Vantin Generic Name: cefpodoxmine proxetil Brand Name: Vantin Drug Class: Cephalosporins, 3rd Generation side effects drug center vantin (cefpodoxmine proxetil) drug Related Drugs Rocephin Drug Comparison Suprax vs. Vantin Vantin vs. Amoxicillin Vantin vs. Zithromax Vantin User Reviews PROFESSIONAL CONSUMER SIDE EFFECTS Contents Drug Description Indications Dosage Side Effects Drug Interactions Warnings Precautions Overdosage & Contraindications Clinical Pharmacology Medication Guide Drug Description What is Vantin and how is it used? Vantin is a prescription medicine used to treat the symptoms of various bacterial infections such as bronchitis, pneumonia, sinusitis, pharyngitis, tonsillitis, urinary tract infections, skin infections and gonorrhea. Vantin may be used alone or with other medications. Vantin belongs to a class of drugs called Caphalosporins, 3rd Generation. It is not known if Vantin is safe and effective in children younger than 2 months of age. What are the possible side effects of Vantin? Vantin may cause serious side effects including: hives, difficulty breathing, swelling of your face, lips, tongue, or throat, fever, sore throat, burning in your eyes, skin pain, red or purple skin rash that spreads and causes blistering and peeling, severe stomach pain, diarrhea that is watery or bloody, swollen glands, joint pain, general ill feeling, pounding heartbeats, fluttering in your chest, shortness of breath, and seizure Get medical help right away, if you have any of the symptoms listed above. The most common side effects of Vantin include: vaginal itching or discharge, diaper rash in an infant using this medicine, nausea, vomiting, diarrhea, stomach pain, and headache Tell the doctor if you have any side effect that bothers you or that does not go away. These are not all the possible side effects of Vantin. For more information, ask your doctor or pharmacist. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. To reduce the development of drug-resistant bacteria and maintain the effectiveness of VANTIN and other antibacterial drugs, VANTIN should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria. DESCRIPTION Cefpodoxime proxetil is an orally administered, extended spectrum, semi-synthetic antibiotic of the cephalosporin class. The chemical name is (RS)-1(isopropoxycarbonyloxy) ethyl (+)-(6R,7R)-7-[2-(2-amino-4-thiazolyl)-2-{(Z)methoxyimino}acetamido]-3-methoxymethyl-8-oxo-5-thia-1-azabicyclo [4.2.0]oct-2-ene- 2-carboxylate. Its empirical formula is C21H27N5O9S2 and its structural formula is represented below: The molecular weight of cefpodoxime proxetil is 557,6. Cefpodoxime proxetil is a prodrug; its active metabolite is cefpodoxime. All doses of cefpodoxime proxetil in this insert are expressed in terms of the active cefpodoxime moiety. The drug is supplied both as film-coated tablets and as flavored granules for oral suspension. VANTIN Tablets contain cefpodoxime proxetil equivalent to 100 mg or 200 mg of cefpodoxime activity and the following inactive ingredients: carboxymethylcellulose calcium, carnauba wax, FD&C Yellow No. 6, hydroxypropylcellulose, hypromellose, lactose hydrous, magnesium stearate, propylene glycol, sodium lauryl sulfate and titanium dioxide. In addition, the 100 mg film-coated tablets contain D&C Yellow No. 10 and the 200 mg film-coated tablets contain FD&C Red No. 40. Each 5 mL of VANTIN Oral Suspension contains cefpodoxime proxetil equivalent to 50 mg or 100 mg of cefpodoxime activity after constitution and the following inactive ingredients: artificial flavorings, butylated hydroxy anisole (BHA), carboxymethylcellulose sodium, microcrystalline cellulose, carrageenan, citric acid, colloidal silicon dioxide, croscarmellose sodium, hydroxypropylcellulose, lactose, maltodextrin, natural flavorings, propylene glycol alginate, sodium citrate, sodium benzoate, starch, sucrose, and vegetable oil. Indications INDICATIONS Cefpodoxime proxetil is indicated for the treatment of patients with mild to moderate infections caused by Susceptible strains of the designated microorganisms in the conditions listed below. Recommended dosages, durations of therapy, and applicable patient populations vary among these infections. Please see DOSAGE AND ADMINISTRATION for specific recommendations. Acute otitis media caused by Streptococcus pneumoniae (excluding penicillin-resistant strains), Streptococcus pyogenes, Haemophilus influenzae (including beta-lactamase-producing strains), or Moraxella (Branhamella) catarrhalis (including beta-lactamase-producing strains). Pharyngitis And/Or tonsillitis caused by Streptococcus pyogenes. NOTE: Only penicillin by the intramuscular route of administration has been shown to be effective in the prophylaxis of rheumatic fever. Cefpodoxime proxetil is generally effective in the eradication of streptococci from the oropharynx. However, data establishing the efficacy of cefpodoxime proxetil for the prophylaxis of subsequent rheumatic fever are not available. Community-acquired pneumonia caused by S. pneumoniae or H. Influenzae (including beta-lactamaseproducing strains). Acute bacterial exacerbation of chronic bronchitis caused by S. pneumoniae, H. influenzae (non-betalactamase- producing strains only), or M. catarrhalis. Data are insufficient at this time to establish efficacy in patients