Clindamycin isan antibiotic that fights bacteria in the body. Clindamycin isused to treat serious infections caused by bacteria. Clindamycin mayalso be used for purposes not listed in this medication guide. Importantinformation Clindamycin cancause diarrhea, which may be severe or lead to serious, life-threateningintestinal problems. If you have diarrhea that is watery or bloody, stopusing this medicine and call your doctor.