PEDIATRIC USE SECTION.

Pediatric Use. Because of the effects of drugs of the tetracycline-class on tooth development and growth, use doxycycline in pediatric patients years of age or less only when the potential benefits are expected to outweigh the risks in severe or life-threatening conditions (e.g., anthrax, Rocky Mountain spotted fever), particularly when there are no alternative therapies (See WARNINGS and DOSAGE AND ADMINISTRATION).

PRECAUTIONS SECTION.

PRECAUTIONS. General. As with other antibacterial drugs, use of Doxycycline Hyclate Capsules may result in overgrowth of nonsusceptible organisms, including fungi. If superinfection occurs, Doxycycline Hyclate Capsules should be discontinued and appropriate therapy instituted.Incision and drainage or other surgical procedures should be performed in conjunction with antibacterial therapy, when indicated.Doxycycline offers substantial but not complete suppression of the asexual blood stages of Plasmodium strains. Doxycycline does not suppress P. falciparums sexual blood stage gametocytes. Subjects completing this prophylactic regimen may still transmit the infection to mosquitoes outside endemic areas.Prescribing Doxycycline Hyclate Capsules in the absence of proven or strongly suspected bacterial infection or prophylactic indication is unlikely to provide benefit to the patient and increases the risk of the development of drug-resistant bacteria.. Information for Patients. Patients taking doxycycline for malaria prophylaxis should be advised:othat no present-day antimalarial agent, including doxycycline, guarantees protection against malaria.oto avoid being bitten by mosquitoes by using personal protective measures that help avoid contact with mosquitoes, especially from dusk to dawn (e.g., staying in well-screened areas, using mosquito nets, covering the body with clothing, and using an effective insect repellent).othat doxycycline prophylaxis:oshould begin to days before travel to the malarious area,oshould be continued daily while in the malarious area and after leaving the malarious area,oshould be continued for further weeks to avoid development of malaria after returning from an endemic area,oshould not exceed months.All patients taking doxycycline should be advised:oto avoid excessive sunlight or artificial ultraviolet light while receiving doxycycline and to discontinue therapy if phototoxicity (e.g., skin eruption, etc.) occurs. Sunscreen or sunblock should be considered (See WARNINGS). oto drink fluids liberally along with doxycycline to reduce the risk of esophageal irritation and ulceration (See ADVERSE REACTIONS).othat the absorption of tetracyclines is reduced when taken with foods, especially those which contain calcium. However, the absorption of doxycycline is not markedly influenced by simultaneous ingestion of food or milk (See Drug Interactions).othat the absorption of tetracyclines is reduced when taking bismuth subsalicylate (See Drug Interactions).othat the use of doxycycline might increase the incidence of vaginal candidiasis.Patients should be counseled that antibacterial drugs, including Doxycycline Hyclate Capsules should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When Doxycycline Hyclate Capsules are prescribed to treat bacterial infection, patients should be told that although it is common to feel better early in the course of therapy, the medication should be taken exactly as directed. Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by Doxycycline Hyclate Capsules or other antibacterial drugs in the future.Diarrhea is common problem caused by antibacterial drugs, which usually ends when the antibacterials are discontinued. Sometimes after starting treatment with antibacterial drugs, patients can develop watery and bloody stools (with or without stomach cramps and fever) even as late as two or more months after having taken the last dose of the antibacterial drug. If this occurs, patients should contact their physician as soon as possible.. othat no present-day antimalarial agent, including doxycycline, guarantees protection against malaria.. oto avoid being bitten by mosquitoes by using personal protective measures that help avoid contact with mosquitoes, especially from dusk to dawn (e.g., staying in well-screened areas, using mosquito nets, covering the body with clothing, and using an effective insect repellent).. othat doxycycline prophylaxis:oshould begin to days before travel to the malarious area,oshould be continued daily while in the malarious area and after leaving the malarious area,oshould be continued for further weeks to avoid development of malaria after returning from an endemic area,oshould not exceed months.. oshould begin to days before travel to the malarious area,. oshould be continued daily while in the malarious area and after leaving the malarious area,. oshould be continued for further weeks to avoid development of malaria after returning from an endemic area,. oshould not exceed months.. oto avoid excessive sunlight or artificial ultraviolet light while receiving doxycycline and to discontinue therapy if phototoxicity (e.g., skin eruption, etc.) occurs. Sunscreen or sunblock should be considered (See WARNINGS). oto drink fluids liberally along with doxycycline to reduce the risk of esophageal irritation and ulceration (See ADVERSE REACTIONS).. othat the absorption of tetracyclines is reduced when taken with foods, especially those which contain calcium. However, the absorption of doxycycline is not markedly influenced by simultaneous ingestion of food or milk (See Drug Interactions).. othat the absorption of tetracyclines is reduced when taking bismuth subsalicylate (See Drug Interactions).. othat the use of doxycycline might increase the incidence of vaginal candidiasis.. Laboratory Tests. In venereal disease, when co-existent syphilis is suspected, dark field examinations should be done before treatment is started and the blood serology repeated monthly for at least months.In long-term therapy, periodic laboratory evaluation of organ systems, including hematopoietic, renal, and hepatic studies, should be performed.. Drug Interactions. Because tetracyclines have been shown to depress plasma prothrombin activity, patients who are on anticoagulant therapy may require downward adjustment of their anticoagulant dosage.Since bacteriostatic drugs may interfere with the bactericidal action of penicillin, it is advisable to avoid giving tetracyclines in conjunction with penicillin.Absorption of tetracyclines is impaired by antacids containing aluminum, calcium, or magnesium, and iron-containing preparations.Absorption of tetracyclines is impaired by bismuth subsalicylate.Barbiturates, carbamazepine, and phenytoin decrease the half-life of doxycycline.The concurrent use of tetracycline and Penthrane(R) (methoxyflurane) has been reported to result in fatal renal toxicity. Concurrent use of tetracycline may render oral contraceptives less effective.. Drug/Laboratory Test Interactions. False elevations of urinary catecholamine levels may occur due to interference with the fluorescence test.. Carcinogenesis, Mutagenesis, Impairment of Fertility. Long-term studies in animals to evaluate carcinogenic potential of doxycycline have not been conducted. However, there has been evidence of oncogenic activity in rats in studies with the related antibacterial drugs, oxytetracycline (adrenal and pituitary tumors), and minocycline (thyroid tumors).Likewise, although mutagenicity studies of doxycycline have not been conducted, positive results in in vitro mammalian cell assays have been reported for related antibacterial drugs (tetracycline, oxytetracycline).Doxycycline administered orally at dosage levels as high as 250 mg/kg/day had no apparent effect on the fertility of female rats. Effect on male fertility has not been studied.. Pregnancy. Teratogenic EffectsThere are no adequate and well-controlled studies on the use of doxycycline in pregnant women. The vast majority of reported experience with doxycycline during human pregnancy is short-term, first trimester exposure. There are no human data available to assess the effects of long-term therapy of doxycycline in pregnant women, such as that proposed for treatment of anthrax exposure. An expert review of published data on experiences with doxycycline use during pregnancy by TERIS the Teratogen Information System concluded that therapeutic doses during pregnancy are unlikely to pose substantial teratogenic risk (the quantity and quality of data were assessed as limited to fair), but the data are insufficient to state that there is no risk.1 case-control study (18,515 mothers of infants with congenital anomalies and 32,804 mothers of infants with no congenital anomalies) shows weak but marginally statistically significant association with total malformations and use of doxycycline anytime during pregnancy. Sixty-three (0.19%) of the controls and fifty-six (0.30%) of the cases were treated with doxycycline. This association was not seen when the analysis was confined to maternal treatment during the period of organogenesis (i.e., in the second and third months of gestation) with the exception of marginal relationship with neural tube defect based on only two exposed cases. A small prospective study of 81 pregnancies describes 43 pregnant women treated for 10 days with doxycycline during early first trimester. All mothers reported their exposed infants were normal at year of age.3 Nonteratogenic Effects. (See WARNINGS.) Labor and Delivery. The effect of tetracyclines on labor and delivery is unknown.. Nursing Mothers. Tetracyclines are excreted in human milk; however, the extent of absorption of tetracyclines, including doxycycline, by the breastfed infant is not known. Short-term use by lactating women is not necessarily contraindicated; however, the effects of prolonged exposure to doxycycline in breast milk are unknown.4 Because of the potential for serious adverse reactions in nursing infants from doxycycline, decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother (See WARNINGS).. Pediatric Use. Because of the effects of drugs of the tetracycline-class on tooth development and growth, use doxycycline in pediatric patients years of age or less only when the potential benefits are expected to outweigh the risks in severe or life-threatening conditions (e.g., anthrax, Rocky Mountain spotted fever), particularly when there are no alternative therapies (See WARNINGS and DOSAGE AND ADMINISTRATION).

