Which antibiotic is most closely associated with Clostridioides difficile infection?

• A. Clindamycin
• B. Amoxicillin
• C. Azithromycin
• D. Ciprofloxacin

Answer: (A)

The main idea is that antibiotic exposure can wipe out the normal gut bacteria, allowing Clostridioides difficile to flourish and produce toxins that inflame the colon. Clindamycin is especially linked to this problem because it causes a profound disruption of the gut microbiota, leading to a higher risk of C. difficile infection and pseudomembranous colitis. Other antibiotics like amoxicillin, azithromycin, or ciprofloxacin can also predispose to CDI, but their association is not as strong as that of clindamycin. Recognizing this helps explain why CDI is a common complication after clindamycin use and underscores the importance of choosing antibiotics with a narrower impact on gut flora when possible.