Nystan, commonly known by its generic name Nystatin, is an antifungal medication widely used to treat fungal infections, particularly those caused by Candida species such as thrush. It is effective in treating infections in various parts of the body, including the mouth, throat, and digestive tract, as well as skin and vaginal yeast infections. Nystatin works by binding to sterols in the fungal cell membrane, thereby altering the membrane's permeability and leading to the leakage of essential cellular components, which ultimately results in the death of the fungus. Available in several forms, including tablets, creams, ointments, and oral suspensions, Nystan is specifically designed for topical or oral use, depending on the location of the infection. It is important to note that Nystan is not absorbed into the bloodstream from the skin or mucous membranes, making it a safe option for treating localized infections without systemic effects.