A 55-year-old hospitalized patient develops a first episode of non-severe Clostridioides difficile infection. According to modern clinical guidelines, what is the preferred first-line oral therapy?

Answer and explanation

Correct answer: D. Oral vancomycin or fidaxomicin

  1. Step 1: Updated IDSA/SHEA guidelines no longer recommend oral metronidazole as first-line therapy for Clostridioides difficile infection due to higher treatment failure rates.
  2. Step 2: Preferred first-line therapy is oral vancomycin (125 mg four times daily) or oral fidaxomicin (200 mg twice daily) for 10 days, ensuring high intraluminal bactericidal concentrations.
Answer
Oral vancomycin or fidaxomicin.
Why not the others: Oral metronidazole is now reserved only as an alternative when oral vancomycin and fidaxomicin are unavailable. Intravenous vancomycin is not excreted into the colonic lumen in therapeutic concentrations and is ineffective for C. difficile colitis. Ciprofloxacin is a fluoroquinolone that promotes C. difficile overgrowth.

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