cefadroxil
Dosage Form: powder, for suspension
To reduce the development of drug-resistant bacteria and maintain the effectiveness of Duricef® and other antibacterial drugs, Duricef should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria.
Duricef Description
Duricef is a semisynthetic cephalosporin antibiotic intended for oral administration. It is a white to yellowish-white crystalline powder. It is soluble in water and it is acid-stable. It is chemically designated as 5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 7-[[amino(4-hydroxyphenyl)acetyl]amino]-3-methyl-8-oxo-, monohydrate[6R-[6α,7β(R*)]]-. It has the formula C16H17N3O5S • H2O and the molecular weight of 381.40. It has the following structural formula:
Duricef film-coated tablets, 1 g, contain the following inactive ingredients: microcrystalline cellulose, hydroxypropyl methylcellulose, magnesium stearate, polyethylene glycol, polysorbate 80, simethicone emulsion, and titanium dioxide.
Duricef for Oral Suspension contains the following inactive ingredients: FD&C Yellow No. 6, flavors (natural and artificial), polysorbate 80, sodium benzoate, sucrose, and xanthan gum.
Duricef capsules contain the following inactive ingredients: D&C Red No. 28, FD&C Blue No. 1, FD&C Red No. 40, gelatin, magnesium stearate, and titanium dioxide.
Duricef - Clinical Pharmacology
Duricef is rapidly absorbed after oral administration. Following single doses of 500 mg and 1000 mg, average peak serum concentrations were approximately 16 and 28 μg/mL, respectively. Measurable levels were present 12 hours after administration. Over 90% of the drug is excreted unchanged in the urine within 24 hours. Peak urine concentrations are approximately 1800 μg/mL during the period following a single 500 mg oral dose. Increases in dosage generally produce a proportionate increase in Duricef (cefadroxil monohydrate, USP) urinary concentration. The urine antibiotic concentration, following a 1 g dose, was maintained well above the MIC of susceptible urinary pathogens for 20 to 22 hours.
Microbiology
In vitro tests demonstrate that the cephalosporins are bactericidal because of their inhibition of cell-wall synthesis. Cefadroxil has been shown to be active against the following organisms both in vitro and in clinical infections (see INDICATIONS AND USAGE):
Beta-hemolytic streptococci
Staphylococci, including penicillinase-producing strains
Streptococcus (Diplococcus) pneumoniae
Escherichia coli
Proteus mirabilis
Klebsiella species
Moraxella (Branhamella) catarrhalis
Note: Most strains of Enterococcus faecalis (formerly Streptococcus faecalis) and Enterococcus faecium (formerly Streptococcus faecium) are resistant to Duricef. It is not active against most strains of Enterobacter species, Morganella morganii (formerly Proteus morganii), and P. vulgaris. It has no activity against Pseudomonas species and Acinetobacter calcoaceticus (formerly Mima and Herellea species).
Susceptibility tests: Diffusion techniques
The use of antibiotic disk susceptibility test methods which measure zone diameter give an accurate estimation of antibiotic susceptibility. One such standard procedure1 which has been recommended for use with disks to test susceptibility of organisms to cefadroxil uses the cephalosporin class (cephalothin) disk. Interpretation involves the correlation of the diameters obtained in the disk test with the minimum inhibitory concentration (MIC) for cefadroxil.
Reports from the laboratory giving results of the standard single-disk susceptibility test with a 30 μg cephalothin disk should be interpreted according to the following criteria:
| Zone diameter (mm) | Interpretation |
| ≥ 18 | (S) Susceptible |
| 15–17 | (I) Intermediate |
| ≤ 14 | (R) Resistant |
A report of “Susceptible” indicates that the pathogen is likely to be inhibited by generally achievable blood levels. A report of “intermediate susceptibility” suggests that the organism would be susceptible if high dosage is used or if the infection is confined to tissue and fluids (e.g., urine) in which high antibiotic levels are attained. A report of “Resistant’’ indicates that achievable concentrations of the antibiotic are unlikely to be inhibitory and other therapy should be selected.
