Nystatin is an antifungal medication primarily used to treat infections caused by fungi, particularly those in the Candida family. It works by binding to the fungal cell membrane, causing it to leak and ultimately leading to the death of the fungus. Nystatin is commonly prescribed for oral thrush, a fungal infection in the mouth, and for skin infections. This medication is available in various forms, including oral suspensions, tablets, and topical creams. It is generally well-tolerated, with few side effects, making it a popular choice for treating localized fungal infections without significant systemic effects.