PACKAGE LABEL.PRINCIPAL DISPLAY PANEL.
PACKAGE LABEL PRINCIPAL DISPLAY PANEL Bottle Label NDC 25021-158-99 Rx only Vancomycin Hydrochloride for Injection, USP (Formerly: Sterile Vancomycin Hydrochloride) PHARMACY BULK PACKAGE NOT FOR DIRECT INFUSION 10 grams per Pharmacy Bulk Package For Intravenous Use After Dilution AFTER RECONSTITUTION MUST BE FURTHER DILUTED BEFORE INFUSION. NOT TO BE DISPENSED AS A UNIT.
ADVERSE REACTIONS SECTION.
ADVERSE REACTIONS Infusion-Related Events During or soon after rapid infusion of vancomycin hydrochloride, patients may develop anaphylactoid reactions, including hypotension (see ANIMAL PHARMACOLOGY ), wheezing, dyspnea, urticaria, or pruritus. Rapid infusion may also cause flushing of the upper body (red neck) or pain and muscle spasm of the chest and back. These reactions usually resolve within 20 minutes but may persist for several hours. Such events are infrequent if vancomycin hydrochloride is given by a slow infusion over 60 minutes. In studies of normal volunteers, infusion-related events did not occur when vancomycin hydrochloride was administered at a rate of 10 mg/min or less. Nephrotoxicity Renal failure, principally manifested by increased serum creatinine or BUN concentrations, especially in patients administered large doses of vancomycin hydrochloride, has been reported rarely. Cases of interstitial nephritis have also been reported rarely. Most of these have occurred in patients who were given aminoglycosides concomitantly or who had preexisting kidney dysfunction. When vancomycin was discontinued, azotemia resolved in most patients. Gastrointestinal Onset of pseudomembranous colitis symptoms may occur during or after antibiotic treatment (see WARNINGS ). Ototoxicity A few dozen cases of hearing loss associated with vancomycin hydrochloride have been reported. Most of these patients had kidney dysfunction or a preexisting hearing loss or were receiving concomitant treatment with an ototoxic drug. Vertigo, dizziness, and tinnitus have been reported rarely. Hematopoietic Reversible neutropenia, usually starting 1 week or more after onset of therapy with vancomycin hydrochloride or after a total dosage of more than 25 grams, has been reported for several dozen patients. Neutropenia appears to be promptly reversible when vancomycin hydrochloride is discontinued. Thrombocytopenia has rarely been reported. Although a causal relationship has not been established, reversible agranulocytosis (granulocytes <500/mm3) has been reported rarely. Phlebitis Inflammation at the injection site has been reported. Miscellaneous Infrequently, patients have been reported to have had anaphylaxis, drug fever, nausea, chills, eosinophilia, rashes including exfoliative dermatitis, linear IgA bullous dermatosis, Stevens-Johnson syndrome, toxic epidermal necrolysis and vasculitis in association with the administration of vancomycin hydrochloride. Chemical peritonitis has been reported following intraperitoneal administration (see PRECAUTIONS ). POST MARKETING REPORTS The following adverse reactions have been identified during post-approval use of vancomycin. Because these reactions are reported voluntarily from a population of uncertain size, it is not possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Skin and Subcutaneous Tissue Disorders Drug Rash with Eosinophilia and Systemic Symptoms (DRESS) To report SUSPECTED ADVERSE REACTIONS, contact Sagent Pharmaceuticals, Inc. at 1-866-625-1618 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch .
INDICATIONS & USAGE SECTION.
