Gris-Peg is an antifungal drug that is used in treating fungal infections. Gris-peg is a drug that is used in the treatment of fungal infections of the skin, hair and nails that do not respond to creams or lotions. In addition, Gris-peg is used to get rid of symptoms such as discolored nails, scaly or peeling skin and itching. Gris-Peg works by preventing fungi from growing and multiplying. The active ingredients in this drug are Griseofulvin and Ultramicrosize.