Standardized procedures require the use of laboratory control organisms. The 30 μg cephalothin disk should give the following zone diameters:
| Organism | Zone Diameter (mm) |
| Staphylococcus aureus ATCC 25923 | 29–37 |
| Escherichia coli ATCC 25922 | 17–22 |
Dilution Techniques
When using the NCCLS agar dilution or broth dilution (including microdilution) method2 or equivalent, a bacterial isolate may be considered susceptible if the MIC (minimum inhibitory concentration) value for cephalothin is 8 μg/mL or less. Organisms are considered resistant if the MIC is 32 μg/mL or greater. Organisms with an MIC value of less than 32 μg/mL but greater than 8 μg/mL are intermediate.
As with standard diffusion methods, dilution procedures require the use of laboratory control organisms. Standard cephalothin powder should give MIC values in the range of 0.12 μg/mL and 0.5 μg/mL for Staphylococcus aureus ATCC 29213. For Escherichia coli ATCC 25922, the MIC range should be between 4.0 μg/mL and 16.0 μg/mL. For Streptococcus faecalis ATCC 29212, the MIC range should be between 8.0 and 32.0 μg/mL.
Indications and Usage for Duricef
Duricef is indicated for the treatment of patients with infection caused by susceptible strains of the designated organisms in the following diseases:
Urinary tract infections caused by E. coli, P. mirabilis, and Klebsiella species.
Skin and skin structure infections caused by staphylococci and/or streptococci.
Pharyngitis and/or tonsillitis caused by Streptococcus pyogenes (Group A beta-hemolytic streptococci).
Note: Only penicillin by the intramuscular route of administration has been shown to be effective in the prophylaxis of rheumatic fever. Duricef is generally effective in the eradication of streptococci from the oropharynx. However, data establishing the efficacy of Duricef for the prophylaxis of subsequent rheumatic fever are not available.
Note: Culture and susceptibility tests should be initiated prior to and during therapy. Renal function studies should be performed when indicated.
To reduce the development of drug-resistant bacteria and maintain the effectiveness of Duricef and other antibacterial drugs, Duricef 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.
Contraindications
Duricef is contraindicated in patients with known allergy to the cephalosporin group of antibiotics.
Warnings
BEFORE THERAPY WITH Duricef IS INSTITUTED, CAREFUL INQUIRY SHOULD BE MADE TO DETERMINE WHETHER THE PATIENT HAS HAD PREVIOUS HYPERSENSITIVITY REACTIONS TO CEFADROXIL, CEPHALOSPORINS, PENICILLINS, OR OTHER DRUGS. IF THIS PRODUCT IS TO BE GIVEN TO PENICILLIN-SENSITIVE PATIENTS, CAUTION SHOULD BE EXERCISED BECAUSE CROSS-SENSITIVITY 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 Duricef OCCURS, DISCONTINUE THE DRUG. SERIOUS ACUTE HYPERSENSITIVITY REACTIONS MAY REQUIRE TREATMENT WITH EPINEPHRINE AND OTHER EMERGENCY MEASURES, INCLUDING OXYGEN, INTRAVENOUS FLUIDS, INTRAVENOUS ANTIHISTAMINES, CORTICOSTEROIDS, PRESSOR AMINES, AND AIRWAY MANAGEMENT, AS CLINICALLY INDICATED.
Clostridium difficile associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including Duricef, 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.
Precautions
General
Duricef should be used with caution in the presence of markedly impaired renal function (creatinine clearance rate of less than 50 mL/min/1.73 M2). (See DOSAGE AND ADMINISTRATION.) In patients with known or suspected renal impairment, careful clinical observation and appropriate laboratory studies should be made prior to and during therapy.
Prescribing Duricef 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.
Prolonged use of Duricef may result in the overgrowth of nonsusceptible organisms. Careful observation of the patient is essential. If superinfection occurs during therapy, appropriate measures should be taken.
Duricef should be prescribed with caution in individuals with history of gastrointestinal disease particularly colitis.
Information for Patients
Patients should be counseled that antibacterial drugs including Duricef should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When Duricef 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 Duricef 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.
Drug/Laboratory Test Interactions
Positive direct Coombs’ tests have been reported during treatment with the cephalosporin antibiotics. In hematologic studies or in transfusion cross-matching procedures when antiglobulin tests are performed on the minor side or in Coombs’ testing of newborns whose mothers have received cephalosporin antibiotics before parturition, it should be recognized that a positive Coombs’ test may be due to the drug.