INDICATIONS AND USAGE Vancomycin Hydrochloride for Injection, USP is indicated for the treatment of serious or severe infections caused by susceptible strains of methicillin-resistant (-lactam-resistant) staphylococci. It is indicated for penicillin-allergic patients, for patients who cannot receive or who have failed to respond to other drugs, including the penicillins or cephalosporins, and for infections caused by vancomycin-susceptible organisms that are resistant to other antimicrobial drugs. Vancomycin Hydrochloride for Injection, USP is indicated for initial therapy when methicillin-resistant staphylococci are suspected, but after susceptibility data are available, therapy should be adjusted accordingly. Vancomycin Hydrochloride for Injection, USP is effective in the treatment of staphylococcal endocarditis. Its effectiveness has been documented in other infections due to staphylococci, including septicemia, bone infections, lower respiratory tract infections, skin and skin structure infections. When staphylococcal infections are localized and purulent, antibiotics are used as adjuncts to appropriate surgical measures. Vancomycin Hydrochloride for Injection, USP has been reported to be effective alone or in combination with an aminoglycoside for endocarditis caused by S. viridans or S. bovis. For endocarditis caused by enterococci (e.g., E. faecalis), Vancomycin Hydrochloride for Injection, USP has been reported to be effective only in combination with an aminoglycoside. Vancomycin Hydrochloride for Injection, USP has been reported to be effective for the treatment of diphtheroid endocarditis. Vancomycin Hydrochloride for Injection, USP has been used successfully in combination with either rifampin, an aminoglycoside, or both in early-onset prosthetic valve endocarditis caused by S. epidermidis or diphtheroids. Specimens for bacteriologic cultures should be obtained in order to isolate and identify causative organisms and to determine their susceptibilities to vancomycin hydrochloride. To reduce the development of drug-resistant bacteria and maintain the effectiveness of Vancomycin Hydrochloride for Injection, USP and other antibacterial drugs, Vancomycin Hydrochloride for Injection, USP 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. The parenteral form of Vancomycin Hydrochloride for Injection, USP may be administered orally for treatment of antibiotic-associated pseudomembranous colitis produced by C. difficile and for staphylococcal enterocolitis. Parenteral administration of vancomycin hydrochloride alone is of unproven benefit for these indications. Vancomycin is not effective by the oral route for other types of infection.
DOSAGE & ADMINISTRATION SECTION.
DOSAGE AND ADMINISTRATION The intent of the pharmacy bulk package for this product is for preparation of solutions for IV infusion only. Infusion-related events are related to both the concentration and the rate of administration of vancomycin. Concentrations of no more than 5 mg per mL and rates of no more than 10mg/min, are recommended in adults (see also age-specific recommendations). In selected patients in need of fluid restriction, a concentration up to 10mg per mL may be used; use of such higher concentrations may increase the risk of infusion-related events. An infusion rate of 10 mg/min or less is associated with fewer infusion-related events (see ADVERSE REACTIONS ). Infusion-related events may occur, however, at any rate or concentration. Patients With Normal Renal Function Adults The usual daily intravenous dose is 2 grams divided either as 500 mg every 6 hours or 1 gram every 12 hours. Each dose should be administered at no more than 10 mg/min or over a period of at least 60 minutes, whichever is longer. Other patient factors, such as age or obesity, may call for modification of the usual intravenous daily dose. Pediatric patients The usual intravenous dosage of vancomycin is 10 mg/kg per dose given every 6 hours. Each dose should be administered over a period of at least 60 minutes. Close monitoring of serum concentrations of vancomycin may be warranted in these patients. Neonates In pediatric patients up to the age of 1 month, the total daily intravenous dosage may be lower. In neonates, an initial dose of 15 mg/kg is suggested, followed by 10 mg/kg every 12 hours for neonates in the 1st week of life and every 8 hours thereafter up to the age of 1 month. Each dose should be administered over 60 minutes. In premature infants, vancomycin clearance decreases as postconceptional age decreases. Therefore, longer dosing intervals may be necessary in premature infants. Close monitoring of serum concentrations of vancomycin is recommended in these patients. Patients With Impaired Renal Function and Elderly Patients Dosage adjustment must be made in patients with impaired renal function. In premature infants and the elderly, greater dosage reductions than expected may be necessary because of decreased renal function. Measurement of vancomycin serum concentrations can be helpful in optimizing therapy, especially in seriously ill patients with changing renal function. Vancomycin serum