with acute bacterial exacerbations of chronic bronchitis caused by beta-lactamase-producing strains of H. influenzae. Acute, uncomplicated urethral and cervical gonorrhea caused by Neisseria gonorrhoeae (including penicillinase-producing strains). Acute, uncomplicated ano-rectal infections in women due to Neisseria gonorrhoeae (including penicillinase-producing strains). NOTE: The efficacy of cefpodoxime in treating male patients with rectal infections caused by N. gonorrhoeae has not been established. Data do not support the use of cefpodoxime proxetil in the treatment of pharyngeal infections due to N. gonorrhoeae in men or women. Uncomplicated skin and skin structure infections caused by Staphylococcus aureus (including penicillinase-producing strains) or Streptococcus pyogenes. Abscesses should be surgically drained as clinically indicated. NOTE: In clinical trials, successful treatment of uncomplicated skin and skin structure infections was doserelated. The effective therapeutic dose for skin infections was higher than those used in other recommended indications. (See DOSAGE AND ADMINISTRATION.) Acute maxillary sinusitis caused by Haemophilus influenzae (including beta-lactamase-producing strains), Streptococcus pneumoniae, and Moraxella catarrhalis. Uncomplicated urinary tract infections (cystitis) caused by Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, or Staphylococcus saprophyticus. NOTE: In considering the use of cefpodoxime proxetil in the treatment of cystitis, cefpodoxime proxetil's lower bacterial eradication rates should be weighed against the increased eradication rates and different safety profiles of some other classes of approved agents. (See Clinical Studies section.) Appropriate specimens for bacteriological examination should be obtained in order to isolate and identify causative organisms and to determine their susceptibility to cefpodoxime. Therapy may be instituted while awaiting the results of these studies. Once these results become available, antimicrobial therapy should be adjusted accordingly. To reduce the development of drug-resistant bacteria and maintain the effectiveness of VANTIN and other antibacterial drugs, VANTIN 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. Dosage DOSAGE AND ADMINISTRATION (See INDICATIONS AND USAGE for indicated pathogens.) Film-Coated Tablets VANTIN Tablets should be administered orally with food to enhance absorption. (See CLINICAL PHARMACOLOGY.) The recommended dosages, durations of treatment, and applicable patient population are as described in the following chart: Adults and Adolescents (age 12 years and older) Type of Infection Total Daily Dose Dose Frequency Duration Pharyngitis and/or tonsillitis 200 mg 100 mg Q 12 hours 5 to 10 days Acute community-acquired pneumonia 400 mg 200 mg Q 12 hours 14 days Acute bacterial exacerbations of chronic bronchitis 400 mg 200 mg Q 12 hours 10 days Uncomplicated gonorrhea (men and women) and rectal gonococcal infections (women) 200 mg single dose Skin and skin structure 800 mg 400 mg Q 12 hours 7 to 14 days Acute maxillary sinusitis 400 mg 200 mg Q 12 hours 10 days Uncomplicated urinary tract infection 200 mg 100 mg Q 12 hours 7 days Granules For Oral Suspension VANTIN Oral Suspension may be given without regard to food. The recommended dosages, durations of treatment, and applicable patient populations are as described in the following chart: Adults and Adolescents (age 12 years and older) Type of Infection Total Daily Dose Dose Frequency Duration Pharyngitis and/or tonsillitis 200 mg 100 mg Q 12 hours 5 to 10 days Acute community-acquired pneumonia 400 mg 200 mg Q 12 hours 14 days Uncomplicated gonorrhea (men and women) and rectal gonococcal infections (women) 200 mg single dose Skin and skin structure 800 mg 400 mg Q 12 hours 7 to 14 days Acute maxillary sinusitis 400 mg 200 mg Q 12 hours 10 days Uncomplicated urinary tract infection 200 mg 100 mg Q 12 hours 7 days Infants and Pediatric Patients (age 2 months through 12 years) Type of Infection Total Daily Dose Dose Frequency Duration Acute otitis media 10 mg/kg/day (Max 400 mg/day) 5 mg/kg Q 12 h (Max 200 mg/dose) 5 days Pharyngitis and/or tonsillitis 10 mg/kg/day (Max 200 mg/day) 5 mg/kg/dose Q 12 h (Max 100 mg/dose) 5 to 10 Acute maxillary sinusitis 10 mg/kg/day (Max 400 mg/day) 5 mg/kg Q 12 hours (Max 200 mg/dose) days 10 days Patients With Renal Dysfunction For patients with severe renal impairment ( < 30 mL/min creatinine clearance), the dosing intervals should be increased to Q 24 hours. In patients maintained on hemodialysis, the dose frequency should be 3 times/week after hemodialysis. When only the serum creatinine level is available, the following formula (based on sex, weight, and age of the patient) may be used to estimate creatinine clearance (mL/min). For this estimate to be valid, the serum creatinine level should represent a steady state of renal function. Males (mL/min): Weight (kg) x (140 - age)/ 72 x serum creatinine (mg/100 mL) Females (mL/min): 0.85 x above value Patients With Cirrhosis Cefpodoxime pharmacokinetics in cirrhotic patients (with or without ascites) are similar to those in healthy subjects. Dose adjustment is not necessary in this population. Preparation Of Suspension Constitution Directions For Oral Suspension Constituted Volume Final Concentration Directions 50 mL 50 mg per 5 mL Suspend in a total of 29 mL of distilled water. Method: First, shake the bottle to loosen granules. Then add the water in two approximately equal portions, shaking vigorously after each aliquot of water. 