Carcinogenesis, Mutagenesis and Impairment of Fertility
No long-term studies have been performed to determine carcinogenic potential. No genetic toxicity tests have been performed.
Pregnancy: Pregnancy Category B
Reproduction studies have been performed in mice and rats at doses up to 11 times the human dose and have revealed no evidence of impaired fertility or harm to the fetus due to cefadroxil monohydrate. There are, however, no adequate and well controlled studies 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
Duricef has not been studied for use during labor and delivery. Treatment should only be given if clearly needed.
Nursing Mothers
Caution should be exercised when cefadroxil monohydrate is administered to a nursing mother.
Pediatric Use
(See DOSAGE AND ADMINISTRATION.)
Geriatric Use
Of approximately 650 patients who received cefadroxil for the treatment of urinary tract infections in three clinical trials, 28% were 60 years and older, while 16% were 70 years and older. Of approximately 1000 patients who received cefadroxil for the treatment of skin and skin structure infection in 14 clinical trials, 12% were 60 years and older while 4% were 70 years and over. No overall differences in safety were observed between the elderly patients in these studies and younger patients. Clinical studies of cefadroxil for the treatment of pharyngitis or tonsillitis did not include sufficient numbers of patients 65 years and older to determine whether they respond differently from younger patients. Other reported clinical experience with cefadroxil has not identified differences in responses between elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.
Cefadroxil is substantially excreted by the kidney, and dosage adjustment is indicated for patients with renal impairment (see DOSAGE AND ADMINISTRATION: Renal Impairment). Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function.
Adverse Reactions
Gastrointestinal
Onset of pseudomembranous colitis symptoms may occur during or after antibiotic treatment (see WARNINGS). Dyspepsia, nausea and vomiting have been reported rarely. Diarrhea has also occurred.
Hypersensitivity
Allergies (in the form of rash, urticaria, angioedema, and pruritus) have been observed. These reactions usually subsided upon discontinuation of the drug. Anaphylaxis has also been reported.
Other
Other reactions have included hepatic dysfunction including cholestasis and elevations in serum transaminase, genital pruritus, genital moniliasis, vaginitis, moderate transient neutropenia, fever. Agranulocytosis, thrombocytopenia, idiosyncratic hepatic failure, erythema multiforme, Stevens-Johnson syndrome, serum sickness, and arthralgia have been rarely reported.
In addition to the adverse reactions listed above which have been observed in patients treated with cefadroxil, the following adverse reactions and altered laboratory tests have been reported for cephalosporin-class antibiotics:
Toxic epidermal necrolysis, abdominal pain, superinfection, renal dysfunction, toxic nephropathy, aplastic anemia, hemolytic anemia, hemorrhage, prolonged prothrombin time, positive Coombs’ test, increased BUN, increased creatinine, elevated alkaline phosphatase, elevated aspartate aminotransferase (AST), elevated alanine aminotransferase (ALT), elevated bilirubin, elevated LDH, eosinophilia, pancytopenia, neutropenia.
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.
Overdosage
A study of children under six years of age suggested that ingestion of less than 250 mg/kg of cephalosporins is not associated with significant outcomes. No action is required other than general support and observation. For amounts greater than 250 mg/kg, induce gastric emptying.
In five anuric patients, it was demonstrated that an average of 63% of a 1 g oral dose is extracted from the body during a 6–8 hour hemodialysis session.
Duricef Dosage and Administration
Duricef is acid-stable and may be administered orally without regard to meals. Administration with food may be helpful in diminishing potential gastrointestinal complaints occasionally associated with oral cephalosporin therapy.
Adults
Urinary Tract Infections: For uncomplicated lower urinary tract infections (i.e., cystitis) the usual dosage is 1 or 2 g per day in a single (q.d.) or divided doses (b.i.d.).
For all other urinary tract infections the usual dosage is 2 g per day in divided doses (b.i.d.).
Skin and Skin Structure Infections: For skin and skin structure infections the usual dosage is 1 g per day in single (q.d.) or divided doses (b.i.d.).
Pharyngitis and Tonsillitis: Treatment of group A beta-hemolytic streptococcal pharyngitis and tonsillitis—1 g per day in single (q.d.) or divided doses (b.i.d.) for 10 days.