concentrations can be determined by use of microbiologic assay, radioimmunoassay, fluorescence polarization immunoassay, fluorescence immunoassay, or high-pressure liquid chromatography. If creatinine clearance can be measured or estimated accurately, the dosage for most patients with renal impairment can be calculated using the following table. The dosage of vancomycin per day in mg is about 15 times the glomerular filtration rate in mL/min (see following table). DOSAGE TABLE FOR VANCOMYCIN IN PATIENTS WITH IMPAIRED RENAL FUNCTION (Adapted from Moellering et al.4) Creatinine Clearance mL/min Vancomycin Dose mg/24 hr 100 1,545 90 1,390 80 1,235 70 1,080 60 925 50 770 40 620 30 465 20 310 10 155 The initial dose should be no less than 15 mg/kg, even in patients with mild to moderate renal insufficiency. The table is not valid for functionally anephric patients. For such patients, an initial dose of 15 mg/kg of body weight should be given to achieve prompt therapeutic serum concentrations. The dose required to maintain stable concentrations is 1.9 mg/kg/24 hr. In patients with marked renal impairment, it may be more convenient to give maintenance doses of 250 to 1,000 mg once every several days rather than administering the drug on a daily basis. In anuria, a dose of 1,000 mg every 7 to 10 days has been recommended. When only serum creatinine is known, the following formula (based on sex, weight and age of the patient) may be used to calculate creatinine clearance. Calculated creatinine clearances (mL/min) are only estimates. The creatinine clearance should be measured promptly. The serum creatinine must represent a steady state of renal function. Otherwise, the estimated value for creatinine clearance is not valid. Such a calculated clearance is an overestimate of actual clearance in patients with conditions: (1) characterized by decreasing renal function, such as shock, severe heart failure, or oliguria; (2) in which a normal relationship between muscle mass and total body weight is not present, such as in obese patients or those with liver disease, edema, or ascites; and (3) accompanied by debilitation, malnutrition, or inactivity. The safety and efficacy of vancomycin administration by the intrathecal (intralumbar or intraventricular) routes have not been established. Intermittent infusion is the recommended method of administration. Compatibility with Other Drugs and IV Fluids The following diluents are physically and chemically compatible (with 4 g/L vancomycin hydrochloride): 5% Dextrose Injection, USP 5% Dextrose Injection and 0.9% Sodium Chloride Injection, USP Lactated Ringer's Injection, USP 5% Dextrose and Lactated Ringer's Injection Normosol-M and 5% Dextrose 0.9% Sodium Chloride Injection, USP IsolyteE Good professional practice suggests that compounded admixtures should be administered as soon after preparation as is feasible. Vancomycin solution has a low pH and may cause physical instability of other compounds. Mixtures of solutions of vancomycin and beta-lactam antibiotics have been shown to be physically incompatible. The likelihood of precipitation increases with higher concentrations of vancomycin. It is recommended to adequately flush the intravenous lines between the administration of these antibiotics. It is also recommended to dilute solutions of vancomycin to 5 mg per mL or less. Although intravitreal injection is not an approved route of administration for vancomycin, precipitation has been reported after intravitreal injection of vancomycin and ceftazidime for endophthalmitis using different syringes and needles. The precipitates dissolved gradually, with complete clearing of the vitreous cavity over two months and with improvement of visual acuity.
SPL UNCLASSIFIED SECTION.
PREPARATION AND STABILITY For Administration by Intravenous Drip Refer to Directions for Proper Use of a Pharmacy Bulk Package Bottle. CAUTION: NOT TO BE DISPENSED AS A UNIT. Directions for Proper Use of Pharmacy Bulk Package The container closure may be penetrated only one time after reconstitution, utilizing a suitable sterile dispensing set which allows measured distribution of the contents. Use of this product is restricted to a suitable work area, such as a laminar flow hood. Once this container closure has been punctured, withdrawal of the contents should be completed without delay. If prompt fluid transfer cannot be accomplished, discard the contents no later than 4 HOURS after initial closure puncture. This time limit should begin with the introduction of solvent for diluent into the Pharmacy Bulk Package. Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit. Do not add supplementary medication to Vancomycin for Injection, USP. Preparation and Stability 5 gram Pharmacy Bulk Package bottle At the time of use, reconstitute by adding 100 mL of Sterile Water for Injection to the 5 gram Pharmacy Bulk Package bottle of dry, sterile vancomycin powder. The resultant solution will contain vancomycin equivalent to 500 mg per 10 mL. FURTHER DILUTION IS REQUIRED. Reconstituted solutions of vancomycin (500 mg per 10 mL) must be further diluted in at least 100 mL of a suitable infusion solution. Doses of 1 gram (20 mL) must be further diluted in at least 200 mL of a suitable infusion solution. The desired dose diluted in this manner should be administered by intermittent intravenous infusion over a period of at least 60 minutes. 