bacterial infection
"Like several others have said - this drug works great if you take it properly.  I was prescribed clindamycin for an infection in my gums, and after reading reviews I was nervous about taking it.  I spaced my doses 7 hours apart, made sure to drink plenty of water throughout the day, and took probiotics (Florastor and Culturelle) 2x per day, and I have had no issues.  My infection has greatly subsided, and I haven't had any side effects described in other reviews.."