ADVERSE REACTIONS SECTION.

ADVERSE REACTIONS. Due to oral doxycyclines virtually complete absorption, side effects of the lower bowel, particularly diarrhea, have been infrequent. The following adverse reactions have been observed in patients receiving tetracyclines:Gastrointestinal: anorexia, nausea, vomiting, diarrhea, glossitis, dysphagia, enterocolitis, inflammatory lesions (with monilial overgrowth) in the anogenital region, and pancreatitis. Hepatotoxicity has been reported rarely. These reactions have been caused by both the oral and parenteral administration of tetracyclines. Superficial discoloration of the adult permanent dentition, reversible upon drug discontinuation and professional dental cleaning has been reported. Permanent tooth discoloration and enamel hypoplasia may occur with drugs of the tetracycline class when used during tooth development (See WARNINGS). Rare instances of esophagitis and esophageal ulcerations have been reported in patients receiving capsule and tablet forms of the drugs in the tetracycline class. Most of these patients took medications immediately before going to bed (See DOSAGE AND ADMINISTRATION).Skin: toxic epidermal necrolysis, Stevens-Johnson syndrome, erythema multiforme, skin hyperpigmentation, maculopapular and erythematous rashes. Exfoliative dermatitis has been reported but is uncommon. Photosensitivity is discussed above (See WARNINGS).Renal toxicity: Rise in BUN has been reported and is apparently dose related (See WARNINGS).Immune: Hypersensitivity reactions including urticaria, angioneurotic edema, anaphylaxis, anaphylactoid purpura, serum sickness, pericarditis, exacerbation of systemic lupus erythematosus, drug reaction with eosinophilia and systemic symptoms (DRESS), and Jarisch-Herxheimer reaction has been reported in the setting of spirochete infections treated with doxycycline. Blood: Hemolytic anemia, thrombocytopenia, neutropenia, and eosinophilia have been reported.Other: Bulging fontanels in infants and intracranial hypertension in adults (See WARNINGS).When given over prolonged periods, tetracyclines have been reported to produce brown-black microscopic discoloration of the thyroid gland. No abnormalities of thyroid function studies are known to occur.To report SUSPECTED ADVERSE REACTIONS, contact West-Ward Pharmaceuticals Corp. at 1-800-962-8364, or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

