Common adverse drug reactions (ADRs) associated with clindamycin therapy — found in over 1% of patients — include: diarrhea, pseudomembranous colitis, nausea, vomiting, abdominal pain or cramps, rash, and/or itch. High doses (both intravenous and oral) may cause a metallic taste, and topical application may cause contact dermatitis.[30] Diarrhea, vomiting, and nausea are common if the individual lies down for an extended period of time within 30 minutes of taking clindamycin. In addition, severe heartburn can be expected for up to three days if the individual does not stay in an elevated position for at least 30 minutes.

Pseudomembranous colitis is a potentially lethal condition commonly associated with clindamycin, but which occurs with other antibiotics, as well. Overgrowth of Clostridium difficile, which is inherently resistant to clindamycin, results in the production of a toxin that causes a range of adverse effects, from diarrhea to colitis and toxic megacolon.

Rarely — in less than 0.1% of patients — clindamycin therapy has been associated with anaphylaxis, blood dyscrasias, polyarthritis, jaundice, raised liver enzyme levels, and/or hepatotoxicity.

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