Ciclopirox is a topical prescription antifungal medication that is used to treat fungal infections of the fingernails, toenails, and skin. It can also be prescribed to treat seborrheic dermatitis in the form of shampoo. It works by disrupting the cell membrane of the fungus, which prevents it from growing and multiplying. Ciclopirox is generally well tolerated, with few side effects. The most common side effects include skin irritation, redness, and itching. Ciclopirox should not be used on open wounds or on broken skin.
Ciclopirox is currently available under the brand name Penlac. It comes in the form of a topical solution that is applied like nail polish to the toenails and fingernails but can also be prescribed for other fungal infections and seborrheic dermatitis in the form of a cream/gel or shampoo.