This document provides information on Cleocin HCl (clindamycin hydrochloride) capsules. It includes warnings about the risk of Clostridium difficile associated diarrhea with antibiotic use. It describes the pharmacokinetics of clindamycin, its antimicrobial activity against various bacteria, and guidelines for susceptibility testing. It indicates clindamycin is used to treat serious infections caused by susceptible anaerobic bacteria and certain streptococci, pneumococci, and staphylococci. Culture and susceptibility testing is recommended to determine the appropriate use of clindamycin.