CARCINOGENESIS & MUTAGENESIS & IMPAIRMENT OF FERTILITY SECTION.

Carcinogenesis, Mutagenesis, Impairment of Fertility. Long-term studies in animals to evaluate carcinogenic potential of doxycycline have not been conducted. However, there has been evidence of oncogenic activity in rats in studies with the related antibacterial drugs, oxytetracycline (adrenal and pituitary tumors), and minocycline (thyroid tumors).Likewise, although mutagenicity studies of doxycycline have not been conducted, positive results in in vitro mammalian cell assays have been reported for related antibacterial drugs (tetracycline, oxytetracycline).Doxycycline administered orally at dosage levels as high as 250 mg/kg/day had no apparent effect on the fertility of female rats. Effect on male fertility has not been studied.

CLINICAL PHARMACOLOGY SECTION.

CLINICAL PHARMACOLOGY. Tetracyclines are readily absorbed and are bound to plasma proteins in varying degree. They are concentrated by the liver in the bile and excreted in the urine and feces at high concentrations and in biologically active form. Doxycycline is virtually completely absorbed after oral administration.Following 200 mg dose, normal adult volunteers averaged peak serum levels of 2.6 mcg/mL of doxycycline at hours, decreasing to 1.45 mcg/mL at 24 hours. Excretion of doxycycline by the kidney is about 40% per 72 hours in individuals with normal function (creatinine clearance about 75 mL/min). This percentage excretion may fall as low as to 5% per 72 hours in individuals with severe renal insufficiency (creatinine clearance below 10 mL/min). Studies have shown no significant difference in serum half-life of doxycycline (range 18 to 22 hours) in individuals with normal and severely impaired renal function.Hemodialysis does not alter serum half-life.Results of animal studies indicate that tetracyclines cross the placenta and are found in fetal tissues.Population pharmacokinetic analysis of sparse concentration-time data of doxycycline following standard of care intravenous and oral dosing in 44 pediatric patients (2-18 years of age) showed that allometrically -scaled clearance (CL) of doxycycline in pediatric patients >=2 to <=8 years of age (median [range] 3.58 [2.27-10.82] L/h/70 kg, =11) did not differ significantly from pediatric patients >8 to 18 years of age (3 .27 [1.11-8.12] L/h/70 kg, N=33). For pediatric patients weighing <=45 kg, body weight normalized doxycycline CL in those >=2 to <=8 years of age (median [range] 0.071 [0 .041-0.202] L/kg/h, N=10) did not differ significantly from those >8 to 18 years of age (0.081 [0.035-0.126] L/kg/h, N=8). In pediatric patients weighing >45 kg, no clinically significant differences in body weight normalized doxycycline CL were observed between those >=2 to <=8 years (0.050 L/kg/h, N=l) and those >8 to 18 years of age (0.044 [0.014-0.121] L/kg/h, N=25). No clinically significant difference in CL between oral and IV dosing was observed in the small cohort of pediatric patients who received the oral (N=19) or IV (N=2l) formulation alone.. Microbiology Mechanism of ActionDoxycycline inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit. Doxycycline has bacteriostatic activity against broad range of Gram-positive and Gram-negative bacteria. Resistance Cross resistance with other tetracyclines is common.Antimicrobial Activity Doxycycline has been shown to be active against most isolates of the following microorganisms, both in vitro and in clinical infections as described in the INDICATIONS AND USAGE section of the package insert for Doxycycline Hyclate Capsules. Gram-Negative Bacteria Acinetobacter speciesBartonella bacilliformisBrucella speciesKlebsiella speciesKlebsiella granulomatisCampylobacter fetusEnterobacter aerogenesEscherichia coliFrancisella tularensis Haemophilus ducreyi Haemophilus influenzaeNeisseria gonorrhoeaeShigella speciesVibrio choleraeYersinia pestis Gram-Positive Bacteria Bacillus anthracisListeria monocytogenesStreptococcus pneumoniaeAnaerobic BacteriaClostridium speciesFusobacterium fusiformePropionibacterium acnesOther Bacteria Nocardiae and other aerobic Actinomyces speciesBorrelia recurrentisChlamydophila psittaciChlamydia trachomatisMycoplasma pneumoniae Rickettsiae Treponema pallidumTreponema pallidum subspecies pertenueUreaplasma urealyticumParasites Balantidium coliEntamoeba speciesPlasmodium falciparumDoxycycline has been found to be active against the asexual erythrocytic forms of Plasmodium falciparum, but not against the gametocytes of P. falciparum. The precise mechanism of action of the drug is not known.Susceptibility Testing For specific information regarding susceptibility test interpretive criteria and associated test methods and quality control standards recognized by FDA for this drug, please see: https://www.fda.gov/STIC.

