TYZAVAN

1 INDICATIONS AND USAGE TYZAVAN is a glycopeptide antibacterial indicated for the treatment of the following infections in adult and pediatric patients (1 month and older) for whom appropriate dosing with this formulation can be achieved: Septicemia ( 1.1 ) Infective Endocarditis ( 1.2 ) Skin and Skin Structure Infections ( 1.3 ) Bone Infections ( 1.4 ) Lower Respiratory Tract Infections ( 1.5 ) To reduce the development of drug-resistant bacteria and maintain the effectiveness of TYZAVAN and other antibacterial drugs, TYZAVAN should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria. ( 1.6 ) 1.1 Septicemia TYZAVAN is indicated in adults and pediatric patients (1 month and older) for whom appropriate dosing with this formulation can be achieved [see Dosage and Administration (2) and Use in Specific Populations (8.4) ] for the treatment of septicemia due to: Susceptible isolates of methicillin-resistant Staphylococcus aureus (MRSA) and coagulase negative staphylococci. Methicillin-susceptible staphylococci in penicillin-allergic patients, or those patients who cannot receive or who have failed to respond to other drugs, including penicillins or cephalosporins. 1.2 Infective Endocarditis TYZAVAN is indicated in adults and pediatric patients (1 month and older) for whom appropriate dosing with this formulation can be achieved [see Dosage and Administration (2) and Use in Specific Populations (8.4) ] for the treatment of infective endocarditis due to: Susceptible isolates of MRSA. Viridans group streptococci Streptococcus gallolyticus (previously known as Streptococcus bovis ), Enterococcus species and Corynebacterium species. For enterococcal endocarditis, use TYZAVAN in combination with an aminoglycoside. Methicillin-susceptible staphylococci in penicillin-allergic patients, or those patients who cannot receive or who have failed to respond to other drugs, including penicillins or cephalosporins. TYZAVAN is indicated in adults and pediatric patients (1 month and older) for whom appropriate dosing with this formulation can be achieved [see Dosage and Administration (2) and Use in Specific Populations (8.4) ] for the treatment of early-onset prosthetic valve endocarditis caused by Staphylococcus epidermidis in combination with rifampin and an aminoglycoside. 1.3 Skin and Skin Structure Infections TYZAVAN is indicated in adults and pediatric patients (1 month and older) for whom appropriate dosing with this formulation can be achieved [see Dosage and Administration (2) and Use in Specific Populations (8.4) ] for the treatment of skin and skin structure infections due to: Susceptible isolates of MRSA and coagulase negative staphylococci. Methicillin-susceptible staphylococci in penicillin-allergic patients, or those patients who cannot receive or who have failed to respond to other drugs, including penicillins or cephalosporins. 1.4 Bone Infections TYZAVAN is indicated in adults and pediatric patients (1 month and older) for whom appropriate dosing with this formulation can be achieved [see Dosage and Administration (2) and Use in Specific Populations (8.4) ] for the treatment of bone infections due to: Susceptible isolates of MRSA and coagulase negative staphylococci. Methicillin-susceptible staphylococci in penicillin-allergic patients, or those patients who cannot receive or who have failed to respond to other drugs, including penicillins or cephalosporins. 1.5 Lower Respiratory Tract Infections TYZAVAN is indicated in adults and pediatric patients (1 month and older) for whom appropriate dosing with this formulation can be achieved [see Dosage and Administration (2) and Use in Specific Populations (8.4) ] for the treatment of lower respiratory tract infections due to: Susceptible isolates of MRSA Methicillin-susceptible staphylococci in penicillin-allergic patients, or those patients who cannot receive or who have failed to respond to other drugs, including penicillins or cephalosporins. 1.6 Usage To reduce the development of drug-resistant bacteria and maintain the effectiveness TYZAVAN and other antibacterial drugs, TYZAVAN 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.