10 gram Pharmacy Bulk Package bottle At the time of use, reconstitute by adding 95 mL of Sterile Water for Injection, USP to the 10 gram Pharmacy Bulk Package bottle of dry, sterile vancomycin powder. The resultant solution will contain vancomycin equivalent to 500 mg per 5 mL (1 gram per 10 mL). AFTER RECONSTITUTION, FURTHER DILUTION IS REQUIRED. Reconstituted solutions of vancomycin (500 mg per 5 mL) must be further diluted in at least 100 mL of a suitable infusion solution. For doses of 1 gram (10 mL), at least 200 mL of solution must be used. The desired dose diluted in this manner should be administered by intermittent IV infusion over a period of at least 60 minutes. Parenteral drug products should be visually inspected for particulate matter and discoloration prior to administration, whenever solution and container permit. For Oral Administration Oral vancomycin is used in treating antibiotic-associated pseudomembranous colitis caused by C. difficile and for staphylococcal enterocolitis. Vancomycin is not effective by the oral route for other types of infections. The usual adult total daily dosage is 500 mg to 2 grams given in 3 or 4 divided doses for 7 to 10 days. The total daily dose in children is 40 mg/kg of body weight in 3 or 4 divided doses for 7 to 10 days. The total daily dosage should not exceed 2 grams. The appropriate dose may be diluted in 1 oz of water and given to the patients to drink. Common flavoring syrups may be added to the solution to improve the taste for oral administration. The diluted solution may be administered via a nasogastric tube. HOW SUPPLIED/STORAGE AND HANDLING Vancomycin Hydrochloride for Injection, USP Pharmacy Bulk Package bottle, is supplied as follows: NDC Vancomycin Hydrochloride for Injection, USP Package Factor 25021-157-99 5 gram Pharmacy Bulk Package Bottle 1 bottle per carton (equivalent to 5 grams vancomycin) 25021-158-99 10 gram Pharmacy Bulk Package Bottle 1 bottle per carton (equivalent to 10 grams vancomycin) Storage Conditions Prior to reconstitution, store dry powder at 20 to 25C (68 to 77F). [See USP Controlled Room Temperature.] Lyophilized, Sterile, Nonpyrogenic, Preservative-free. The container closure is not made with natural rubber latex.
DESCRIPTION Vancomycin Hydrochloride for Injection, USP is a lyophilized powder, for preparing intravenous (IV) infusions, in Pharmacy Bulk Package bottles containing the equivalent of 5 grams or 10 grams vancomycin base. 500 mg of the base are equivalent to 0.34 mmol. When reconstituted with Sterile Water for Injection to a concentration of 50 mg per mL for the 5 gram Pharmacy Bulk Package bottle and 100 mg per mL for the 10 gram Pharmacy Bulk Package bottle, the pH of the solution is between 2.5 and 4.5. Vancomycin Hydrochloride for Injection, USP should be administered intravenously in diluted solution (see DOSAGE AND ADMINISTRATION ). Vancomycin Hydrochloride for Injection, USP is a tricyclic glycopeptide antibiotic derived from Amycolatopasis orientalis (formerly Nocardia orientalis). The chemical name for vancomycin hydrochloride is (S a )-(3S,6R,7R,22R,23S,26S,36R,38aR)-44-[[2-O-(3-Amino- 2,3,6-trideoxy-3-C-methyl--L-lyxo-hexopyranosyl)--D-glucopyranosyl]oxy]-3-(carbamoylmethyl)-10,19-dichloro-2,3,4,5,6,7,23,24,25,26,36,37,38,38a-tetradecahydro- 7,22,28,30,32-pentahydroxy-6-[(2R)-4-methyl-2-(methylamino)]valeramido]-2,5,24,38,39-pentaoxo-22H-8,11:18,21-dietheno-23,36-(iminomethano)-13,16:31,35-dimetheno-1H,16H-[1,6,9]oxadiazacyclohexadecino[4,5-m][10,2,16]benzoxadiazacyclotetracosine-26-carboxylic acid, monohydrochloride. The molecular formula is C66H75Cl2N9O24HCl and the molecular weight is 1,485.73. Vancomycin hydrochloride has the following structural formula: A pharmacy bulk package is a container of a sterile preparation for parenteral use that contains many single doses. The contents of this pharmacy bulk package are intended for use by a pharmacy admixture service for addition to suitable parenteral fluids in the preparation of admixtures for intravenous infusion (see DOSAGE AND ADMINISTRATION, Directions for Proper Use of Pharmacy Bulk Package ). FURTHER DILUTION IS REQUIRED. NOT FOR DIRECT INFUSION.
OVERDOSAGE Supportive care is advised, with maintenance of glomerular filtration. Vancomycin is poorly removed by dialysis. Hemofiltration and hemoperfusion with polysulfone resin have been reported to result in increased vancomycin clearance. The median lethal intravenous dose is 319 mg/kg in rats and 400 mg/kg in mice. To obtain up-to-date information about the treatment of overdose, a good resource is your certified Regional Poison Control Center. Telephone numbers of certified poison control centers are listed in the Physicians' Desk Reference (PDR). In managing overdosage, consider the possibility of multiple drug overdoses, interaction among drugs, and unusual drug kinetics in your patient.