CONTRAINDICATIONS SECTION.

CONTRAINDICATIONS. This drug is contraindicated in persons who have shown hypersensitivity to any of the tetracyclines.

DESCRIPTION SECTION.

DESCRIPTION. Doxycycline Hyclate Capsules, USP are an antibacterial drug synthetically derived from oxytetracycline. The structural formula of doxycycline hyclate is:with molecular formula of C22H24N2O8oHCLo1/2C2N5OHo1/2H2O and molecular weight of 512.93.The chemical designation for doxycycline is 2-Naphthacemecarboxamide, 4-(dimethylamino)-1, 4, 4a, 5, 5a, 6, -11, 12a-octahydro-3,5,10, 12, 12a-pentahydroxy-6-mothyl-1, 11-dioxo-monohydrochloride, compound with ethanol(2:1), monohydrate, [4s-(4, 4a, 5, 5a, 6, 12a)]. Doxycycline is light yellow crystalline powder. Doxycycline hyclate is soluble in water. Doxycycline has high degree of lipoid solubility and low affinity for calcium binding. It is highly stable in normal human serum. Doxycycline will not degrade into an epianhydro form.Each capsule for oral administration contains doxycycline hyclate equivalent to 50 mg or 100 mg of doxycycline (anhydrous). Inactive ingredients: lactose monohydrate, microcrystalline cellulose, magnesium stearate.The 50 mg and 100 mg capsule shells contain: gelatin, FD&C Blue and titanium dioxide. The printing ink may contain: Shellac Glaze, Iron Oxide Black, N-Butyl Alcohol, Propylene Glycol, SD-45 Alcohol, FD&C Blue 2, FD&C Red 40, FD&C Blue 1, D&C Yellow 10.. image-doxy-hyclate-structure.jpg.

DOSAGE & ADMINISTRATION SECTION.

DOSAGE AND ADMINISTRATION. The usual dosage and frequency of administration of doxycycline differs from that of the other tetracyclines. Exceeding the recommended dosage may result in an increased incidence of side effects. Adults:The usual dose of oral doxycycline is 200 mg on the first day of treatment (administered 100 mg every 12 hours) followed by maintenance dose of 100 mg/day. In the management of more severe infections (particularly chronic infections of the urinary tract), 100 mg every 12 hours is recommended.Pediatric Patients:For all pediatric patients weighing less than 45 kg with severe or life-threatening infections (e.g., anthrax, Rocky Mountain spotted fever), the recommended dosage is 2.2 mg/kg of body weight administered every 12 hours. Children weighing 45 kg or more should receive the adult dose (See WARNINGS and PRECAUTIONS).For pediatric patients with less severe disease (greater than years of age and weighing less than 45 kg), the recommended dosage schedule is 4.4 mg/kg of body weight divided into two doses on the first day of treatment, followed by maintenance dose of 2.2 mg/kg of body weight (given as single daily dose or divided into twice daily doses). For pediatric patients weighing over 45 kg, the usual adult dose should be used.The therapeutic antibacterial serum activity will usually persist for 24 hours following recommended dosage.When used in streptococcal infections, therapy should be continued for 10 days.Administration of adequate amounts of fluid along with capsule and tablet forms of drugs in the tetracycline class is recommended to wash down the drugs and reduce the risk of esophageal irritation and ulceration (See ADVERSE REACTIONS).If gastric irritation occurs, it is recommended that doxycycline be given with food or milk. The absorption of doxycycline is not markedly influenced by simultaneous ingestion of food or milk.Studies to date have indicated that administration of doxycycline at the usual recommended doses does not lead to excessive accumulation of doxycycline in patients with renal impairment.Uncomplicated gonococcal infections in adults (except anorectal infections in men): 100 mg, by mouth, twice day for days. As an alternate single visit dose, administer 300 mg stat followed in one hour by second 300 mg dose. The dose may be administered with food, including milk or carbonated beverage, as required.Uncomplicated urethral, endocervical, or rectal infection in adults caused by Chlamydia trachomatis: 100 mg, by mouth twice day for days.Nongonococcal urethritis (NGU) caused by C. trachomatis or U. urealyticum: 100 mg by mouth, twice day for days.Syphilis early: Patients who are allergic to penicillin should be treated with doxycycline 100 mg, by mouth, twice day for weeks.Syphilis of more than one years duration: Patients who are allergic to penicillin should be treated with doxycycline 100 mg, by mouth, twice day for weeks.Acute epididymo-orchitis caused by N. gonorrhoeae: 100 mg, by mouth, twice day for at least 10 days.Acute epididymo-orchitis caused by C. trachomatis: 100 mg, by mouth, twice day for at least 10 days.For prophylaxis of malaria: For adults, the recommended dose is 100 mg daily. For children over years of age, the recommended dose is mg/kg given once daily up to the adult dose. Prophylaxis should begin to days before travel to the malarious area. Prophylaxis should be continued daily during travel in the malarious area and for weeks after the traveler leaves the malarious area.Inhalational anthrax (post-exposure):ADULTS: 100 mg of doxycycline, by mouth, twice day for 60 days.CHILDREN: weighing less than 45 kg; 2.2 mg/kg of body weight by mouth, twice day for 60 days. Children weighing 45 kg or more should receive the adult dose.

