Vancomycin (oral)

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# Overview
Vancomycin (oral) is a glycopeptide, antibiotics that is FDA approved for the treatment of C. difficile-associated diarrhea, enterocolitis caused by Staphylococcus aureus (including methicillin-resistant strains).   Common adverse reactions include nausea, vomiting, abdominal pain, diarrhea, and hypokalemia.

# Adult Indications and Dosage

## FDA-Labeled Indications and Dosage (Adult)
- Vancomycin CAPSULES are indicated for the treatment of C. difficile-associated diarrhea. Vancomycin CAPSULES are also used for the treatment of enterocolitis  caused by Staphylococcus aureus (including methicillin-resistant strains). Parenteral administration of vancomycin is not effective for the above infections; therefore, Vancomycin CAPSULES must be given orally for these infections.
- Orally administered Vancomycin is not effective for other types of infections.
- To reduce the development of drug-resistant bacteria  and maintain the effectiveness of Vancomycin CAPSULES and other antibacterial  drugs, Vancomycin CAPSULES should be used only to treat 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.
- Vancomycin CAPSULES are used in treating C. difficile-associated diarrhea and staphylococcal enterocolitis .
- C. difficile-associated diarrhea: The recommended dose is 125 mg administered orally 4 times daily for 10 days.
- Staphylococcal enterocolitis: Total daily dosage is 500 mg to 2 g administered orally in 3 or 4 divided doses for 7 to 10 days.

## Off-Label Use and Dosage (Adult)

### NonGuideline-Supported Use
- bacterial meningitis
- Peritoneal dialysis-associated peritonitis

# Pediatric Indications and Dosage

## FDA-Labeled Indications and Dosage (Pediatric)
- The usual daily dosage is 40 mg/kg in 3 or 4 divided doses for 7 to 10 days. The total daily dosage should not exceed 2 g.

## Off-Label Use and Dosage (Pediatric)

### Guideline-Supported Use
There is limited information regarding Off-Label Guideline-Supported Use of Vancomycin in pediatric  patients.

### NonGuideline-Supported Use
There is limited information regarding Off-Label NonGuideline-Supported Use of Vancomycin in pediatric  patients.

# Contraindications
- Vancomycin are contraindicated in patients with known hypersensitivity to vancomycin.

# Warnings
- This preparation for the treatment of colitis is for oral use only and is not systemically absorbed. Vancomycin CAPSULES must be given orally for treatment of staphylococcal enterocolitis  and Clostridium difficile-associated diarrhea. Orally administered Vancomycin CAPSULES are not effective for other types of infections.
- Parenteral administration of vancomycin is not effective for treatment of staphylococcal enterocolitis  and C. difficile-associated diarrhea. If parenteral vancomycin therapy is desired, use an intravenous preparation of vancomycin and consult the package insert accompanying that preparation.
- Clinically significant serum concentrations have been reported in some patients who have taken multiple oral doses of Vancomycin for active C. difficile-associated diarrhea. Some patients with inflammatory disorders of the intestinal mucosa also may have significant systemic absorption of vancomycin. These patients may be at risk for the development of adverse reactions associated with higher doses of Vancomycin; therefore, monitoring of serum concentrations of vancomycin may be appropriate in some instances, e.g., in patients with renal insufficiency and/or colitis or in those receiving concomitant therapy with an aminoglycoside antibiotic.
- Nephrotoxicity (e.g., reports of renal failure, renal impairment, blood creatinine increased) has occurred following oral Vancomycin therapy in randomized controlled clinical studies, and can occur either during or after completion of therapy. The risk of Nephrotoxicity is increased in patients >65 years of age.
- In patients >65 years of age, including those with normal renal function prior to treatment, renal function should be monitored during and following treatment with Vancomycin to detect potential vancomycin induced Nephrotoxicity.
- Ototoxicity has occurred in patients receiving vancomycin. It may be transient or permanent. It has been reported mostly in patients who have been given excessive intravenous doses, who have an underlying hearing loss, or who are receiving concomitant therapy with another ototoxic agent, such as an aminoglycoside. Serial tests of auditory function may be helpful in order to minimize the risk of ototoxicity.
- Use of Vancomycin may result in the overgrowth of nonsusceptible bacteria. If superinfection occurs during therapy, appropriate measures should be taken.
- Prescribing Vancomycin in the absence of a proven or strongly suspected bacterial infection is unlikely to provide benefit to the patient and increases the risk of the development of drug resistant bacteria.