75 mL 50 mg per 5 mL Suspend in a total of 44 mL of distilled water. Method: First, shake the bottle to loosen granules. Then add the water in two approximately equal portions, shaking vigorously after each aliquot of water. 100 mL 50 mg per 5 mL Suspend in a total of 58 mL of distilled water. Method: First, shake the bottle to loosen granules. Then add the water in two approximately equal portions, shaking vigorously after each aliquot of water. 50 mL 100 mg per 5 mL Suspend in a total of 29 mL of distilled water. Method: First, shake the bottle to loosen granules. Then add the water in two approximately equal portions, shaking vigorously after each aliquot of water. 75 mL 100 mg per 5 mL Suspend in a total of 43 mL of distilled water. Method: First, shake the bottle to loosen granules. Then add the water in two approximately equal portions, shaking vigorously after each aliquot of water. 100 mL 100 mg per 5 mL Suspend in a total of 57 mL of distilled water. Method: First, shake the bottle to loosen granules. Then add the water in two approximately equal portions, shaking vigorously after each aliquot of water. After mixing, the suspension should be stored in a refrigerator, 2° to 8°C (36° to 46°F). Shake well before using. Keep container tightly closed. The mixture may be used for 14 days. Discard unused portion after 14 days. HOW SUPPLIED VANTIN Tablets are available in the following strengths (cefpodoxime equivalent), colors, and sizes: 100 mg (light orange, elliptical, debossed with U3617) Bottles of 20 NDC 0009-3617-01 Bottles of 100 NDC 0009-3617-02 Unit dose packs of 100 NDC 0009-3617-03 200 mg (coral red, elliptical, debossed with U3618) Bottles of 20 NDC 0009-3618-01 Bottles of 100 NDC 0009-3618-02 200 mg (coral red, elliptical, debossed with U3618) Unit dose packs of 100 NDC 0009-3618-03 Store tablets at controlled room temperature 20° to 25°C (68° to 77°F) [see USP]. Replace cap securely after each opening. Protect unit dose packs from excessive moisture. VANTIN Oral Suspension provides the equivalent of 50 mg or 100 mg cefpodoxime per 5 mL suspension (when constituted as directed) and is available in lemon creme flavor in the following sizes: 50 mg/5 mL 100-mL suspension NDC 0009-3531-01 75-mL suspension NDC 0009-3531-02 50-mL suspension NDC 0009-3531-03 100 mg/5 mL 100-mL suspension NDC 0009-3615-01 75-mL suspension NDC 0009-3615-02 50-mL suspension NDC 0009-3615-03 Store unsuspended granules at controlled room temperature 20° to 25°C (68° to 77°F) [see USP]. Directions for mixing are included on the label. After mixing, suspension should be stored in a refrigerator, 2° to 8°C (36° to 46°F). Shake well before using. Keep container tightly closed. The mixture may be used for 14 days. Discard unused portion after 14 days. Distributed by: Pharmacia & Upjohn Company, Division of Pfizer Inc., NY, NY 10017. Revised: Aug 2016 Side Effects SIDE EFFECTS Clinical Trials Film-coated Tablets (Multiple dose) In clinical trials using multiple doses of cefpodoxime proxetil film-coated tablets, 4696 patients were treated with the recommended dosages of cefpodoxime (100 to 400 mg Q 12 hours). There were no deaths or permanent disabilities thought related to drug toxicity. One-hundred twenty-nine (2.7%) patients discontinued medication due to adverse events thought possibly or probably related to drug toxicity. Ninety-three (52%) of the 178 patients who discontinued therapy (whether thought related to drug therapy or not) did so because of gastrointestinal disturbances, nausea, vomiting, or diarrhea. The percentage of cefpodoxime proxetil-treated patients who discontinued study drug because of adverse events was significantly greater at a dose of 800 mg daily than at a dose of 400 mg daily or at a dose of 200 mg daily. Adverse events thought possibly or probably related to cefpodoxime in multiple-dose clinical trials (N=4696 cefpodoxime-treated patients) were: Incidence Greater Than 1% Diarrhea 7.0% Diarrhea or loose stools were dose-related: decreasing from 10.4% of patients receiving 800 mg per day to 5.7% for those receiving 200 mg per day. Of patients with diarrhea, 10% had C. difficile organism or toxin in the stool. (See WARNINGS.) Nausea 3.3% Vaginal Fungal Infections 1.0% Vulvovaginal Infections 1.3% Abdominal Pain 1.2% Headache 1.0% Incidence Less Than 1% By body system in decreasing order Clinical Studies Adverse Events Thought Possibly Or Probably Related To Cefpodoxime Proxetil That Occurred In Less Than 1% Of Patients (N=4696) Body - fungal infections, abdominal distention, malaise, fatigue, asthenia, fever, chest pain, back pain, chills, generalized pain, abnormal microbiological tests, moniliasis, abscess, allergic reaction, facial edema, bacterial infections, parasitic infections, localized edema, localized pain. Cardiovascular - congestive heart failure, migraine, palpitations, vasodilation, hematoma, hypertension, hypotension. Digestive - vomiting, dyspepsia, dry mouth, flatulence, decreased appetite, constipation, oral moniliasis, anorexia, eructation, gastritis, mouth ulcers, gastrointestinal