosus, and rhabdomyolysis have been observed in patients treated with alpha interferons, including patients treated with INTRON A. In very rare cases the event resulted in fatality. The mechanism by which these events developed and their relationship to interferon alpha therapy is not clear. Any patient developing an autoimmune disorder during treatment should be closely monitored and, if appropriate, treatment should be discontinued.. Human Albumin. The powder formulations of this product contain albumin, derivative of human blood. Based on effective donor screening and product manufacturing processes, it carries an extremely remote risk for transmission of viral diseases. theoretical risk for transmission of Creutzfeldt-Jakob disease (CJD) also is considered extremely remote. No cases of transmission of viral diseases or CJD have ever been identified for albumin.. AIDS-Related Kaposis Sarcoma. INTRON therapy should not be used for patients with rapidly progressive visceral disease (see CLINICAL PHARMACOLOGY). Also of note, there may be synergistic adverse effects between INTRON and zidovudine. Patients receiving concomitant zidovudine have had higher incidence of neutropenia than that expected with zidovudine alone. Careful monitoring of the WBC count is indicated in all patients who are myelosuppressed and in all patients receiving other myelosuppressive medications. The effects of INTRON when combined with other drugs used in the treatment of AIDS-related disease are unknown.. Chronic Hepatitis and Chronic Hepatitis B. Patients with decompensated liver disease, autoimmune hepatitis or history of autoimmune disease, and patients who are immunosuppressed transplant recipients should not be treated with INTRON A. There are reports of worsening liver disease, including jaundice, hepatic encephalopathy, hepatic failure, and death following INTRON therapy in such patients. Therapy should be discontinued for any patient developing signs and symptoms of liver failure.Chronic hepatitis patients with evidence of decreasing hepatic synthetic functions, such as decreasing albumin levels or prolongation of prothrombin time, who nevertheless meet the entry criteria to start therapy, may be at increased risk of clinical decompensation if flare of aminotransferases occurs during INTRON treatment. In such patients, if increases in ALT occur during INTRON therapy for chronic hepatitis B, they should be followed carefully, including close monitoring of clinical symptomatology and liver function tests including ALT, prothrombin time, alkaline phosphatase, albumin, and bilirubin. In considering these patients for INTRON therapy, the potential risks must be evaluated against the potential benefits of treatment.. Peripheral Neuropathy. Peripheral neuropathy has been reported when alpha interferons were given in combination with telbivudine. In one clinical trial, an increased risk and severity of peripheral neuropathy was observed with the combination use of telbivudine and pegylated interferon alfa-2a as compared to telbivudine alone. The safety and efficacy of telbivudine in combination with interferons for the treatment of chronic hepatitis has not been demonstrated.. Use with Ribavirin (see also REBETOL(R) prescribing information). REBETOL may cause birth defects and/or death of the unborn child. REBETOL therapy should not be started until report of negative pregnancy test has been obtained immediately prior to planned initiation of therapy. Patients should use at least two forms of contraception and have monthly pregnancy tests (see CONTRAINDICATIONS and PRECAUTIONS, Information for Patients).Combination treatment with INTRON and REBETOL was associated with hemolytic anemia. Hemoglobin less than 10 g/dL was observed in approximately 10% of adult and pediatric patients in clinical trials. Anemia occurred within to weeks of initiation of ribavirin therapy. Combination treatment with INTRON and REBETOL should not be used in patients with creatinine clearance less than 50 mL/min. See REBETOL prescribing information for additional information.