# Adverse Reactions

## Clinical Trials Experience
- Because clinical studies are conducted under widely varying conditions, adverse reaction rates observed in the clinical studies of a drug cannot be directly compared to rates in the clinical studies of another drug and may not reflect the rates observed in practice.
- The data described below reflect exposure to Vancomycin in 260 adult subjects in two Phase 3 clinical trials for the treatment of diarrhea associated with C. difficile. In both trials, subjects received Vancomycin 125 mg orally four times daily. The mean duration of treatment was 9.4 days. The median age of patients was 67, ranging between 19 and 96 years of age. Patients were predominantly Caucasian (93%) and 52% were male.
- Adverse reactions occurring in  5% of Vancomycin-treated subjects are shown in TABLE 1. The most common adverse reactions associated with Vancomycin ( 10%) were nausea, abdominal pain, and hypokalemia.
- Nephrotoxicity (e.g., reports of renal failure, renal impairment, blood creatinine increased) occurred in 5% of subjects treated with Vancomycin. Nephrotoxicity following Vancomycin typically first occurred within one week after completion of treatment (median day of onset was Day 16). Nephrotoxicity following Vancomycin occurred in 6% of subjects >65 years of age and 3% of subjects 65 years of age.
- The incidences of hypokalemia, urinary tract infection, peripheral edema, insomnia, constipation, anemia, depression, vomiting, and hypotension were higher among subjects >65 years of age than in subjects 65 years of age.
- Discontinuation of study drug due to adverse events occurred in 7% of subjects treated with Vancomycin. The most common adverse events leading to discontinuation of Vancomycin were C. difficile colitis (<1%), nausea (<1%), and vomiting (<1%).

## Postmarketing Experience
- 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 always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
- Ototoxicity:
- Cases of hearing loss associated with intravenously administered vancomycin have been reported. Most of these patients had kidney dysfunction or a preexisting hearing loss or were receiving concomitant treatment with an ototoxic drug, Ototoxicity. Vertigo, dizziness, and tinnitus have been reported.
- Hematopoietic:
- Reversible neutropenia, usually starting 1 week or more after onset of intravenous therapy with vancomycin or after a total dose 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.
- Miscellaneous:
- Patients have been reported to have had anaphylaxis, drug fever, chills, nausea, eosinophilia, rashes (including exfoliative dermatitis), Stevens-Johnson syndrome, toxic epidermal necrolysis, and rare cases of vasculitis in association with the administration of vancomycin.
- A condition has been reported that is similar to the IV-induced syndrome with symptoms consistent with anaphylactoid reactions, including hypotension, wheezing, dyspnea, urticaria, pruritus, flushing of the upper body (Red Man Syndrome), pain and muscle spasm of the chest and back. These reactions usually resolve within 20 minutes but may persist for several hours.

# Drug Interactions
There is limited information regarding drug interactions of vancomycin capsule in the drug label.

# Use in Specific Populations

### Pregnancy
Pregnancy Category (FDA): C
- The highest doses of vancomycin tested were not teratogenic in rats given up to 200 mg/kg/day IV (1180 mg/m2 or 1 times the recommended maximum human dose based on body surface area) or in rabbits given up to 120 mg/kg/day IV (1320 mg/m2 or 1.1 times the recommended maximum human dose based body surface area). No effects on fetal weight or development were seen in rats at the highest dose tested or in rabbits given 80 mg/kg/day (880 mg/m2 or 0.74 times the recommended maximum human dose based on body surface area).
- In a controlled clinical study, the potential ototoxic and nephrotoxic effects of vancomycin on infants were evaluated when the drug was administered intravenously to pregnant women for serious staphylococcal infections complicating intravenous drug abuse. Vancomycin was found in cord blood. No sensorineural hearing loss or Nephrotoxicity attributable to vancomycin 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 subjects treated in this study was limited and vancomycin was administered only in the second and third trimesters, it is not known whether vancomycin causes fetal harm. Because animal reproduction studies are not always predictive of human response, Vancomycin should be given to a pregnant woman only if clearly needed.
Pregnancy Category (AUS):
- Australian Drug Evaluation Committee (ADEC) Pregnancy Category
There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of Vancomycin in women who are pregnant.

### Labor and Delivery
There is no FDA guidance on use of Vancomycin during labor and delivery.

### Nursing Mothers
- Vancomycin is excreted in human milk based on information obtained with the intravenous administration of vancomycin. However, systemic absorption of vancomycin is very low following oral administration of Vancomycin. It is not known whether vancomycin is excreted in human milk, as no studies of vancomycin concentration in human milk after oral administration have been done. Caution should be exercised when Vancomycin is administered to a nursing woman. Because of the potential for adverse events, a decision should be made whether to discontinue nursing or discontinue the drug, taking into account the importance of the drug to the mother.

