Research Area: Infection Biological Activity: Cefalexin or cephalexin is a first-generation cephalosporin antibiotic. It is an orally administered agent with a similar antimicrobial spectrum to the intravenous agents cefalotin and cefazolin. Cefalexin is used to treat urinary tract infections, respiratory tract infections, and skin and soft tissue infections. It is also sometimes used to treat acne. [1]