2 DOSAGE AND ADMINISTRATION If a dose of TYZAVAN is required that does not equal 500 mg, 750 mg, 1 g, 1.25 g, 1.5 g, 1.75 g or 2 g, this product is not recommended for use and an alternative formulation of vancomycin should be considered. ( 2.1 ). For intravenous use only. Do not administer orally ( 2.1 ). Administer TYZAVAN by intravenous infusion over 60 minutes or greater to reduce the risk of infusion reactions ( 2.1 ) Recommended Dosage in Adult Patients with Normal Renal Function: 2 g divided either as 0.5 grams (g) every 6 hours or 1 g every 12 hours ( 2.2 ) Recommended Dosage in Pediatric Patients (1 Month and Older) with Normal Renal Function: 10 mg/kg per dose given every 6 hours ( 2.3 ) Recommended Dosage in Patients with Renal Impairment: See full prescribing information for recommended doses in patients with renal impairment ( 2.4 ) See full prescribing information for further important preparation and administration instructions ( 2.1, 2.5 ) 2.1 Important Administration Instructions If a dose of TYZAVAN is required that does not equal 500 mg, 750 mg, 1 g, 1.25 g, 1.5 g, 1.75 g or 2 g, this product is not recommended for use and an alternative formulation of vancomycin should be considered. TYZAVAN is intended for intravenous use only. TYZAVAN is not to be administered orally. To reduce the risk of infusion related adverse reactions, administer TYZAVAN by intravenous infusion over 60 minutes or greater [see Warnings and Precautions (5.1) and Adverse Reactions (6.1) ] . An infusion rate of 10 mg/min or less is associated with fewer infusion-related adverse reactions [see Warnings and Precautions (5.1) ] . Infusion related adverse reactions may occur, however, at any rate or concentration. Drug additives should not be made to this solution. TYZAVAN concentrations of no more than 5 mg/mL are recommended in adults and pediatric patients (1 month and older) [see Dosage and Administration (2.2) ] . See also age-specific recommendations [see Dosage and Administration (2.3) ] . Administer TYZAVAN by a secure intravenous route of administration to reduce the risk of local irritation and phlebitis reactions [see Warnings and Precautions (5.8) ] . Administer TYZAVAN prior to intravenous anesthetic agents to reduce the risk of infusion related adverse reactions [see Warnings and Precautions (5.1) ] . 2.2 Recommended Dosage in Adult Patients with Normal Renal Function The usual daily intravenous dosage of TYZAVAN is 2 grams (g) divided either as 500 mg every 6 hours or 1 g every 12 hours. Administer each dose by intravenous infusion over a period of 60 minutes or greater. Other patient factors, such as age or obesity, may call for modification of the usual intravenous daily dose. The initial daily dose should be no less than 15 mg/kg. 2.3 Recommended Dosage in Pediatric Patients (1 Month and Older) with Normal Renal Function If a dose of TYZAVAN is required that does not equal 500 mg, 750 mg, 1 g, 1.25 g, 1.5 g, 1.75 g or 2 g, this product is not recommended for use and an alternative formulation of vancomycin should be considered [see Use in Specific Populations (8.4) ] . Pediatric Patients (Aged 1 Month and Older) The usual intravenous dosage of TYZAVAN 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. 2.4 Recommended Dosage in Adult Patients with Renal Impairment Dosage adjustment must be made in adult patients with renal impairment. The initial dose of TYZAVAN should be no less than 15 mg/kg in patients with any degree of renal impairment. In the elderly, greater dosage reductions than expected may be necessary because of decreased renal function. Measure trough vancomycin serum concentrations to guide therapy, especially in seriously ill patients with changing renal function. For functionally anephric patients, an initial dose of 15 mg/kg of body weight should be given to achieve prompt therapeutic serum concentration. A dose of 1.9 mg/kg/24 h should be given after the initial dose of 15 mg/kg. Measure vancomycin serum concentrations at 24 hours following the first dose to guide further intravenous therapy. 2.5 Administration and Preparation and Storage Instructions for TYZAVAN Administration Instructions TYZAVAN in transparent single-dose flexible bag is for intravenous administration only. Intermittent infusion is the recommended method of administration. TYZAVAN is a room temperature stable, ready-to-use drug product. Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit. Preparation for Intravenous Administration and Storage Instructions: 1. Remove the flexible bag from aluminum overpouch. 2. Check for minute leaks by squeezing the bag firmly. If leaks are detected, discard solution because sterility may be impaired. Leaks may be more readily detected by wrapping the bag with blotting paper or a tissue before squeezing. 3. Do not add supplemental medication. 4. Visually inspect the flexible bag. If the outlet port protector is damaged, detached, or not present, discard the flexible bag as solution path sterility may be impaired. If after visual inspection the solution is cloudy or if an insoluble precipitate is noted or if any seals are not intact, the flexible bag should be discarded. 5. The solution in the flexible bag remains chemically stable for 28 days at room temperature (15°C - 25°C (59°F – 77ºF)) after removal from the aluminum overpouch. Discard unused drug. 6. Suspend the flexible bag from eyelet support. 7. Remove protector from outlet port at bottom of flexible bag. 8. Attach administration set. Refer to complete directions accompanying set. 9. Use sterile equipment. Do not use flexible bags in series connections. Such use could result in an embolism due to residual air being drawn from the primary container before administration of the fluid from the secondary container is complete. 2.6 Incompatibilities for Intravenous Use Vancomycin solution has a low pH and may cause chemical or physical instability when it is mixed with other compounds. Mixtures of solutions of vancomycin and beta-lactam antibacterial drugs 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 antibacterial drugs.

