What is NOT used to treat bacterial infections?

Nystatin is an antifungal medication, primarily used to treat fungal infections caused by Candida species. It works by binding to sterols in the fungal cell membrane, leading to cell death. In contrast, the other options listed—Amoxicillin, Ciprofloxacin, and Gentamicin—are antibiotics specifically targeted at treating bacterial infections. Amoxicillin is a penicillin-type antibiotic effective against a variety of bacteria, while Ciprofloxacin and Gentamicin are antibiotics that target different types of bacteria and have various mechanisms of action. Therefore, the correct answer identifies a medication that does not address bacterial infections, highlighting the importance of using the appropriate class of medication for the specific type of infection.