PRECAUTIONS General Clinically significant serum concentrations have been reported in some patients being treated for active C. difficile-induced pseudomembranous colitis after multiple oral doses of vancomycin. Prolonged use of vancomycin hydrochloride may result in the overgrowth of nonsusceptible microorganisms. Careful observation of the patient is essential. If superinfection occurs during therapy, appropriate measures should be taken. In rare instances, there have been reports of pseudomembranous colitis due to C. difficile developing in patients who received intravenous vancomycin hydrochloride. In order to minimize the risk of nephrotoxicity when treating patients with underlying renal dysfunction or patients receiving concomitant therapy with an aminoglycoside, serial monitoring of renal function should be performed and particular care should be taken in following appropriate dosing schedules (see DOSAGE AND ADMINISTRATION ). Serial tests of auditory function may be helpful in order to minimize the risk of ototoxicity. Reversible neutropenia has been reported in patients receiving vancomycin hydrochloride (see ADVERSE REACTIONS ). Patients who will undergo prolonged therapy with vancomycin hydrochloride or those who are receiving concomitant drugs which may cause neutropenia should have periodic monitoring of the leukocyte count. Vancomycin hydrochloride for injection is irritating to tissue and must be given by a secure IV route of administration. Pain, tenderness, and necrosis occur with intramuscular (IM) injection of vancomycin hydrochloride for injection or with inadvertent extravasation. Thrombophlebitis may occur, the frequency and severity of which can be minimized by administering the drug slowly as a dilute solution (2.5 to 5 g/L) and by rotation of venous access sites. There have been reports that the frequency of infusion-related events (including hypotension, flushing, erythema, urticaria, and pruritus) increases with the concomitant administration of anesthetic agents. Infusion-related events may be minimized by the administration of vancomycin as a 60-minute infusion prior to anesthetic induction. The safety and efficacy of vancomycin administered by the intrathecal (intralumbar or intraventricular) route or by the intraperitoneal route have not been established by adequate and well controlled trials. Although the safety and efficacy of vancomycin by the intraperitoneal route have not been established, reports have revealed that administration of sterile vancomycin by the intraperitoneal route during continuous ambulatory peritoneal dialysis (CAPD) has resulted in a syndrome of chemical peritonitis. To date, this syndrome has ranged from cloudy dialysate alone to a cloudy dialysate accompanied by variable degrees of abdominal pain and fever. This syndrome appears to be short-lived after discontinuation of intraperitoneal vancomycin. Prescribing Vancomycin Hydrochloride for Injection, USP in the absence of a proven or strongly suspected bacterial infection or a prophylactic indication is unlikely to provide benefit to the patient and increases the risk of the development of drug-resistant bacteria. DRUG INTERACTIONS Concomitant administration of vancomycin and anesthetic agents has been associated with erythema and histamine-like flushing (see Pediatric Use under PRECAUTIONS ) and anaphylactoid reactions (see ADVERSE REACTIONS ). Concurrent and/or sequential systemic or topical use of other potentially, neurotoxic and/or nephrotoxic drugs, such as amphotericin B, aminoglycosides, bacitracin, polymixin B, colistin, viomycin, or cisplatin, when indicated, requires careful monitoring. Carcinogenesis, Mutagenesis, Impairment of Fertility Although no long-term studies in animals have been performed to evaluate carcinogenic potential, no mutagenic potential of vancomycin hydrochloride was found in standard laboratory tests. No definitive fertility studies have been performed. Pregnancy Teratogenic Effects Pregnancy Category C Animal reproduction studies have not been conducted with vancomycin. It is not known whether vancomycin can affect reproduction capacity. In a controlled clinical study, the potential ototoxic and nephrotoxic effects of vancomycin hydrochloride on infants were evaluated when the drug was administered to pregnant women for serious staphylococcal infections complicating intravenous drug abuse. Vancomycin hydrochloride was found in cord blood. No sensorineural hearing loss or nephrotoxicity attributable to vancomycin hydrochloride was noted. One infant whose mother received vancomycin in the third trimester experienced conductive hearing loss that was not attributed to the administration of vancomycin. Because the number of patients treated in this study was limited and vancomycin hydrochloride was administered only in the second and third trimesters, it is not known whether vancomycin hydrochloride causes fetal harm. Vancomycin should be given to a pregnant woman only if clearly needed. Nursing Mothers Vancomycin hydrochloride is excreted in human milk. Caution should be exercised when vancomycin hydrochloride is administered to a nursing woman. Because of the potential for adverse events, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother. Pediatric Use In pediatric patients, it may be appropriate to confirm desired vancomycin serum concentrations. Concomitant administration of vancomycin and anesthetic agents has been associated with erythema and histamine-like flushing in pediatric patients (see PRECAUTIONS ). Geriatric Use The natural decrement of glomerular filtration with increasing age may lead to elevated vancomycin serum concentrations if dosage is not adjusted. Vancomycin dosage schedules should be adjusted in elderly patients (see DOSAGE AND ADMINISTRATION ). Information for Patients Patients should be counseled that antibacterial drugs including Vancomycin Hydrochloride for Injection, USP should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When Vancomycin Hydrochloride for Injection, USP is prescribed to treat a 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 Vancomycin Hydrochloride for Injection, USP or other antibacterial drugs in the future. Diarrhea is a common problem caused by antibiotics which usually ends when the antibiotic is discontinued. Sometimes after starting treatment with antibiotics, 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 antibiotic. If this occurs, patients should contact their physician as soon as possible.