DRUG INTERACTIONS SECTION.

Drug Interactions. Because tetracyclines have been shown to depress plasma prothrombin activity, patients who are on anticoagulant therapy may require downward adjustment of their anticoagulant dosage.Since bacteriostatic drugs may interfere with the bactericidal action of penicillin, it is advisable to avoid giving tetracyclines in conjunction with penicillin.Absorption of tetracyclines is impaired by antacids containing aluminum, calcium, or magnesium, and iron-containing preparations.Absorption of tetracyclines is impaired by bismuth subsalicylate.Barbiturates, carbamazepine, and phenytoin decrease the half-life of doxycycline.The concurrent use of tetracycline and Penthrane(R) (methoxyflurane) has been reported to result in fatal renal toxicity. Concurrent use of tetracycline may render oral contraceptives less effective.

HOW SUPPLIED SECTION.

HOW SUPPLIED. Doxycycline Hyclate Capsules, USP equivalent to 50 mg doxycycline: No. Blue/White Opaque Hard Gelatin Capsule Printed West-ward 3141 in Black Ink.NDC 0143-3141-50: Bottle of 50 CapsulesNDC 0143-3141-05: Bottle of 500 CapsulesDoxycycline Hyclate Capsules, USP equivalent to 100 mg doxycycline: No. Blue/Blue Opaque Hard Gelatin Capsule Printed West-ward 3142 in Black Ink. NDC 0143-3142-50: Bottle of 50 CapsulesNDC 0143-3142-05: Bottle of 500 CapsulesStore at 20 to 25C (68 to 77F), [See USP Controlled Room Temperature]. Protect from light and moisture. Dispense in tight, light-resistant container as defined in the USP using child-resistant closure.

INDICATIONS & USAGE SECTION.

INDICATIONS AND USAGE. To reduce the development of drug-resistant bacteria and maintain effectiveness of Doxycycline Hyclate Capsules and other antibacterial drugs, Doxycycline Hyclate Capsules should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.. Treatment. Doxycycline is indicated for the treatment of the following infections:oRocky Mountain spotted fever, typhus fever and the typhus group, fever, rickettsialpox, and tick fevers caused by Rickettsiae.oRespiratory tract infections caused by Mycoplasma pneumoniae.oLymphogranuloma venereum caused by Chlamydia trachomatis.oPsittacosis (ornithosis) caused by Chlamydophila psittaci.oTrachoma caused by Chlamydia trachomatis, although the infectious agent is not always eliminated, as judged by immunofluorescence.oInclusion conjunctivitis caused by Chlamydia trachomatis.oUncomplicated urethral, endocervical, or rectal infections in adults caused by Chlamydia trachomatis.oNongonococcal urethritis caused by Ureaplasma urealyticum.oRelapsing fever due to Borrelia recurrentis.Doxycycline is also indicated for the treatment of infections caused by the following gram-negative microorganisms:oChancroid caused by Haemophilus ducreyi.oPlague due to Yersinia pestis.oTularemia due to Francisella tularensis.oCholera caused by Vibrio cholerae.oCampylobacter fetus infections caused by Campylobacter fetus.oBrucellosis due to Brucella species (in conjunction with streptomycin).oBartonellosis due to Bartonella bacilliformis.oGranuloma inguinale caused by Klebsiella granulomatis.Because many strains of the following groups of microorganisms have been shown to be resistant to doxycycline, culture and susceptibility testing are recommended.Doxycycline is indicated for treatment of infections caused by the following gram-negative bacteria, when bacteriologic testing indicates appropriate susceptibility to the drug:oEscherichia coli.oEnterobacter aerogenes.oShigella species.oAcinetobacter species.oRespiratory tract infections caused by Haemophilus influenzae.oRespiratory tract and urinary tract infections caused by Klebsiella species.Doxycycline is indicated for treatment of infections caused by the following gram-positive microorganisms when bacteriologic testing indicates appropriate susceptibility to the drug:oUpper respiratory infections caused by Streptococcus pneumoniae.oAnthrax due to Bacillus anthracis, including inhalational anthrax (post-exposure): to reduce the incidence or progression of disease following exposure to aerosolized Bacillus anthracis.When penicillin is contraindicated, doxycycline is an alternative drug in the treatment of the following infections:oUncomplicated gonorrhea caused by Neisseria gonorrhoeae.oSyphilis caused by Treponema pallidum.oYaws caused by Treponema pallidum subspecies pertenue.oListeriosis due to Listeria monocytogenes.oVincents infection caused by Fusobacterium fusiforme.oActinomycosis caused by Actinomyces israelii.oInfections caused by Clostridium species.In acute intestinal amebiasis, doxycycline may be useful adjunct to amebicides.In severe acne, doxycycline may be useful adjunctive therapy.. oRocky Mountain spotted fever, typhus fever and the typhus group, fever, rickettsialpox, and tick fevers caused by Rickettsiae.. oRespiratory tract infections caused by Mycoplasma pneumoniae.. oLymphogranuloma venereum caused by Chlamydia trachomatis.. oPsittacosis (ornithosis) caused by Chlamydophila psittaci.. oTrachoma caused by Chlamydia trachomatis, although the infectious agent is not always eliminated, as judged by immunofluorescence.. oInclusion conjunctivitis caused by Chlamydia trachomatis.. oUncomplicated urethral, endocervical, or rectal infections in adults caused by Chlamydia trachomatis.. oNongonococcal urethritis caused by Ureaplasma urealyticum.. oRelapsing fever due to Borrelia recurrentis.. oChancroid caused by Haemophilus ducreyi.. oPlague due to Yersinia pestis.. oTularemia due to Francisella tularensis.. oCholera caused by Vibrio cholerae.. oCampylobacter fetus infections caused by Campylobacter fetus.. oBrucellosis due to Brucella species (in conjunction with streptomycin).. oBartonellosis due to Bartonella bacilliformis.. oGranuloma inguinale caused by Klebsiella granulomatis.. oEscherichia coli.. oEnterobacter aerogenes.. oShigella species.. oAcinetobacter species.. oRespiratory tract infections caused by Haemophilus influenzae.. oRespiratory tract and urinary tract infections caused by Klebsiella species.. oUpper respiratory infections caused by Streptococcus pneumoniae.. oAnthrax due to Bacillus anthracis, including inhalational anthrax (post-exposure): to reduce the incidence or progression of disease following exposure to aerosolized Bacillus anthracis.. oUncomplicated gonorrhea caused by Neisseria gonorrhoeae.. oSyphilis caused by Treponema pallidum.. oYaws caused by Treponema pallidum subspecies pertenue.. oListeriosis due to Listeria monocytogenes.. oVincents infection caused by Fusobacterium fusiforme.. oActinomycosis caused by Actinomyces israelii.. oInfections caused by Clostridium species.. Prophylaxis. Doxycycline is indicated for the prophylaxis of malaria due to Plasmodium falciparum in short-term travelers (<4 months) to areas with chloroquine and/or pyrimethamine-sulfadoxine resistant strains (See DOSAGE AND ADMINISTRATION section and Information for Patients subsection of the PRECAUTIONS section).

