Nystan is a brand name for the drug nystatin, which is an antifungal medication used to treat various yeast and fungal infections. Synonyms for nystan include Azostatin, Fungicidin, Mycostatin, and Nadostine. These drugs contain nystatin as an active ingredient and work to eliminate the growth of fungi and yeast by disrupting cell wall synthesis. Nystatin is commonly used to treat thrush, vaginal yeast infections, and diaper rash. There are several generic versions of nystatin available, which can be prescribed by a healthcare provider. While nystan is a brand name for nystatin, it is important to use the drug under the supervision of a healthcare professional.