REFERENCES Methods for Dilution Antimicrobial Susceptibility Tests for Bacteria That Grow Aerobically; Approved Standard - Eighth ed., CLSI document M07-A8. Clinical and Laboratory Standards Institute. Wayne, PA. January, 2009. Performance Standards for Antimicrobial Susceptibility Testing; Twenty-First Informational Supplement, CLSI document M100-S21. Clinical and Laboratory Standards Institute. Wayne, PA. January, 2011. Performance Standards for Antimicrobial Disk Susceptibility Tests; Approved Standard - Tenth ed., CLSI document M02-A10. Clinical and Laboratory Standards Institute. Wayne, PA. January, 2009. Moellering RC, Krogstad DJ, Greenblatt DJ: Vancomycin therapy in patients with impaired renal function: A nomogram for dosage. Ann Inter Med 1981;94:343. Brands listed are the trademarks of their respective owners. SAGENT Mfd. for SAGENT Pharmaceuticals Schaumburg, IL 60195 (USA) Made in India 2015 Sagent Pharmaceuticals, Inc. Revised: October 2015
ANIMAL PHARMACOLOGY & OR TOXICOLOGY SECTION.
ANIMAL PHARMACOLOGY In animal studies, hypotension and bradycardia occurred in dogs receiving an intravenous infusion of vancomycin hydrochloride 25 mg/kg, at a concentration of 25 mg per mL and an infusion rate of 13.3 mL/min.
CLINICAL PHARMACOLOGY SECTION.
CLINICAL PHARMACOLOGY Vancomycin is poorly absorbed after oral administration. In subjects with normal kidney function, multiple intravenous dosing of 1 gram of vancomycin (15 mg/kg) infused over 60 minutes produces mean plasma concentrations of approximately 63 mcg/mL immediately after the completion of infusion, mean plasma concentrations of approximately 23 mcg/mL 2 hours after infusion, and mean plasma concentrations of approximately 8 mcg/mL 11 hours after the end of the infusion. Multiple dosing of 500 mg infused over 30 minutes produces mean plasma concentrations of about 49 mcg/mL at the completion of infusion, mean plasma concentrations of about 19 mcg/mL 2 hours after infusion, and mean plasma concentrations of about 10 mcg/mL 6 hours after infusion. The plasma concentrations during multiple dosing are similar to those after a single dose. The mean elimination half-life of vancomycin from plasma is 4 to 6 hours in subjects with normal renal function. In the first 24 hours, about 75% of an administered dose of vancomycin is excreted in urine by glomerular filtration. Mean plasma clearance is about 0.058 L/kg/h, and mean renal clearance is about 0.048 L/kg/h. Renal dysfunction slows excretion of vancomycin. In anephric patients, the average half-life of elimination is 7.5 days. The distribution coefficient is from 0.3 to 0.43 L/kg. There is no apparent metabolism of the drug. About 60% of an intraperitoneal dose of vancomycin administered during peritoneal dialysis is absorbed systemically in 6 hours. Serum concentrations of about 10mcg/mL are achieved by intraperitoneal injection of 30 mg/kg of vancomycin. However, the safety and efficacy of the intraperitoneal use of vancomycin has not been established in adequate and well-controlled trials (see PRECAUTIONS). Total systemic and renal clearance of vancomycin may be reduced in the elderly. Vancomycin is approximately 55% serum protein bound as measured by ultrafiltration at vancomycin serum concentrations of 10 to 100 mcg/mL. After IV administration of vancomycin, inhibitory concentrations are present in pleural, pericardial, ascitic, and synovial fluids; in urine; in peritoneal dialysis fluid; and in atrial appendage tissue. Vancomycin does not readily diffuse across normal meninges into the spinal fluid; but, when the meninges are inflamed, penetration into the spinal fluid occurs. MICROBIOLOGY The bactericidal action of vancomycin results primarily from inhibition of cell-wall biosynthesis. In addition, vancomycin alters bacterial-cell-membrane permeability and RNA synthesis. There is no cross-resistance between vancomycin and other antibiotics. Vancomycin is not active in vitro against gram-negative bacilli, mycobacteria, or fungi. Synergy The combination of vancomycin and an aminoglycoside acts synergistically in vitro against many strains of Staphylococcus aureus, Streptococcus bovis, enterococci, and the viridans group streptococci. Vancomycin has been shown to be active against most strains of the following microorganisms, both in vitro and in clinical infections as described in the INDICATIONS AND USAGE section. Aerobic gram-positive microorganisms Diphtheroids Enterococci (e.g., Enterococcus faecalis) Staphylococci, including Staphylococcus aureus