INFORMATION FOR PATIENTS SECTION.

Information for Patients. Patients taking doxycycline for malaria prophylaxis should be advised:othat no present-day antimalarial agent, including doxycycline, guarantees protection against malaria.oto avoid being bitten by mosquitoes by using personal protective measures that help avoid contact with mosquitoes, especially from dusk to dawn (e.g., staying in well-screened areas, using mosquito nets, covering the body with clothing, and using an effective insect repellent).othat doxycycline prophylaxis:oshould begin to days before travel to the malarious area,oshould be continued daily while in the malarious area and after leaving the malarious area,oshould be continued for further weeks to avoid development of malaria after returning from an endemic area,oshould not exceed months.All patients taking doxycycline should be advised:oto avoid excessive sunlight or artificial ultraviolet light while receiving doxycycline and to discontinue therapy if phototoxicity (e.g., skin eruption, etc.) occurs. Sunscreen or sunblock should be considered (See WARNINGS). oto drink fluids liberally along with doxycycline to reduce the risk of esophageal irritation and ulceration (See ADVERSE REACTIONS).othat the absorption of tetracyclines is reduced when taken with foods, especially those which contain calcium. However, the absorption of doxycycline is not markedly influenced by simultaneous ingestion of food or milk (See Drug Interactions).othat the absorption of tetracyclines is reduced when taking bismuth subsalicylate (See Drug Interactions).othat the use of doxycycline might increase the incidence of vaginal candidiasis.Patients should be counseled that antibacterial drugs, including Doxycycline Hyclate Capsules should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When Doxycycline Hyclate Capsules are prescribed to treat bacterial infection, patients should be told that although it is common to feel better early in the course of therapy, the medication should be taken exactly as directed. Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by Doxycycline Hyclate Capsules or other antibacterial drugs in the future.Diarrhea is common problem caused by antibacterial drugs, which usually ends when the antibacterials are discontinued. Sometimes after starting treatment with antibacterial drugs, patients can develop watery and bloody stools (with or without stomach cramps and fever) even as late as two or more months after having taken the last dose of the antibacterial drug. If this occurs, patients should contact their physician as soon as possible.. othat no present-day antimalarial agent, including doxycycline, guarantees protection against malaria.. oto avoid being bitten by mosquitoes by using personal protective measures that help avoid contact with mosquitoes, especially from dusk to dawn (e.g., staying in well-screened areas, using mosquito nets, covering the body with clothing, and using an effective insect repellent).. othat doxycycline prophylaxis:oshould begin to days before travel to the malarious area,oshould be continued daily while in the malarious area and after leaving the malarious area,oshould be continued for further weeks to avoid development of malaria after returning from an endemic area,oshould not exceed months.. oshould begin to days before travel to the malarious area,. oshould be continued daily while in the malarious area and after leaving the malarious area,. oshould be continued for further weeks to avoid development of malaria after returning from an endemic area,. oshould not exceed months.. oto avoid excessive sunlight or artificial ultraviolet light while receiving doxycycline and to discontinue therapy if phototoxicity (e.g., skin eruption, etc.) occurs. Sunscreen or sunblock should be considered (See WARNINGS). oto drink fluids liberally along with doxycycline to reduce the risk of esophageal irritation and ulceration (See ADVERSE REACTIONS).. othat the absorption of tetracyclines is reduced when taken with foods, especially those which contain calcium. However, the absorption of doxycycline is not markedly influenced by simultaneous ingestion of food or milk (See Drug Interactions).. othat the absorption of tetracyclines is reduced when taking bismuth subsalicylate (See Drug Interactions).. othat the use of doxycycline might increase the incidence of vaginal candidiasis.