Children
For urinary tract infections, the recommended daily dosage for children is 30 mg/kg/day in divided doses every 12 hours. For pharyngitis, tonsillitis, and impetigo, the recommended daily dosage for children is 30 mg/kg/day in a single dose or in equally divided doses every 12 hours. For other skin and skin structure infections, the recommended daily dosage is 30 mg/kg/day in equally divided doses every 12 hours. In the treatment of beta-hemolytic streptococcal infections, a therapeutic dosage of Duricef should be administered for at least 10 days.
See chart for total daily dosage for children.
| CHILD'S WEIGHT | |||
| lbs kg | 260 mg/5 mL | 500 mg/5 mL | |
| 10 | 4.5 | ½ tsp | |
| 20 | 9.1 | 1 tsp | |
| 30 | 13.6 | 1½ tsp | |
| 40 | 18.2 | 2 tsp | 1 tsp |
| 50 | 22.7 | 2½ tsp | 1¼ tsp |
| 60 | 27.3 | 3 tsp | 1½ tsp |
70 & above | 31.8+ | — | 2 tsp |
Renal Impairment
In patients with renal impairment, the dosage of cefadroxil monohydrate should be adjusted according to creatinine clearance rates to prevent drug accumulation. The following schedule is suggested. In adults, the initial dose is 1000 mg of Duricef and the maintenance dose (based on the creatinine clearance rate [mL/min/1.73 M2]) is 500 mg at the time intervals listed below.
| Creatinine Clearances | Dosage Interval |
| 010 mL/min | 36 hours |
| 1025 mL/min | 24 hours |
| 2550 mL/min | 12 hours |
Patients with creatinine clearance rates over 50 mL/min may be treated as if they were patients having normal renal function.
| Bottle Size | Reconstitution Directions |
| 100 mL | Suspend in a total of 67 mL water. Method: Tap bottle lightly to loosen powder. Add 67 mL of water in two portions. Shake well after each addition. |
| 75 mL | Suspend in a total of 51 mL water. Method: Tap bottle lightly to loosen powder. Add 51 mL of water in two portions. Shake well after each addition. |
| 50 mL | Suspend in a total of 34 mL water. Method: Tap bottle lightly to loosen powder. Add 34 mL of water in two portions. Shake well after each addition. |
After reconstitution, store in refrigerator. Shake well before using. Keep container tightly closed. Discard unused portion after 14 days. | |
How is Duricef Supplied
Duricef® (cefadroxil monohydrate, USP) 500 mg Capsules: opaque, maroon and white hard gelatin capsules, imprinted with “PPP’’ and “784’’ on one end and with “Duricef’’ and “500 mg’’ on the other end.
Capsules are supplied as follows:
N 0430-0780-19 Bottle of 50
Store at controlled room temperature 15°–30° C (59°–86° F).
Duricef® 1 gram Tablets: white to off white, top bisected, oval shaped, imprinted with “PPP’’ on one side of the bisect and “785’’ on the other side of the bisect. Tablets are supplied as follows:
N 0430-0781-19 Bottle of 50
Store at controlled room temperature 15°–30° C (59°–86° F).
Duricef® for Oral Suspension is orange-pineapple flavored, and is supplied as follows:
250 mg/5 mL N 0430-2782-15 50 mL Bottle
N 0430-2782-17 100 mL Bottle
500 mg/5 mL N 0430-2783-16 75 mL Bottle
N 0430-2783-17 100 mL Bottle
Prior to reconstitution: Store at controlled room temperature 15°–30° C (59°–86° F).
REFERENCES
1. National Committee for Clinical Laboratory Standards, Approved Standard, Performance Standards for Antimicrobial Disk Susceptibility Test, 4th Edition, Vol. 10 (7): M2-A4, Villanova, PA, April, 1990.
2. National Committee for Clinical Laboratory Standards, Approved Standard: Methods for Dilution Antimicrobial Susceptibility Tests for Bacteria that Grow Aerobically, 2nd Edition, Vol. 10 (8): M7-A2, Villanova, PA, April, 1990.
Manufactured by Bristol-Myers Squibb Co.
Princeton, NJ 08543
For Warner Chilcott Company, Inc.
Fajardo, PR 00738
Marketed by Warner Chilcott, Inc.
Rockaway, NJ 07866
2782G073
Revised April 2007
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Revised: 05/2007Warner Chilcott, Inc.
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