### Pediatric Use
There is no FDA guidance on the use of Vancomycin with respect to pediatric  patients.

### Geriatic Use
- In clinical trials, 54% of Vancomycin-treated subjects were >65 years of age. Of these, 40% were between the ages of >65 and 75, and 60% were >75 years of age.
- Clinical studies with Vancomycin in diarrhea associated with Clostridium difficile have demonstrated that geriatric subjects are at increased risk of developing Nephrotoxicity  following treatment with oral Vancomycin, which may occur during or after completion of therapy. In patients >65 years of age, including those with normal renal function prior to treatment, renal function should be monitored during and following treatment with Vancomycin to detect potential vancomycin induced Nephrotoxicity.
- Patients >65 years of age may take longer to respond to therapy compared to patients 65 years of age. Clinicians should be aware of the importance of appropriate duration of Vancomycin treatment in patients >65 years of age and not discontinue or switch to alternative treatment prematurely.

### Gender
There is no FDA guidance on the use of Vancomycin with respect to specific gender populations.

### Race
There is no FDA guidance on the use of Vancomycin with respect to specific racial populations.

### Renal Impairment
There is no FDA guidance on the use of Vancomycin in patients with renal impairment.

### Hepatic Impairment
There is no FDA guidance on the use of Vancomycin in patients with hepatic impairment.

### Females of Reproductive Potential and Males
There is no FDA guidance on the use of Vancomycin in women of reproductive potentials and males.

### Immunocompromised Patients
There is no FDA guidance one the use of Vancomycin in patients who are immunocompromised.

# Administration and Monitoring

### Administration
- Oral
- Intravenous

### Monitoring

### Potential for Systemic Absorption=
- Clinically significant serum concentrations have been reported in some patients who have taken multiple oral doses of Vancomycin for active C. difficile-associated diarrhea. Some patients with inflammatory disorders of the intestinal mucosa also may have significant systemic absorption of vancomycin. These patients may be at risk for the development of adverse reactions associated with higher doses of Vancomycin; therefore, monitoring of serum concentrations of vancomycin may be appropriate in some instances, e.g., in patients with renal insufficiency and/or colitis or in those receiving concomitant therapy with an aminoglycoside antibiotic.
- Nephrotoxicity (e.g., reports of renal failure, renal impairment, blood creatinine increased) has occurred following oral Vancomycin therapy in randomized controlled clinical studies, and can occur either during or after completion of therapy. The risk of Nephrotoxicity is increased in patients >65 years of age.
- In patients >65 years of age, including those with normal renal function prior to treatment, renal function should be monitored during and following treatment with Vancomycin to detect potential vancomycin induced Nephrotoxicity.

# IV Compatibility
There is limited information regarding IV Compatibility of Vancomycin in the drug label.

# 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.
- 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.

# Pharmacology

## Mechanism of Action
- The bactericidal action of vancomycin against Staphylococcus aureus and the vegetative cells of Clostridium difficile results primarily from inhibition of cell wall biosynthesis. In addition, vancomycin alters bacteria l cell membrane permeability and RNA synthesis.

## Structure
- Vancomycin for oral administration contain chromatographically purified vancomycin hydrochloride, a tricyclic glycopeptide antibiotic derived from Amycolatopsis orientalis (formerly Nocardia orientalis), which has the chemical formula C66H75Cl2N9O24HCl. The molecular weight of vancomycin hydrochloride is 1485.73; 500 mg of the base is equivalent to 0.34 mmol.
- Vancomycin hydrochloride has the structural formula:

## Pharmacodynamics
There is limited information regarding Pharmacodynamics of Vancomycin in the drug label.

## Pharmacokinetics
- Vancomycin is poorly absorbed after oral administration. During multiple dosing of 250 mg every 8 hours for 7 doses, fecal concentrations of vancomycin in volunteers exceeded 100 mg/kg in the majority of samples. No blood concentrations were detected and urinary recovery did not exceed 0.76%. In anephric subjects with no inflammatory bowel disease who received vancomycin oral solution 2 g for 16 days, blood concentrations of vancomycin were less than or equal to 0.66 g/mL in 2 of 5 subjects. No measurable blood concentrations were attained in the other 3 subjects. Following doses of 2 g daily, concentrations of drug were >3100 mg/kg in the feces and <1 g/mL in the serum of subjects with normal renal function who had C. difficile-associated diarrhea. After multiple-dose oral administration of vancomycin, measurable serum concentrations may occur in patients with active C. difficile-associated diarrhea, and, in the presence of renal impairment, the possibility of accumulation exists. It should be noted that the total systemic and renal clearances of vancomycin are reduced in the elderly.

