NAPLEX Practice Exam 2026 – Comprehensive Test Preparation

Fidaxomicin is specifically used to treat bacterial infections caused by strains of the bacterium Clostridium difficile (C. diff). This medication works by inhibiting the growth and reproduction of the bacteria, making it an effective treatment for C. diff infections. Option A, B, and D are incorrect because they do not address the primary function of fidaxomicin, which is to treat C. diff infections. Hepatitis B and HIV are viral infections, not bacterial infections, and acne is a skin condition, not a bacterial infection. Therefore, these options would not be treated with fidaxomicin.