Contraindications

Cephalexin is contraindicated in patients with known allergy to the cephalosporin group of antibiotics.

DOSAGE & ADMINISTRATION

Cephalexin is administered orally.

Adults — The adult dosage ranges from 1 to 4 g daily in divided doses. The 333 mg and 750 mg strengths should be administered such that the daily dose is within 1 to 4 grams per day. The usual adult dose is 250 mg every 6 hours. For the following infections, a dosage of 500 mg may be administered every 12 hours: streptococcal pharyngitis, skin and skin structure infections, and uncomplicated cystitis in patients over 15 years of age. Cystitis therapy should be continued for 7 to 14 days. For more severe infections or those caused by less susceptible organisms, larger doses may be needed. If daily doses of Cephalexin greater than 4 g are required, parenteral cephalosporins, in appropriate doses, should be considered.

Pediatric Patients — The usual recommended daily dosage for pediatric patients is 25 to 50 mg/kg in divided doses. For streptococcal pharyngitis in patients over 1 year of age and for skin and skin structure infections, the total daily dose may be divided and administered every 12 hours.

In severe infections, the dosage may be doubled.

In the therapy of otitis media, clinical studies have shown that a dosage of 75 to 100 mg/kg/day in 4 divided doses is required.

In the treatment of β-hemolytic streptococcal infections, a therapeutic dosage of Cephalexin should be administered for at least 10 days.

Before taking this medicine

Do not use this medication if you are allergic to cephalexin, or to other cephalosporin antibiotics, such as:

• cefaclor (Ceclor);

• cefadroxil (Duricef);

• cefdinir (Omnicef);

• cefditoren (Spectracef);

• cefixime (Suprax);

• cefprozil (Cefzil);

• ceftazidime (Fortaz); or

• cefuroxime (Ceftin).

Before using cephalexin, tell your doctor if you are allergic to any drugs (especially penicillins), or if you have:

• kidney disease;

• liver disease;

• a stomach or intestinal disorder such as colitis;

• diabetes; or

• if you are malnourished.

If you have any of these conditions, you may need a dose adjustment or special tests to safely take cephalexin.

The oral suspension (liquid) form of cephalexin may contain sugar. This may affect you if you have diabetes.

FDA pregnancy category B. Cephalexin is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment. Cephalexin can pass into breast milk and may harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.