Treatment of Clostridioides difficile Infection

Initial Episode

The Infectious Diseases Society of America (IDSA) and Society for Healthcare Epidemiology of America (SHEA) recommend vancomycin 125mg four times daily for 10 days for initial non-severe CDI 1
The IDSA and SHEA recommend vancomycin 125mg four times daily for 10 days for initial severe CDI 1
An alternative treatment for initial episode is fidaxomicin 200mg twice daily for 10 days 1

For first recurrence, if metronidazole was used initially, vancomycin 125mg four times daily for 10 days is recommended 1
For first recurrence, if standard vancomycin was used initially, a tapered and pulsed vancomycin regimen may be considered 1
For second or subsequent recurrence, vancomycin in a tapered and pulsed regimen is recommended 1
For second or subsequent recurrence, vancomycin 125mg four times daily for 10 days followed by rifaximin 400mg three times daily for 20 days may be considered 1
Fidaxomicin 200mg twice daily for 10 days is an alternative treatment for recurrence 1
Fecal microbiota transplantation may be considered after appropriate antibiotic treatments have failed for second or subsequent recurrence 1

Multiple randomized controlled trials have established the 10-day treatment duration as standard for vancomycin in CDI treatment, achieving high clinical cure rates (85-98%) 2
The IDSA and SHEA guidelines note that there is insufficient evidence to recommend extending treatment beyond 10 days for standard cases 1
Extending treatment duration to 14 days may be considered for patients with delayed response 1

For fulminant CDI, a higher dose of 500mg four times daily is recommended, along with intravenous metronidazole 1
The risk of CDI recurrence remains a concern even with appropriate treatment duration, with recurrence rates of 5-33% after standard vancomycin treatment 2