and Staphylococcus epidermidis (including heterogeneous methicillin-resistant strains) Streptococcus bovis Viridans group streptococci The following in vitro data are available, but their clinical significance is unknown. Vancomycin exhibits in vitro MIC's of 1 mcg/mL or less against most (90%) strains of streptococci listed below and MIC's of 4 mcg/mL or less against most (90%) strains of other listed microorganisms; however, the safety and effectiveness of vancomycin in treating clinical infections due to these microorganisms have not been established in adequate and well-controlled clinical trials. Aerobic gram-positive microorganisms Listeria monocytogenes Streptococcus pyogenes Streptococcus pneumoniae (including penicillin-resistant strains) Streptococcus agalactiae Anaerobic gram-positive microorganisms Actinomyces species Lactobacillus species Susceptibility Test Methods When available, the clinical microbiology laboratory should provide the results of in vitro susceptibility test results for antimicrobial drugs used in local hospitals and practice areas to the physician as periodic reports that describe the susceptibility profile of nosocomial and communityacquired pathogens. These reports should aid the physician in selecting the most effective antimicrobial. Dilution Techniques Quantitative methods are used to determine antimicrobial minimum inhibitory concentrations (MICs). These MICs provide estimates of the susceptibility of bacteria to antimicrobial compounds. The MICs should be determined using a standardized procedure. Standardized procedures are based on dilution method1,2 (broth, agar or microdilution) or equivalent using standardized inoculum and concentrations of vancomycin powder. The MIC values should be interpreted according to the criteria in Table 1. Diffusion Techniques Quantitative methods that require measurement of zone diameters also provide reproducible estimates of the susceptibility of bacteria to antimicrobial compounds. One such standardized procedure2,3 requires the use of standardized inoculum concentrations. This procedure uses paper disks impregnated with 30 mcg of vancomycin to test the susceptibility of microorganisms to vancomycin. Interpretation involves correlation of the diameter obtained in the disk test with the MIC for vancomycin. Reports from the laboratory providing results of the standard single-disk susceptibility test with a 30 mcg vancomycin disk should be interpreted according to the following criteria in Table 1. Table 1. Susceptibility Test Interpretive Criteria for Vancomycin a Isolates with vancomycin MICs of 8 to 16 mcg/mL should be further screened for vancomycin resistance using standardized procedures1,2. b Plates should be held for a full 24 hours and examined using transmitted light. Measure the diameter of the zones of complete inhibition (as judged by the unaided eye), including the diameter of the disk. The zone margin should be considered the area showing no obvious, visible growth that can be detected with the unaided eye. Ignore faint growth of tiny colonies that can be detected only with a magnifying lens at the edge of the zone of inhibited growth. Any discernable growth within the zone of inhibition indicates vancomycin resistance. Organisms with intermediate zones should be tested by a standardized dilution method1,2. c Dilution testing should be performed to determine the susceptibility of all staphylococcal isolates. Disk diffusion testing is not reliable for testing vancomycin, as it does not differentiate vancomycin-susceptible isolates of S. aureus from vancomycin-intermediate isolates, nor does it differentiate among vancomycin-susceptible, intermediate, and resistant isolates of coagulase-negative staphylococci2. d Any S. aureus isolate for which the vancomycin MIC is 8 mcg/mL should be sent to a reference laboratory 2 . e Any coagulase-negative Staphylococcus isolate for which the vancomycin MIC is 32 mcg/mL should be sent to a reference laboratory 2 . f The rare occurrence of resistant isolates precludes defining any results categories other than Susceptible. For isolates yielding results suggestive of a nonsusceptible category, organism identification and vancomycin susceptibility test results should be confirmed. If confirmed, isolates should be sent to a reference laboratory 2 . g Interpretative criteria applicable only to tests performed by broth microdilution method using cation-adjusted Mueller-Hinton broth with 2 to 5% lysed horse blood1,2. h Interpretative criteria applicable