## Nonclinical Toxicology

### Carcinogenesis, Mutagenesis, Impairment of Fertility=
- No long-term carcinogenesis studies in animals have been conducted.
- At concentrations up to 1000 g/mL, vancomycin had no mutagenic effect in vitro in the mouse lymphoma forward mutation assay or the primary rat hepatocyte unscheduled DNA synthesis assay. The concentrations tested in vitro were above the peak plasma vancomycin concentrations of 20 to 40 g/mL usually achieved in humans after slow infusion of the maximum recommended dose of 1 g. Vancomycin had no mutagenic effect in vivo in the Chinese hamster sister chromatid exchange assay (400 mg/kg IP) or the mouse micronucleus assay (800 mg/kg IP).
- No definitive fertility studies have been conducted.

# Clinical Studies

### Diarrhea Associated with Clostridium difficile=
- In two trials, Vancomycin 125 mg orally four times daily for 10 days was evaluated in 266 adult subjects with C. difficile-associated diarrhea (CDAD). Enrolled subjects were 18 years of age or older and received no more than 48 hours of treatment with oral Vancomycin or oral/intravenous metronidazole in the 5 days preceding enrollment. CDAD was defined as 3 loose or watery bowel movements within the 24 hours preceding enrollment, and the presence of either C. difficile toxin A or B, or pseudomembranes on endoscopy within the 72 hours preceding enrollment. Subjects with fulminant C. difficile disease, sepsis with hypotension, ileus, peritoneal signs or severe hepatic disease were excluded.
- Efficacy analyses were performed on the Full Analysis Set (FAS), which included randomized subjects who received at least one dose of Vancomycin and had any post-dosing investigator evaluation data (N=259; 134 in Trial 1 and 125 in Trial 2).
- The demographic profile and baseline CDAD characteristics of enrolled subjects were similar in the two trials. Vancomycin-treated subjects had a median age of 67 years, were mainly white (93%), and male (52%). CDAD was classified as severe (defined as 10 or more unformed bowel movements per day or WBC 15000/mm3) in 25% of subjects, and 47% were previously treated for CDAD.
- Efficacy was assessed by using clinical success, defined as diarrhea resolution and the absence of severe abdominal discomfort due to CDAD, on Day 10. An additional efficacy endpoint was the time to resolution of diarrhea, defined as the beginning of diarrhea resolution that was sustained through the end of the prescribed active treatment period.
- The results for clinical success for Vancomycin-treated subjects in both trials are shown in TABLE 2.
- The median time to resolution of diarrhea was 5 days and 4 days in Trial 1 and Trial 2, respectively. For subjects older than 65 years of age, the median time to resolution was 6 days and 4 days in Trial 1 and Trial 2, respectively. In subjects with diarrhea resolution at end-of-treatment with Vancomycin, recurrence of CDAD during the following four weeks occurred in 25 of 107 (23%) and 18 of 102 (18%) in Trial 1 and Trial 2, respectively.
- Restriction Endonuclease Analysis (REA) was used to identify C. difficile baseline isolates in the BI group. In Trial 1, the Vancomycin-treated subjects were classified at baseline as follows 31 (23%) with BI strain, 69 (52%) with non-BI strain, and 34 (25%) with unknown strain.  Clinical success rates were 87% for BI strain, 81% for non-BI strain, and 76% for unknown strain.  In subjects with diarrhea resolution at end-of-treatment with Vancomycin, recurrence of CDAD during the following four weeks occurred in 7 of 26 subjects with BI strain, 12 of 56 subjects with non-BI strain, and 6 of 25 subjects with unknown strain.

# How Supplied
- Vancomycin CAPSULES are available in:
- The 125 mg- capsules have an opaque blue cap and opaque brown body imprinted with 3125 on the cap and Vancomycin HCL 125 MG on the body in white ink. A carton contains 2 blister packs. Each blister pack contains 10 capsules for a total of 20 capsules per carton. NDC No. 62559-310-20.
- The 250 mg- capsules have an opaque blue cap and opaque lavender body imprinted with 3126 on the cap and Vancomycin HCL 250 MG on the body in white ink. A carton contains 2 blister packs. Each blister pack contains 10 capsules for a total of 20 capsules per carton. NDC No. 62559-311-20.

## Storage
- Store at controlled room temperature, 59 to 86F (15 to 30C).

# Images

## Drug Images

## Package and Label Display Panel

# Patient Counseling Information
- Patients should be counseled that antibacterial drugs including Vancomycin should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When Vancomycin 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 or other antibacterial drugs in the future.
- VANCOCIN is a registered U.S. trademark owned by ANI Pharmaceuticals, Inc.
- Rx Only
- Distributed by:
- ANI Pharmaceuticals, Inc.
- Baudette, MN 56623

# Precautions with Alcohol
- Alcohol-Vancomycin interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.

# Brand Names
- Vancocin HCl Pulvules
- Vancocin HCl
- Vancoled

# Look-Alike Drug Names
- IV VANC  - INVANZ

# Drug Shortage Status

# Price