LABOR & DELIVERY SECTION.

Labor and Delivery. The effect of tetracyclines on labor and delivery is unknown.

LABORATORY TESTS SECTION.

Laboratory Tests. In venereal disease, when co-existent syphilis is suspected, dark field examinations should be done before treatment is started and the blood serology repeated monthly for at least months.In long-term therapy, periodic laboratory evaluation of organ systems, including hematopoietic, renal, and hepatic studies, should be performed.

MICROBIOLOGY SECTION.

Microbiology Mechanism of ActionDoxycycline inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit. Doxycycline has bacteriostatic activity against broad range of Gram-positive and Gram-negative bacteria. Resistance Cross resistance with other tetracyclines is common.Antimicrobial Activity Doxycycline has been shown to be active against most isolates of the following microorganisms, both in vitro and in clinical infections as described in the INDICATIONS AND USAGE section of the package insert for Doxycycline Hyclate Capsules. Gram-Negative Bacteria Acinetobacter speciesBartonella bacilliformisBrucella speciesKlebsiella speciesKlebsiella granulomatisCampylobacter fetusEnterobacter aerogenesEscherichia coliFrancisella tularensis Haemophilus ducreyi Haemophilus influenzaeNeisseria gonorrhoeaeShigella speciesVibrio choleraeYersinia pestis Gram-Positive Bacteria Bacillus anthracisListeria monocytogenesStreptococcus pneumoniaeAnaerobic BacteriaClostridium speciesFusobacterium fusiformePropionibacterium acnesOther Bacteria Nocardiae and other aerobic Actinomyces speciesBorrelia recurrentisChlamydophila psittaciChlamydia trachomatisMycoplasma pneumoniae Rickettsiae Treponema pallidumTreponema pallidum subspecies pertenueUreaplasma urealyticumParasites Balantidium coliEntamoeba speciesPlasmodium falciparumDoxycycline has been found to be active against the asexual erythrocytic forms of Plasmodium falciparum, but not against the gametocytes of P. falciparum. The precise mechanism of action of the drug is not known.Susceptibility Testing For specific information regarding susceptibility test interpretive criteria and associated test methods and quality control standards recognized by FDA for this drug, please see: https://www.fda.gov/STIC.

NONTERATOGENIC EFFECTS SECTION.

Nonteratogenic Effects. (See WARNINGS.).

NURSING MOTHERS SECTION.

Nursing Mothers. Tetracyclines are excreted in human milk; however, the extent of absorption of tetracyclines, including doxycycline, by the breastfed infant is not known. Short-term use by lactating women is not necessarily contraindicated; however, the effects of prolonged exposure to doxycycline in breast milk are unknown.4 Because of the potential for serious adverse reactions in nursing infants from doxycycline, decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother (See WARNINGS).

OVERDOSAGE SECTION.

OVERDOSAGE. In case of overdosage, discontinue medication, treat symptomatically and institute supportive measures. Dialysis does not alter serum half-life and thus would not be of benefit in treating cases of overdosage.

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL.

PRINCIPAL DISPLAY PANEL. Doxycycline Hyclate Capsules USP, 50 mgNDC 0143-3141-50, Rx Only c50000063-01-k01.jpg.

PREGNANCY SECTION.

Pregnancy. Teratogenic EffectsThere are no adequate and well-controlled studies on the use of doxycycline in pregnant women. The vast majority of reported experience with doxycycline during human pregnancy is short-term, first trimester exposure. There are no human data available to assess the effects of long-term therapy of doxycycline in pregnant women, such as that proposed for treatment of anthrax exposure. An expert review of published data on experiences with doxycycline use during pregnancy by TERIS the Teratogen Information System concluded that therapeutic doses during pregnancy are unlikely to pose substantial teratogenic risk (the quantity and quality of data were assessed as limited to fair), but the data are insufficient to state that there is no risk.1 case-control study (18,515 mothers of infants with congenital anomalies and 32,804 mothers of infants with no congenital anomalies) shows weak but marginally statistically significant association with total malformations and use of doxycycline anytime during pregnancy. Sixty-three (0.19%) of the controls and fifty-six (0.30%) of the cases were treated with doxycycline. This association was not seen when the analysis was confined to maternal treatment during the period of organogenesis (i.e., in the second and third months of gestation) with the exception of marginal relationship with neural tube defect based on only two exposed cases. A small prospective study of 81 pregnancies describes 43 pregnant women treated for 10 days with doxycycline during early first trimester. All mothers reported their exposed infants were normal at year of age.3.