disorders, rectal disorders, tongue disorders, tooth disorders, increased thirst, oral lesions, tenesmus, dry throat, toothache. Hemic and Lymphatic - anemia. Metabolic and Nutritional - dehydration, gout, peripheral edema, weight increase. Musculo-skeletal - myalgia. Nervous - dizziness, insomnia, somnolence, anxiety, shakiness, nervousness, cerebral infarction, change in dreams, impaired concentration, confusion, nightmares, paresthesia, vertigo. Respiratory - asthma, cough, epistaxis, rhinitis, wheezing, bronchitis, dyspnea, pleural effusion, pneumonia, sinusitis. Skin - urticaria, rash, pruritus non-application site, diaphoresis, maculopapular rash, fungal dermatitis, desquamation, dry skin non-application site, hair loss, vesiculobullous rash, sunburn. Special Senses - taste alterations, eye irritation, taste loss, tinnitus. Urogenital - hematuria, urinary tract infections, metrorrhagia, dysuria, urinary frequency, nocturia, penile infection, proteinuria, vaginal pain. Granules For Oral Suspension (Multiple dose) In clinical trials using multiple doses of cefpodoxime proxetil granules for oral suspension, 2128 pediatric patients (93% of whom were less than 12 years of age) were treated with the recommended dosages of cefpodoxime (10 mg/kg/day Q 24 hours or divided Q 12 hours to a maximum equivalent adult dose). There were no deaths or permanent disabilities in any of the patients in these studies. Twenty-four patients (1.1%) discontinued medication due to adverse events thought possibly or probably related to study drug. Primarily, these discontinuations were for gastrointestinal disturbances, usually diarrhea, vomiting, or rashes. Adverse events thought possibly or probably related, or of unknown relationship to cefpodoxime proxetil for oral suspension in multiple-dose clinical trials (N=2128 patients treated with cefpodoxime) were: Incidence Greater Than 1% Diarrhea 6.0% The incidence of diarrhea in infants and toddlers (age 1 month to 2 years) was 12.8%. Diaper rash/Fungal skin rash 2.0% (includes moniliasis) The incidence of diaper rash in infants and toddlers was 8.5%. Other skin rashes 1.8% Vomiting 2.3% Incidence Less Than 1% Body: Localized abdominal pain, abdominal cramp, headache, monilia, generalized abdominal pain, asthenia, fever, fungal infection. Digestive: Nausea, monilia, anorexia, dry mouth, stomatitis, pseudomembranous colitis. Hemic & Lymphatic: Thrombocythemia, positive direct Coombs' test, eosinophilia, leukocytosis, leukopenia, prolonged partial thromboplastin time, thrombocytopenic purpura. Metabolic & Nutritional: Increased SGPT. Musculo-Skeletal: Myalgia. Nervous: Hallucination, hyperkinesia, nervousness, somnolence. Respiratory: Epistaxis, rhinitis. Skin: Skin moniliasis, urticaria, fungal dermatitis, acne, exfoliative dermatitis, maculopapular rash. Special Senses: Taste perversion. Film-coated Tablets (Single dose) In clinical trials using a single dose of cefpodoxime proxetil film-coated tablets, 509 patients were treated with the recommended dosage of cefpodoxime (200 mg). There were no deaths or permanent disabilities thought related to drug toxicity in these studies. Adverse events thought possibly or probably related to cefpodoxime in single-dose clinical trials conducted in the United States were: Incidence Greater Than 1% Nausea 1.4% Diarrhea 1.2% Incidence Less Than 1% Central Nervous System: Dizziness, headache, syncope. Dermatologic: Rash. Genital: Vaginitis. Gastrointestinal: Abdominal pain. Psychiatric: Anxiety. Laboratory Changes Significant laboratory changes that have been reported in adult and pediatric patients in clinical trials of cefpodoxime proxetil, without regard to drug relationship, were: Hepatic: Transient increases in AST (SGOT), ALT (SGPT), GGT, alkaline phosphatase, bilirubin, and LDH. Hematologic: Eosinophilia, leukocytosis, lymphocytosis, granulocytosis, basophilia, monocytosis, thrombocytosis, decreased hemoglobin, decreased hematocrit, leukopenia, neutropenia, lymphocytopenia, thrombocytopenia, thrombocythemia, positive Coombs' test, and prolonged PT, and PTT. Serum Chemistry: Hyperglycemia, hypoglycemia, hypoalbuminemia, hypoproteinemia, hyperkalemia, and hyponatremia. Renal: Increases in BUN and creatinine. Most of these abnormalities were transient and not clinically significant. Post Marketing Experience The following serious adverse experiences have been reported: allergic reactions including Stevens-Johnson syndrome, toxic epidermal necrolysis, erythema multiforme and serum sickness-like reactions, pseudomembranous colitis, bloody diarrhea with abdominal pain, ulcerative colitis, rectorrhagia with hypotension, anaphylactic shock, acute liver injury, in utero exposure with miscarriage, purpuric nephritis, pulmonary infiltrate with eosinophilia, and eyelid dermatitis. One death was attributed to pseudomembranous colitis and disseminated intravascular coagulation. Cephalosporin Class Labeling In addition to the adverse reactions listed above which have been observed in patients treated with cefpodoxime proxetil, the following adverse reactions and altered laboratory tests have been reported for cephalosporin class antibiotics: Adverse Reactions and Abnormal Laboratory Tests: Renal dysfunction, toxic nephropathy, hepatic dysfunction including cholestasis, aplastic anemia, hemolytic