4 CONTRAINDICATIONS TYZAVAN is contraindicated in patients with known hypersensitivity to vancomycin. Hypersensitivity to vancomycin ( 4 )

5 WARNINGS AND PRECAUTIONS Infusion Reactions : Hypotension, including shock and cardiac arrest, wheezing, dyspnea, urticaria, muscular and chest pain and “vancomycin infusion reactions” which manifests as pruritus and erythema that involves the face, neck and upper body may occur with rapid intravenous administration. To reduce the risk of infusion reactions, administer TYZAVAN over a period of 60 minutes or greater and also prior to intravenous anesthetic agents. ( 2.1, 5.1 ) Nephrotoxicity : Monitor renal function in all patients receiving TYZAVAN. ( 5.2 ) Ototoxicity : Serial tests of auditory function may be helpful. ( 5.3 ) Severe Dermatologic Reactions : Discontinue TYZAVAN at the first appearance of signs and symptoms of TEN, SJS, DRESS, AGEP, or LABD. ( 5.4 ) Clostridioides difficile -Associated Diarrhea (CDAD) : Evaluate patients if diarrhea occurs. ( 5.5 ). Neutropenia : Periodically monitor leukocyte count. ( 5.7 ) Phlebitis and Other Administration Site Reactions : Vancomycin is irritating to tissue and must be given by a secure intravenous route of administration. ( 5.8 ) 5.1 Infusion Reactions Hypotension, including shock and cardiac arrest, wheezing, dyspnea, urticaria or pruritus, muscular and chest pain may occur with rapid TYZAVAN administration (e.g., over several minutes). The reactions may be more severe in pediatric patients (1 month and older) [see Use in Specific Populations (8.4) ] . Rapid intravenous administration of TYZAVAN may also be associated with “vancomycin infusion reactions” which manifests as pruritus and erythema that involves the face, neck and upper body or pain and muscle spasm of the chest and back. There have been reports that the frequency of of infusion-related reactions (including hypotension, flushing, erythema, urticaria, and pruritus) increases with the concomitant administration of anesthetic agents. Infusion-related adverse reactions are related to both the concentration and the rate of administration of TYZAVAN. Infusion-related adverse reactions may occur, however, at any rate or concentration. Administer TYZAVAN over a period of 60 minutes or greater to reduce the risk of infusion-related adverse reactions. In selected patients in need of fluid restriction, a concentration up to 10 mg/mL may be used; use of such higher concentrations may increase the risk of infusion-related adverse reactions. Administer TYZAVAN as a 60-minute infusion prior to administration of intravenous anesthetic agents when feasible to minimize infusion-related adverse reactions. Stop the infusion if a reaction occurs because this usually results in prompt cessation of these reactions. 5.2 Nephrotoxicity TYZAVAN can result in acute kidney injury (AKI), including acute renal failure, mainly due to interstitial nephritis or less commonly acute tubular necrosis. AKI is manifested by increasing blood urea nitrogen (BUN) and serum creatinine (Cr). The risk of AKI increases with higher vancomycin serum levels, prolonged exposure, concomitant administration of other nephrotoxic drugs, concomitant administration of piperacillin-tazobactam [see Drug Interactions (7.2) ] , volume depletion, pre-existing renal impairment and in critically ill patients and patients with co-morbid conditions that predispose to renal impairment. Monitor serum vancomycin concentrations and renal function in all patients receiving TYZAVAN. More frequent monitoring is recommended in patients with comorbidities that predispose to impairment in renal function or are concomitantly receiving other nephrotoxic drugs, in critically ill patients, in patients with changing renal function, and in patients requiring higher therapeutic vancomycin levels. If acute kidney injury occurs, discontinue TYZAVAN or reduce the dose [see Dosage and Administration (2.4) ] . 