The role of vancomycin and metronidazole for the treatment of Clostridium difficile-associated diarrhea.

For the treatment of Clostridium difficile-associated diarrhea (CDAD), metronidazole and vancomycin remain the most commonly used agents. The major advantage of metronidazole is its low cost, while the advantage of oral vancomycin is a more favorable pharmacokinetic profile. The epidemiology and clinical severity of CDAD have changed due to the emergence of a hypervirulent strain (BI/NAP1/027). In 2010, the Infectious Diseases Society of America/Society for Health Care Epidemiology of America expert panel defined severe CDAD and recommended oral vancomycin to treat these patients. Metronidazole remains the preferred agent for treatment of mild to moderate CDAD.