Cephalexin is a broad-spectrum antibiotic available as capsules or suspension used to treat bacterial infections. Cephalexin is an antibiotic belonging to a class of drugs called cephalosporins that fight bacteria in the body. It can be used to treat infections such as bronchitis, as well as ear, skin, and urinary tract infections. Cephalexin may also be used for purposes other than those listed. Cephalexin requires a prescription from your veterinarian.