(Keflex®, Keftab® and Biocef® are other names for this medication)

Use: Cephalexin is an antibiotic of the cephalosporin class given orally to treat infections.

Side Effects: Cephalosporin does not usually cause side effects; however some animals will experience stomach upset, vomiting and diarrhea. Giving cephalexin with food may help reduce this effect. Some dogs receiving cephalexin have experienced excessive salivation, panting and excitability. Cats have experienced vomiting and fever. Fever in a cat is a temperature of greater than 103 F. Cephalexin in very high doses can cause damage to the kidneys. Some animals will experience rashes from cephalexin.

Cephalexin may cause a false positive when used with some brands of dip sticks used to check for sugar in the urine of diabetic animals.

Precautions: Animals that are allergic to penicillin or penicillin-like drugs should not take cephalexin. Cephalexin and other cephalosporins must be eliminated by the kidneys. Animals with kidney failure may receive a lower dose of the drug. Cephalexin and other cephalosporins can cause seizures in epileptic patients and should be used with caution in these animals.

Directions: Dogs and cats usually receive cephalexin orally as a capsule, tablet or liquid two to three times daily. A transdermal cream is also available for felines.

Remember: Cephalexin should be stored in a tight, light resistant, childproof container away from children and household pets. Oral liquids should be stored in the refrigerator and shaken well before use. Pet owners who are allergic to penicillin and penicillin-like drugs should avoid handling this medication. It is normal for cephalexin to have a strong sulfurous odor.

If you miss a dose of this medication you should give it as soon as you remember it, but if it is within a few hours of the regularly scheduled dose, wait and give it at the regular time. Do not double a dose as this can be toxic to your pet.