5.3 Ototoxicity Ototoxicity has occurred in patients receiving vancomycin. It may be reversible or permanent. Ototoxicity manifests as tinnitus, hearing loss, dizziness or vertigo. The risk is higher in older patients, patients who are receiving higher doses, who have an underlying hearing loss, who are receiving concomitant therapy with another ototoxic agent, such as an aminoglycoside or who have underlying renal impairment. Monitor for signs and symptoms of ototoxicity during therapy. Monitor serum vancomycin concentrations and renal function in all patients receiving parenteral vancomycin. Discontinue TYZAVAN if ototoxicity occurs. Dosage of TYZAVAN must be adjusted for patients with renal impairment [see Dosage and Administration (2.3) ] . Serial tests of auditory function may be helpful in order to minimize the risk of ototoxicity . 5.4 Severe Dermatologic Reactions Severe dermatologic reactions such as toxic epidermal necrolysis (TEN), Stevens-Johnson syndrome (SJS), drug reaction with eosinophilia and systemic symptoms (DRESS), acute generalized exanthematous pustulosis (AGEP), and linear IgA bullous dermatosis (LABD) have been reported in association with the use of vancomycin. Cutaneous signs or symptoms reported include skin rashes (including exfoliative dermatitis), mucosal lesions, and blisters. Discontinue TYZAVAN at the first appearance of signs and symptoms of TEN, SJS, DRESS, AGEP, or LABD. 5.5 Clostridioides Difficile -Associated Diarrhea (CDAD) Clostridioides difficile -associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including vancomycin 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 antibacterial 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 antibacterial use 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. Prolonged use of TYZAVAN 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. 5.6 Hemorrhagic Occlusive Retinal Vasculitis (HORV) Hemorrhagic occlusive retinal vasculitis, including permanent loss of vision, occurred in patients receiving intracameral or intravitreal administration of vancomycin during or after cataract surgery. The safety and efficacy of vancomycin administered by the intracameral or the intravitreal route have not been established by adequate and well-controlled trials. Vancomycin is not indicated for the prophylaxis of endophthalmitis. 5.7 Neutropenia Reversible neutropenia has been reported in patients receiving vancomycin [see Adverse Reactions (6.1) ] . Patients who will undergo prolonged therapy with vancomycin or those who are receiving concomitant drugs that may cause neutropenia should have periodic monitoring of the leukocyte count. Reversible neutropenia, usually starting 1 week or more after onset of therapy with vancomycin or after a total dosage of more than 25 g, has been reported for several dozen patients. Neutropenia appears to be promptly reversible when vancomycin is discontinued. Thrombocytopenia has been reported. Although a causal relationship has not been established, reversible agranulocytosis (granulocytes <500/mm 3 ) has been reported. 5.8 Phlebitis and Other Administration Site Reactions Inflammation at the injection site has been reported. Vancomycin is irritating to tissue and must be given by a secure intravenous route of administration. Thrombophlebitis may occur, the frequency and severity of which can be minimized by slow infusion of the drug and by rotation of venous access sites. Administration of TYZAVAN by intramuscular (IM), intraperitoneal, intrathecal (intralumbar or intraventricular), or intravitreal routes has not been approved and is not recommended. The safety and efficacy of vancomycin administered by these routes of administration have not been established by adequate and well controlled trials. Pain, tenderness, and necrosis occur with intramuscular (IM) injection of vancomycin or with inadvertent extravasation. 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 of at least a 60-minute infusion prior to anesthetic induction. Administration of sterile vancomycin by the intraperitoneal route during continuous ambulatory peritoneal dialysis (CAPD) has been reported to result in chemical peritonitis. Manifestations of this syndrome range from a cloudy dialysate alone to a cloudy dialysate accompanied by variable degrees of abdominal pain and fever. This syndrome appears to be resolved after discontinuation of intraperitoneal vancomycin. About 60% of an intraperitoneal dose of vancomycin administered during peritoneal dialysis is absorbed systemically in 6 hours. Serum concentrations of about 10 mcg/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. 5.9 Development of Drug-Resistant Bacteria Prescribing TYZAVAN 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.

