Itraconazole is a systemic antifungal medication used to treat fungal infections such as ringworm and blastomycosis. Indication: Itraconazole works by inhibiting the fungal enzymes that produce “ergosterol,” an important component of the fungal cell wall. Without adequate ergosterol, the fungal cell becomes weak, leaky and ultimately dies. Active Ingredient : Itraconazole 100mg Package Size : Dispensed according to prescription.