Cephalexin is one of a group of Cephalosporins are used in the treatment of infections caused by bacteria. They work by killing bacteria or by preventing their growth.
Be sure to tell your doctor of any allergies you have whether it is to medication or food, preservatives, or dyes. Also, tell your doctor of any other medications you are taking, including vitamins and supplements, and any medical conditions you may have.
It is very important that you take this medicine exactly as your doctor tells you to. Do not take more or less medicine than directed, and don’t stop taking Cefzil without discussing it with your doctor first.
If you miss a dose of this medicine, take it as soon as you remember, unless it is almost time for your next dose. Do NOT double doses.
Tell your doctor immediately if any of the following side effects occur: black, tarry stools; chest pain; chills; cough; fever; painful or difficult urination; shortness of breath; sore throat; sores, ulcers, or white spots on lips or in mouth; swollen glands; unusual bleeding or bruising; unusual tiredness or weakness; abdominal or stomach cramps and pain; abdominal tenderness; diarrhea (watery and severe, which may also be bloody); hives or welts, itching redness of skin, or skin rash; pain, redness and swelling at site of injection; peeling of skin; or seizures.
Keflex (Cephalexin Capsules, USP) is a semisynthetic cephalosporin antibiotic intended for oral administration. It is 7-(D-a-Amino-a-phenylacetamido)-3-methyl-3-cephem-4-carboxylic acid monohydrate. Cephalexin has the molecular formula C16H17N3O4S•H2O and the molecular weight is 365.41. Each pulvule contains cephalexin monohydrate equivalent to 250 mg (720 µmol) or 500 mg (1439 µmol) of cephalexin. The Pulvules also contain cellulose, D & C Yellow No. 10, F D & C Blue No. 1, F D & C Yellow No. 6, gelatin, magnesium stearate, silicone, titanium dioxide, and other inactive ingredients.
Cephalexin has the following structural formula:
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