anemia, serum sickness-like reaction, hemorrhage, agranulocytosis, and pancytopenia. Several cephalosporins have been implicated in triggering seizures, particularly in patients with renal impairment when the dosage was not reduced. (See DOSAGE AND ADMINISTRATION and OVERDOSAGE.) If seizures associated with drug therapy occur, the drug should be discontinued. Anticonvulsant therapy can be given if clinically indicated. Drug Interactions DRUG INTERACTIONS Antacids Concomitant administration of high doses of antacids (sodium bicarbonate and aluminum hydroxide) or H2 blockers reduces peak plasma levels by 24% to 42% and the extent of absorption by 27% to 32%, respectively. The rate of absorption is not altered by these concomitant medications. Oral anti-cholinergics (e.g., propantheline) delay peak plasma levels (47% increase in Tmax), but do not affect the extent of absorption (AUC). Probenecid As with other beta-lactam antibiotics, renal excretion of cefpodoxime was inhibited by probenecid and resulted in an approximately 31% increase in AUC and 20% increase in peak cefpodoxime plasma levels. Nephrotoxic Drugs Although nephrotoxicity has not been noted when cefpodoxime proxetil was given alone, close monitoring of renal function is advised when cefpodoxime proxetil is administered concomitantly with compounds of known nephrotoxic potential. Drug/Laboratory Test Interactions Cephalosporins, including cefpodoxime proxetil, are known to occasionally induce a positive direct Coombs' test. Warnings WARNINGS BEFORE THERAPY WITH CEFPODOXIME PROXETIL IS INSTITUTED, CAREFUL INQUIRY SHOULD BE MADE TO DETERMINE WHETHER THE PATIENT HAS HAD PREVIOUS HYPERSENSITIVITY REACTIONS TO CEFPODOXIME, OTHER CEPHALOSPORINS, PENICILLINS, OR OTHER DRUGS. IF CEFPODOXIME IS TO BE ADMINISTERED TO PENICILLIN SENSITIVE PATIENTS, CAUTION SHOULD BE EXERCISED BECAUSE CROSS HYPERSENSITIVITY AMONG BETA-LACTAM ANTIBIOTICS HAS BEEN CLEARLY DOCUMENTED AND MAY OCCUR IN UP TO 10% OF PATIENTS WITH A HISTORY OF PENICILLIN ALLERGY. IF AN ALLERGIC REACTION TO CEFPODOXIME PROXETIL OCCURS, DISCONTINUE THE DRUG. SERIOUS ACUTE HYPERSENSITIVITY REACTIONS MAY REQUIRE TREATMENT WITH EPINEPHRINE AND OTHER EMERGENCY MEASURES, INCLUDING OXYGEN, INTRAVENOUS FLUIDS, INTRAVENOUS ANTIHISTAMINE, AND AIRWAY MANAGEMENT, AS CLINICALLY INDICATED. Clostridium difficile associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including VANTIN, 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. A concerted effort to monitor for C. difficile in cefpodoxime-treated patients with diarrhea was undertaken because of an increased incidence of diarrhea associated with C. difficile in early trials in normal subjects. C. difficile organisms or toxin was reported in 10% of the cefpodoxime-treated adult patients with diarrhea; however, no specific diagnosis of pseudomembranous colitis was made in these patients. In post-marketing experience outside the United States, reports of pseudomembranous colitis associated with the use of cefpodoxime proxetil have been received. Precautions PRECAUTIONS General In patients with transient or persistent reduction in urinary output due to renal insufficiency, the total daily dose of cefpodoxime proxetil should be reduced because high and prolonged serum antibiotic concentrations can occur in such individuals following usual doses. Cefpodoxime, like other cephalosporins, should be administered with caution to patients receiving concurrent treatment with potent diuretics. (See DOSAGE AND ADMINISTRATION.) As with other antibiotics, prolonged use of cefpodoxime proxetil may result in overgrowth of non-Susceptible organisms. Repeated evaluation of the patient's condition is essential. If superinfection occurs during therapy, appropriate measures should be taken. Prescribing VANTIN 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 drugresistant bacteria. Carcinogenesis, Mutagenesis, Impairment Of Fertility Long-term animal carcinogenesis studies of cefpodoxime proxetil have not been performed. Mutagenesis studies of cefpodoxime, including the Ames test both with and without metabolic activation, the chromosome aberration test, the unscheduled DNA synthesis assay, mitotic recombination and gene conversion, the forward gene mutation assay and the in vivo micronucleus test, were all negative. No untoward effects on fertility or reproduction were noted when 100 mg/kg/day or less (2 times the human dose based on mg/m²) was administered orally to rats. Pregnancy Teratogenic Effects Cefpodoxime proxetil was neither teratogenic nor embryocidal when administered to rats during organogenesis at doses up to 100 mg/kg/day (2 times the human dose based on mg/m²) or to rabbits at doses up to 30 mg/kg/day (1-2 times the human dose based on mg/m²). There are, however, no adequate and well-controlled studies of cefpodoxime proxetil use in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed. Labor And Delivery Cefpodoxime proxetil has not been studied for use during labor and delivery. Treatment should only be given if clearly needed. Nursing Mothers Cefpodoxime is excreted in human milk. In a study of 3 lactating women, levels of cefpodoxime in human milk were 0%, 2% and 6% of concomitant serum levels at 4 hours following a 200 mg oral dose of cefpodoxime proxetil. At 6 hours post-dosing, levels