Itraconol Soap is an antifungal medicine used to treat skin, fingernail, and toenail infections by killing fungi by destroying their cell membrane. It is for external use only and should be used as directed by a doctor. Common side effects include skin irritation, redness, and itching. It is important to consult a doctor if side effects persist or if you have used other antifungal medicines or are pregnant or breastfeeding.