Cephalexin (Keflex) is an antibiotic in the Cephalosporin Family. Cephalexin is a very common antibiotic that is used to treat a variety of bacterial infections.

Cephalexin is occasionally used to treat acne. There is limited clinical research into the efficacy of Cephalexin as an acne treatment. However, come patients have reported that Cephalexin improved their acne symptoms. Antibiotic susceptibility testing indicates that the acne-causing P. acnes bacterium is generally sensitive to Cephalosporin fmaily antibiotics, including Cephalexin.