were 0%, 9% and 16% of concomitant serum levels. Because of the potential for serious reactions in nursing infants, 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 Safety and efficacy in infants less than 2 months of age have not been established. Geriatric Use Of the 3338 patients in multiple-dose clinical studies of cefpodoxime proxetil film-coated tablets, 521 (16%) were 65 and over, while 214 (6%) were 75 and over. No overall differences in effectiveness or safety were observed between the elderly and younger patients. In healthy geriatric subjects with normal renal function, cefpodoxime half-life in plasma averaged 4.2 hours and urinary recovery averaged 21% after a 400 mg dose was given every 12 hours for 15 days. Other pharmacokinetic parameters were unchanged relative to those observed in healthy younger subjects. Dose adjustment in elderly patients with normal renal function is not necessary. Overdosage & Contraindications OVERDOSE In acute rodent toxicity studies, a single 5 g/kg oral dose produced no adverse effects. In the event of serious toxic reaction from overdosage, hemodialysis or peritoneal dialysis may aid in the removal of cefpodoxime from the body, particularly if renal function is compromised. The toxic symptoms following an overdose of beta-lactam antibiotics may include nausea, vomiting, epigastric distress, and diarrhea. CONTRAINDICATIONS Cefpodoxime proxetil is contraindicated in patients with a known allergy to cefpodoxime or to the cephalosporin group of antibiotics. Clinical Pharmacology CLINICAL PHARMACOLOGY Absorption And Excretion Cefpodoxime proxetil is a prodrug that is absorbed from the gastrointestinal tract and de-esterified to its active metabolite, cefpodoxime. Following oral administration of 100 mg of cefpodoxime proxetil to fasting subjects, approximately 50% of the administered cefpodoxime dose was absorbed systemically. Over the recommended dosing range (100 to 400 mg), approximately 29 to 33% of the administered cefpodoxime dose was excreted unchanged in the urine in 12 hours. There is minimal metabolism of cefpodoxime in vivo. Effects Of Food The extent of absorption (mean AUC) and the mean peak plasma concentration increased when film-coated tablets were administered with food. Following a 200 mg tablet dose taken with food, the AUC was 21 to 33% higher than under fasting conditions, and the peak plasma concentration averaged 3.1 mcg/mL in fed subjects versus 2.6 mcg/mL in fasted subjects. Time to peak concentration was not significantly different between fed and fasted subjects. When a 200 mg dose of the suspension was taken with food, the extent of absorption (mean AUC) and mean peak plasma concentration in fed subjects were not significantly different from fasted subjects, but the rate of absorption was slower with food (48% increase in Tmax). Pharmacokinetics Of Cefpodoxime Proxetil Film-coated Tablets Over the recommended dosing range (100 to 400 mg), the rate and extent of cefpodoxime absorption exhibited dose-dependency; dose-normalized Cmax and AUC decreased by up to 32% with increasing dose. Over the recommended dosing range, the Tmax was approximately 2 to 3 hours and the T½ ranged from 2.09 to 2.84 hours. Mean Cmax was 1.4 mcg/mL for the 100 mg dose, 2.3 mcg/mL for the 200 mg dose, and 3.9 mcg/mL for the 400 mg dose. In patients with normal renal function, neither accumulation nor significant changes in other pharmacokinetic parameters were noted following multiple oral doses of up to 400 mg Q 12 hours. CEFPODOXIME PLASMA LEVELS (mcg/mL) IN FASTED ADULTS AFTER FILM-COATED TABLET ADMINISTRATION (Single Dose) Dose (cefpodoxime equivalents) Time after oral ingestion 1hr 2hr 3hr 4hr 6hr 8hr 12hr 100mg 0.98 1.4 1.3 1.0 0.59 0.29 0.08 200 mg 1.5 2.2 2.2 1.8 1.2 0.62 0.18 400 mg 2.2 3.7 3.8 3.3 2.3 1.3 0.38 Pharmacokinetics Of Cefpodoxime Proxetil Suspension In adult subjects, a 100 mg dose of oral suspension produced an average peak cefpodoxime concentration of approximately 1.5 mcg/mL (range: 1.1 to 2.1 mcg/mL), which is equivalent to that reported following administration of the 100 mg tablet. Time to peak plasma concentration and area under the plasma concentration-time curve (AUC) for the oral suspension were also equivalent to those produced with film-coated tablets in adults following a 100 mg oral dose. The pharmacokinetics of cefpodoxime were investigated in 29 patients aged 1 to 17 years. Each patient received a single, oral, 5 mg/kg dose of cefpodoxime oral suspension. Plasma and urine samples were collected for 12 hours after dosing. The plasma levels reported from this study are as follows: CEFPODOXIME PLASMA LEVELS (mcg/mL) IN FASTED PATIENTS (1 to 17 YEARS OF AGE) AFTER SUSPENSION ADMINISTRATION Dose Time (cefpodoxime equivalents) Time after oral ingestion 1hr 2hr 3hr 4hr 6hr 8hr 12hr 5 mg/kg* 1.4 2.1 2.1 1.7 0.90 0.40 0.090 *Dose did not exceed 200 mg. Distribution Protein binding of cefpodoxime ranges from 22 to 33% in serum and from 21 to 29% in plasma. Skin Blister Following multiple-dose administration every 12 hours for 5 days of 200 mg or 400 mg cefpodoxime proxetil, the mean maximum cefpodoxime concentration in skin blister fluid averaged 1.6 and 2.8 mcg/mL, respectively. Skin blister fluid cefpodoxime levels at 12 hours after dosing averaged 0.2 and 0.4 mcg/mL