REFERENCES SECTION.

REFERENCES Friedman JM and Polifka JE. Teratogenic Effects of Drugs. Resource for Clinicians (TERIS). Baltimore, MD: The Johns Hopkins University Press, 2000: 149-195. Cziezel AE and Rockenbauer M. Teratogenic study of doxycycline. Obstet Gynecol 1997; 89: 524-528. Horne HW Jr and Kundsin RB. The role of mycoplasma among 81 consecutive pregnancies: prospective study. Int Fertil 1980; 25: 315-317. Hale T. Medications and Mothers Milk. 9th edition. Amarillo, TX: Pharmasoft Publishing, 2000: 225-226.Distr. by: West-Ward Pharmaceuticals Corp.Eatontown, NJ 07724C50000068/03Revised January 2020. Friedman JM and Polifka JE. Teratogenic Effects of Drugs. Resource for Clinicians (TERIS). Baltimore, MD: The Johns Hopkins University Press, 2000: 149-195. Cziezel AE and Rockenbauer M. Teratogenic study of doxycycline. Obstet Gynecol 1997; 89: 524-528. Horne HW Jr and Kundsin RB. The role of mycoplasma among 81 consecutive pregnancies: prospective study. Int Fertil 1980; 25: 315-317. Hale T. Medications and Mothers Milk. 9th edition. Amarillo, TX: Pharmasoft Publishing, 2000: 225-226.

SPL UNCLASSIFIED SECTION.

To reduce the development of drug-resistant bacteria and maintain the effectiveness of Doxycycline Hyclate Capsules and other antibacterial drugs, Doxycycline Hyclate Capsules should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria.

WARNINGS SECTION.

WARNINGS. The use of drugs of the tetracycline class during tooth development (last half of pregnancy, infancy and childhood to the age of years) may cause permanent discoloration of the teeth (yellow-gray-brown). This adverse reaction is more common during long-term use of the drugs, but it has been observed following repeated short-term courses. Enamel hypoplasia has also been reported. Use doxycycline in pediatric patients years of age or less only when the potential benefits are expected to outweigh the risks in severe or life-threatening conditions (e.g., anthrax, Rocky Mountain spotted fever), particularly when there are no alternative therapies.Clostridium difficile associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including Doxycycline Hyclate Capsules, and may range in severity from mild diarrhea to fatal colitis. Treatment with antibacterial agents alters the normal flora of the colon leading to overgrowth of C. difficile.C. difficile produces toxins and which contribute to the development of CDAD. Hypertoxin producing strains of C. difficile cause increased morbidity and mortality, as these infections can be refractory to antimicrobial therapy and may require colectomy. CDAD must be considered in all patients who present with diarrhea following the use of antibacterial drugs. Careful medical history is necessary since CDAD has been reported to occur over two months after the administration of antibacterial agents.If CDAD is suspected or confirmed, ongoing use of antibacterial drugs not directed against C. difficile may need to be discontinued. Appropriate fluid and electrolyte management, protein supplementation, antibacterial treatment of C. difficile, and surgical evaluation should be instituted as clinically indicated.Severe skin reactions, such as exfoliative dermatitis, erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis, and drug reaction with eosinophilia and systemic symptoms (DRESS) have been reported in patients receiving doxycycline (See ADVERSE REACTIONS). If severe skin reactions occur, doxycycline should be discontinued immediately and appropriate therapy should be instituted.Intracranial hypertension (IH, pseudotumor cerebri) has been associated with the use of tetracyclines including Doxycycline Hyclate Capsules. Clinical manifestations of IH include headache, blurred vision, diplopia, and vision loss; papilledema can be found on fundoscopy. Women of childbearing age who are overweight or have history of IH are at greater risk for developing tetracycline associated IH. Concomitant use of isotretinoin and Doxycycline Hyclate Capsules should be avoided because isotretinoin is also known to cause pseudotumor cerebri.Although IH typically resolves after discontinuation of treatment, the possibility for permanent visual loss exists. If visual disturbance occurs during treatment, prompt ophthalmologic evaluation is warranted. Since intracranial pressure can remain elevated for weeks after drug cessation patients should be monitored until they stabilize.All tetracyclines form stable calcium complex in any bone-forming tissue. decrease in fibula growth rate has been observed in prematures given oral tetracycline in doses of 25 mg/kg every hours. This reaction was shown to be reversible when the drug was discontinued.Results of animal studies indicate that tetracyclines cross the placenta, are found in fetal tissues, and can have toxic effects on the developing fetus (often related to retardation of skeletal development). Evidence of embryotoxicity has also been noted in animals treated early in pregnancy. If any tetracycline is used during pregnancy or if the patient becomes pregnant while taking this drug, the patient should be apprised of the potential hazard to the fetus.The antianabolic action of the tetracyclines may cause an increase in BUN. Studies to date indicate that this does not occur with the use of doxycycline in patients with impaired renal function.Photosensitivity manifested by an exaggerated sunburn reaction has been observed in some individuals taking tetracyclines. Patients apt to be exposed to direct sunlight or ultraviolet light should be advised that this reaction can occur with tetracycline drugs, and treatment should be discontinued at the first evidence of skin erythema.