7 DRUG INTERACTIONS Anesthetic Agents : Concomitant administration of vancomycin and anesthetic agents has been associated with erythema and histamine-like flushing. ( 2.1 , 7.1 ) Piperacillin/Tazobactam : Increased incidence of acute kidney injury in patients receiving concomitant piperacillin/tazobactam and vancomycin as compared to vancomycin alone. Monitor kidney function in patients. ( 7.2 ) 7.1 Anesthetic Agents Concomitant administration of vancomycin and anesthetic agents has been associated with erythema and histamine-like flushing [see Warnings and Precautions (5.1) and Use in Specific Populations (8.4) ] . 7.2 Piperacillin-Tazobactam Studies have detected an increased incidence of acute kidney injury in patients administered concomitant piperacillin/tazobactam and vancomycin as compared to vancomycin alone. Monitor kidney function in patients receiving concomitant piperacillin/tazobactam and TYZAVAN. No pharmacokinetic interactions have been noted between piperacillin/tazobactam and vancomycin. 7.3 Ototoxic and/or Nephrotoxic Drugs Concurrent and/or sequential systemic or topical use of other potentially neurotoxic and/or nephrotoxic drugs with TYZAVAN requires more frequent monitoring of renal function.

6 ADVERSE REACTIONS The following clinically significant adverse reactions are described elsewhere in the labeling: Infusion Reactions [see Warnings and Precautions (5.1) ] Nephrotoxicity [see Warnings and Precautions (5.2) ] Ototoxicity [see Warnings and Precautions (5.3) ] Severe Dermatologic Reactions [see Warnings and Precautions (5.4) ] Clostridioides Difficile -Associated Diarrhea [see Warnings and Precautions (5.5) ] Hemorrhagic Occlusive Retinal Vasculitis [see Warnings and Precautions (5.6) ] Neutropenia [see Warnings and Precautions (5.7) ] Phlebitis and Other Administration Site Reactions [see Warnings and Precautions (5.8) ] The most common adverse reactions are anaphylaxis, “vancomycin infusion reactions”, acute kidney injury, hearing loss, neutropenia. ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Hikma Pharmaceuticals USA Inc. at 1-877-845-0689 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The following adverse reactions associated with the use of vancomycin were identified in clinical trials: Immune System Disorders: Anaphylaxis and “vancomycin infusion reaction” Renal and Urinary Disorders: Acute kidney injury and interstitial nephritis Ear and Labyrinth Disorders: Hearing loss, vertigo, and tinnitus Skin and Subcutaneous Tissue Disorders: Rashes including exfoliative dermatitis, and Stevens-Johnson syndrome (SJS) Gastrointestinal Disorders: Clostridioides difficile colitis, nausea Blood and Lymphatic System Disorders: Agranulocytosis, neutropenia, pancytopenia, leukopenia, thrombocytopenia, eosinophilia Cardiac Disorders: Cardiac arrest, chest pain General Disorders and Administration Site Conditions: General discomfort, fever, chills, phlebitis, injection site irritation, injection site pain and necrosis following intramuscular injection, chemical peritonitis following intraperitoneal administration (TYZAVAN is not approved for intramuscular and intraperitoneal administration) Laboratory Abnormalities: Elevated blood urea nitrogen, elevated serum creatinine Musculoskeletal and Connective Tissue Disorders: Muscle pain Nervous System Disorders: Dizziness Respiratory, Thoracic and Mediastinal Disorders: Wheezing, dyspnea Vascular Disorders: Hypotension, shock, vasculitis 6.2 Postmarketing Experience The following adverse reactions have been identified during postmarketing 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. Immune System Disorders: Acute myocardial ischemia with or without myocardial infarction may occur as part of an allergic reaction. Skin and Subcutaneous Tissue Disorders: Severe dermatologic reactions such as toxic epidermal necrolysis (TEN), drug reaction with eosinophilia and systemic symptoms (DRESS), acute generalized exanthematous pustulosis (AGEP), and linear IgA bullous dermatosis (LABD).