for the 200 mg and 400 mg multiple-dose regimens, respectively. Tonsil Tissue Following a single, oral 100 mg cefpodoxime proxetil film-coated tablet, the mean maximum cefpodoxime concentration in tonsil tissue averaged 0.24 mcg/g at 4 hours post-dosing and 0.09 mcg/g at 7 hours postdosing. Equilibrium was achieved between plasma and tonsil tissue within 4 hours of dosing. No detection of cefpodoxime in tonsillar tissue was reported 12 hours after dosing. These results demonstrated that concentrations of cefpodoxime exceeded the MIC90 of S. pyogenes for at least 7 hours after dosing of 100 mg of cefpodoxime proxetil. Lung Tissue Following a single, oral 200 mg cefpodoxime proxetil film-coated tablet, the mean maximum cefpodoxime concentration in lung tissue averaged 0.63 mcg/g at 3 hours post-dosing, 0.52 mcg/g at 6 hours post-dosing, and 0.19 mcg/g at 12 hours post-dosing. The results of this study indicated that cefpodoxime penetrated into lung tissue and produced sustained drug concentrations for at least 12 hours after dosing at levels that exceeded the MIC90 for S. pneumoniae and H. influenzae. CSF Adequate data on CSF levels of cefpodoxime are not available. Effects Of Decreased Renal Function Elimination of cefpodoxime is reduced in patients with moderate to severe renal impairment ( < 50 mL/min creatinine clearance). (See PRECAUTIONS and DOSAGE AND ADMINISTRATION.) In subjects with mild impairment of renal function (50 to 80 mL/min creatinine clearance), the average plasma half-life of cefpodoxime was 3.5 hours. In subjects with moderate (30 to 49 mL/min creatinine clearance) or severe renal impairment (5 to 29 mL/min creatinine clearance), the half-life increased to 5.9 and 9.8 hours, respectively. Approximately 23% of the administered dose was cleared from the body during a standard 3-hour hemodialysis procedure. Effect Of Hepatic Impairment (cirrhosis) Absorption was somewhat diminished and elimination unchanged in patients with cirrhosis. The mean cefpodoxime T½ and renal clearance in cirrhotic patients were similar to those derived in studies of healthy subjects. Ascites did not appear to affect values in cirrhotic subjects. No dosage adjustment is recommended in this patient population. Pharmacokinetics In Elderly Subjects Elderly subjects do not require dosage adjustments unless they have diminished renal function. (See PRECAUTIONS.) In healthy geriatric subjects, cefpodoxime half-life in plasma averaged 4.2 hours (vs 3.3 in younger subjects) and urinary recovery averaged 21% after a 400 mg dose was administered every 12 hours. Other pharmacokinetic parameters (Cmax, AUC, and Tmax) were unchanged relative to those observed in healthy young subjects. Microbiology Mechanism Of Action Cefpodoxime is a bactericidal agent that acts by inhibition of bacterial cell wall synthesis. Cefpodoxime has activity in the presence of some beta-lactamases, both penicillinases and cephalosporinases, of Gram-negative and Gram-positive bacteria. Mechanism Of Resistance Resistance to Cefpodoxime is primarily through hydrolysis by beta-lactamase, alteration of penicillin-binding proteins (PBPs), and decreased permeability. Cefpodoxime has been shown to be active against most isolates of the following bacteria, both in vitro and in clinical infections as described in the Indications and Usage (1) section: Gram-positive Bacteria Staphylococcus aureus (methicillin-Susceptible strains, including those producing penicillinases) Staphylococcus saprophyticus Streptococcus pneumoniae (excluding penicillin-resistant isolates) Streptococcus pyogenes Gram-negative Bacteria Escherichia coli Klebsiella pneumoniae Proteus mirabilis Haemophilus influenzae (including beta-lactamase producing isolates) Moraxella catarrhalis Neisseria gonorrhoeae (including penicillinase-producing isolates) The following in vitro data are available, but their clinical significance is unknown. At least 90 percent of the following microorganisms exhibit an in vitro minimum inhibitory concentration (MIC) less than or equal to the Susceptible breakpoint for Cefpodoxime. However, the efficacy of Cefpodoxime in treating clinical infections due to these microorganisms has not been established in adequate and well-controlled clinical trials. Gram-positive Bacteria Streptococcus agalactiae Streptococcus spp. (Groups C, F, G) Gram-negative Bacteria Citrobacter diversus Klebsiella oxytoca Proteus vulgaris Providencia rettgeri Haemophilus parainfluenzae Anaerobic Gram-positive Bacteria Peptostreptococcus magnus Susceptibility Test Methods When available, the clinical microbiology laboratory should provide the results of in vitro susceptibility test results for antimicrobial drug products used in resident hospitals to the physician as periodic reports that describe the susceptibility profile of nosocomial and community-acquired pathogens. These reports should aid the physician in selecting an antibacterial drug product for treatment. Dilution Techniques Quantitative methods are used to determine antimicrobial minimal inhibitory concentrations (MICs). These MICs provide estimates of the susceptibility of bacteria to antimicrobial compounds. The MICs should be determined using a standardized test method . The MIC values should be interpreted according to criteria provided 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. The