Consider diagnosis of pseudomembranous colitis in patients w/ diarrhea.
Clostridium difficile-associated diarrhea. Patients w/ congenital or documented QT prolongation, those currently receiving treatment w/ other drugs known to prolong QT interval eg, class IA & III antiarrhythmics, antipsychotics, antidepressants & fluoroquinolones; electrolyte disturbances, bradycardia, cardiac arrhythmia or cardiac insufficiency. Do not use during pregnancy. Lactation. Elderly.