only to tests performed by disk diffusion method using Mueller-Hinton agar with 5% defibrinated sheep blood and incubated in 5% CO2 3. Minimum Inhibitory Concentrations (mcg/mL) Disk Diffusion Diameters (mm) Pathogen Susceptible (S) Intermediate (I) Resistant (R) Susceptible (S) Intermediate (I) Resistant (R) Enterococci 4 8 - 16a 32 17b 15 - 16b 14b Staphylococcus aureus. c,d 2 4 - 8 16 - - - Coagulase-negative staphylococcid,e 4 8 - 16 32 - - - Streptococci spp. other than S. pneumoniae 1f,g - - 17f,h - - A report of Susceptible indicates that the pathogen is likely to be inhibited if the antimicrobial compound in the blood reaches the concentrations usually achievable. A report of Intermediate indicates that the result should be considered equivocal, and, if the microorganism is not fully susceptible to alternative, clinically feasible drugs, the test should be repeated. This category implies possible clinical applicability in body sites where the drug is physiologically concentrated or in situations where high dosage of drug can be used. This category also provides a buffer zone which prevents small uncontrolled technical factors from causing major discrepancies in interpretation. A report of Resistant indicates that the pathogen is not likely to be inhibited if the antimicrobial compound in the blood reaches the concentrations usually achievable; other therapy should be selected. Quality Control Standardized susceptibility test procedures require the use of laboratory control microorganisms to monitor and ensure the accuracy and precision of the supplies and reagents used in the assay, and the techniques of the individuals performing the test. When tested against appropriate quality control strains, standard vancomycin powder should provide MIC values shown in Table 2. For the diffusion technique, the 30 mcg vancomycin disk should provide the zone diameters in Table 2 with the quality control strains: Table 2. In Vitro Susceptibility Test Quality Control Ranges for Vancomycin a Quality control strain and interpretive criteria for testing vancomycin susceptibility of enterococci spp. b Interpretative criteria applicable only to tests performed using cationadjusted Mueller-Hinton broth with 2 to 5% lysed horse blood1. Disk diffusion interpretative criteria applicable only to tests performed using Mueller-Hinton agar with 5% defibrinated sheep blood and incubated in 5% CO2 2. c Quality control strain and interpretive criteria for testing vancomycin susceptibility of Streptococci spp. other than S. pneumoniae. Organism (ATCC #) MIC range (mcg/mL) Disk diffusion range (mm) Enterococcus faecalis (29212) 1 - 4 Not applicable Staphylococcus aureus (29213) 0.5 - 2 Not applicable Staphylococcus aureus (25923)a Not applicable 17 - 21 Streptococcus pneumoniae (49619)b,c 0.12 - 0.5 20 - 27
CONTRAINDICATIONS Vancomycin hydrochloride is contraindicated in patients with known hypersensitivity to this antibiotic.
WARNINGS Rapid bolus administration (e.g., over several minutes) may be associated with exaggerated hypotension, including shock and rarely cardiac arrest. Vancomycin hydrochloride should be administered in a diluted solution over a period of not less than 60 minutes to avoid rapid-infusion-related reactions. Stopping the infusion usually results in prompt cessation of these reactions. Ototoxicity has occurred in patients receiving vancomycin hydrochloride. It may be transient or permanent. It has been reported mostly in patients who have been given excessive doses, who have an underlying hearing loss, or who are receiving concomitant therapy with another ototoxic agent, such as an aminoglycoside. Vancomycin should be used with caution in patients with renal insufficiency because the risk of toxicity is appreciably increased by high, prolonged blood concentrations. Dosage of vancomycin hydrochloride must be adjusted for patients with renal dysfunction (see PRECAUTIONS and DOSAGE AND ADMINISTRATION ). Clostridium difficile associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including Vancomycin Hydrochloride for Injection, USP, 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 A and B 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 antibiotic use. 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 antibiotic use not directed against C. difficile may need to be discontinued. Appropriate fluid and electrolyte management, protein supplementation, antibiotic treatment of C. difficile, and surgical evaluation should be instituted as clinically indicated.