8.1 Pregnancy Risk Summary The available data on the use of this formulation of TYZAVAN (which includes the excipient NADA) in pregnant women are insufficient to evaluate for a drug-associated risk of major birth defects, miscarriage, or other adverse maternal or fetal outcomes (see Data ) . Available data over several decades of vancomycin (without the excipient NADA) use in pregnant women have not identified a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes (see Data ) . Vancomycin did not show adverse developmental effects when administered intravenously to pregnant rats and rabbits during organogenesis at doses less than or equal to the recommended maximum human dose (see Data ) . The background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively. Data Human Data Available data from postmarketing cases on use of this formulation of vancomycin injection (with the excipient NADA) in pregnant women are insufficient to evaluate for a drug-associated risk of major birth defects, miscarriage, or other adverse maternal or infant outcomes. There are no available data on first trimester use of vancomycin (without the excipient NADA); however, available published data on use in pregnancy during the second and third trimesters have not shown an association with adverse pregnancy related outcomes. A published study evaluated hearing loss and nephrotoxicity in infants of 10 pregnant intravenous drug users treated with intravenously administered vancomycin (formulation did not include the excipient NADA) for suspected or documented methicillin-resistant Staphylococcus aureus (MRSA) in the second or third trimester. The comparison groups were 10 non-intravenous drug-dependent patients who received no treatment, and 10 untreated intravenous drug-dependent patients who served as substance abuse controls. No infant in the vancomycin exposed group had abnormal sensorineural hearing at 3 months of age or nephrotoxicity. A published prospective study assessed outcomes in 55 pregnant women with a positive Group B streptococcus (GBS) culture and a high-risk penicillin allergy with resistance to clindamycin or unknown sensitivity who were administered vancomycin (formulation did not include the excipient NADA) at the time of delivery. Vancomycin dosing ranged from the standard 1 g intravenously every 12 hours to 20 mg/kg intravenous every 8 hours (maximum individual dose 2 g). No major adverse reactions were recorded either in the mothers or their newborns. None of the newborns had sensorineural hearing loss. Neonatal renal function was not examined, but all of the newborns were discharged in good condition. Animal Data Vancomycin did not cause fetal malformations when administered during organogenesis to pregnant rats (gestation days 6 to 15) and rabbits (gestation days 6 to 18) at doses less than or equal to the recommended maximum human dose (based on body surface area comparisons) of 200 mg/kg/day IV to rats or 120 mg/kg/day IV to rabbits. No effects on fetal weight or development were seen in rats at the highest dose tested or in rabbits given 80 mg/kg/day (approximately 1 and 0.8 times the recommended maximum human dose based on body surface area, respectively). Maternal toxicity was observed in rats (at doses 120 mg/kg and above) and rabbits (at 80 mg/kg and above). 1 Animal reproduction studies conducted in pregnant rabbits (gestation days 6 to 19) administered intravenous NADA at 1680 mg/kg (32 times the maximum daily human dose or greater based on AUC levels of NADA) resulted in fetal scoliosis and a spectrum of cardiovascular malformations. Increased incidence of delayed or incomplete ossifications of the metacarpals/metatarsals/phalanges and increased ossification (fused jugal/maxilla bones) were also observed in rabbits at 1680 mg/kg without maternal toxicity. No adverse developmental outcomes were observed in rabbits administered intravenous NADA at 560 mg/kg (11 times the maximum daily human dose based on AUC levels of NADA). In reproduction studies in pregnant rats (gestation days 6 to 17) administered intravenous NADA at 3780 mg/kg (20 times the maximum daily human dose based on AUC levels of NADA) no fetal adverse effects were observed. Maternal toxicity, including increased incidence of litter loss, was observed in rats at 3780 mg/kg [ see Clinical Pharmacology (12.3) ]. No animal studies have been conducted to evaluate the potential reproductive and embryo-fetal effects of TYZAVAN (with the excipient NADA).