Nystatin is an antifungal medication primarily used to treat fungal infections caused by Candida species. Its uses include:

• Treating fungal or yeast infections of the skin, such as diaper rash and other cutaneous candidiasis

• Treating oral thrush (fungal infection inside the mouth)

• Treating fungal infections of the lining of the stomach and intestines

• Treating vaginal yeast infections and esophageal candidiasis

• Preventing fungal infections in people at high risk, such as immunocompromised patients or very low birth-weight infants

• It can be applied topically as creams or ointments, used as oral tablets or suspension, or applied vaginally depending on the infection site

Nystatin works by stopping the growth of fungi and is effective mainly against Candida infections. It is not effective against bacterial or viral infections

. Common forms include oral suspension for mouth infections, topical creams for skin infections, and vaginal formulations for yeast infections

. It is generally well tolerated, with possible side effects including skin irritation, nausea, vomiting, and diarrhea

. In summary, nystatin is used to treat and prevent fungal infections caused by Candida on the skin, in the mouth, gastrointestinal tract, and vagina.