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The use of vancomycin, 125 mg four times daily for 10 days, is preferred for any recurrence if it is severe, even if the initial episode had been treated with metronidazole. If the initial episode was treated with vancomycin, a tapered and pulsed regimen or just a pulsed regimen of vancomycin may be considered; none of these recommendations for extended vancomycin regimens have been studied in RCTs.
Evidence that longer, tapered, pulsed-dosing is more effective than conventional regimens comes from evaluation of placebo-treated patients in a trial of a probiotic adjunct to antibiotic therapy in patients who already had one or more recurrences. There are no controlled data to support specific tapering or pulse regimens (86). We here propose a simple cost-effective regimen: a standard 10-day course of vancomycin at a dose of 125 mg given four times daily, followed by 125 mg daily pulsed every 3 days for ten doses (Scott Curry, personal communication).