Keflex is a brand name of the antibiotic drug cephalexin, which belongs to the cephalosporin family. Synonyms for Keflex include cephalexin monohydrate, cefalin, cepalaxin, sporidex, keftab, and kefzol. These drugs contain the same active ingredient as Keflex and are used for the same purpose, i.e., to treat bacterial infections of the skin, respiratory tract, urinary tract, and other infections. The selection of a specific drug depends on the severity and type of infection, age, and medical history of the patient. As with any antibiotics, it is important to follow the doctor's instructions properly to ensure treatment efficacy and minimize any side effects.