zone size provides an estimate of the susceptibility of bacteria to antimicrobial compounds. The zone size should be determined using a standardized test method . This procedure uses paper disks impregnated with 10 mcg Cefpodoxime to test the susceptibility of microorganisms to Cefpodoxime. The disk diffusion interpretive criteria are provided in Table 1. Table 1: Susceptibility Test Interpretive Criteria for Cefpodoxime2 Pathogen Minimum Inhibitory Concentrations (mcg/ml) Disk Diffusion Diameters (mm) S I R S I R Enterobacteriaceae ≤ 2 4 ≥ 8 ≥ 21 18-20 ≤ 17 Haemophilus influenzae* ≤ 2 - - ≥ 21 - - Streptococcus pneumoniae ≤ 0.5 1 ≥ 2 - - - Neisseria gonorrhoeae* ≤ 0.5 - - ≥ 29 - - Susceptibility of staphylococci to Cefpodoxime may be deduced from testing only penicillin and either cefoxitin or oxacillin. *= The current absence of resistant isolates precludes defining any results other than “Susceptible.” Isolates yielding MIC results other than “Susceptible” should be submitted to a reference laboratory for further testing. A report of Susceptible indicates that the antimicrobial is likely to inhibit growth of the pathogen if the antimicrobial compound reaches the concentration at the infection site necessary to inhibit growth of the pathogen. 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 a high dosage of drug can be used. This category also provides a buffer zone that prevents small uncontrolled technical factors from causing major discrepancies in interpretation. A report of Resistant indicates that the antimicrobial is not likely to inhibit growth of the pathogen if the antimicrobial compound reaches the concentrations usually achievable at the infection site; other therapy should be selected. Quality Control Standardized susceptibility test procedures require the use of laboratory controls to monitor and ensure the accuracy and precision of supplies and reagents used in the assay, and the techniques of the individual performing the test1,2,3. Standard Cefpodoxime powder should provide the following range of MIC values noted in Table 2. For the diffusion technique using the 10 mcg disk, the criteria in Table 2 should be achieved. Table 2: Acceptable Quality Control Ranges for Cefpodoxime QC Strains Minimum Inhibitory Concentrations (mcg/mL) Disk Diffusion Zone diameters (mm) Escherichia coli ATCC 25922 0.25 - 1 23 – 28 Haemophilus influenzae ATCC 49247 0.25-1 25 - 31 Streptococcus pneumoniae ATCC 49619 0.03-0.12 28 - 34 Neisseria gonorrhoeae ATCC 49226 0.03 -0.12 35 - 43 Staphylococcus aureus ATCC 25923 -- 19 - 25 Staphylococcus aureus ATCC 29213 1 - 8 -- Clinical Trials Cystitis In two double-blind, 2:1 randomized, comparative trials performed in adults in the United States, cefpodoxime proxetil was compared to other beta-lactam antibiotics. In these studies, the following bacterial eradication rates were obtained at 5 to 9 days after therapy: Pathogen Cefpodoxime Comparator E. coli 200/243 (82%) 99/123 (80%) Other pathogens 34/42 (81%) 23/28 (82%) K. pneumoniae P. mirabilis S. saprophyticus TOTAL 234/285 (82%) 122/151 (81%) In these studies, clinical cure rates and bacterial eradication rates for cefpodoxime proxetil were comparable to the comparator agents; however, the clinical cure rates and bacteriologic eradication rates were lower than those observed with some other classes of approved agents for cystitis. Acute Otitis Media Studies In controlled studies of acute otitis media performed in the United States, where significant rates of betalactamase- producing organisms were found, cefpodoxime proxetil was compared to cefixime. In these studies, using very strict evaluability criteria and microbiologic and clinical response criteria at the 4 to 21 day posttherapy follow-up, the following presumptive bacterial eradication/clinical success outcomes (cured and improved) were obtained. Pathogen Cefpodoxime Proxetil 5 MG/KG Q 12 H X 5 D Cefixime S. pneumoniae 88/122 (72%) 72/124 (58%) H. influenzae 50/76 (66%) 61/81 (75%) M. catarrhalis 22/39 (56%) 23/41 (56%) S. pyogenes 20/25 (80%) 13/23 (57%) Clinical succes rate 171/254 (67%) 165/258 (64%) REFERENCES 1. Clinical and Laboratory Standards Institute (CLSI). Methods for Dilution Antimicrobial Susceptibility Tests for Bacteria that Grow Aerobically; Approved Standard - Ninth Edition. CLSI document M07-A9, Clinical and Laboratory Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087, USA, 2012. 2. Clinical and Laboratory Standards Institute (CLSI). Performance Standards for Antimicrobial Susceptibility Testing; Twenty-third Informational Supplement, CLSI document M100-S23. CLSI document M100-S23, Clinical and Laboratory Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087, USA, 2013. 3. Clinical and Laboratory Standards Institute (CLSI). Performance Standards for Antimicrobial Disk Diffusion Susceptibility Tests; Approved Standard - Eleventh Edition CLSI document M02-A11, Clinical and Laboratory Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087, USA, 2012. Medication Guide PATIENT INFORMATION Patients should be counseled that antibacterial drugs including VANTIN should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When VANTIN 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 VANTIN 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.
