Ketoconazole is an antifungal medication that is used to treat certain infections caused by fungus. Ketoconazole belongs to the class of drugs called azole antifungals. It works by stopping the growth of the fungus. Ketoconazole is used to treat infections such as athlete’s foot, ringworm, jock itch and certain kinds of dandruff. Common side effects are vomiting, nausea, skin rash or itching, abdominal or stomach pain. Ketoconazole comes in many forms like tablets, cream, powder, soap & shampoo.