Ciclopirox Products | Cleanchem - Ciclopirox is an antifungal agent used to treat a variety of fungal infections, including athlete? foot, ringworm, and seborrheic dermatitis. It works by inhibiting fungal cell membrane synthesis and disrupting the growth of fungal cells. Ciclopirox is available in various topical forms, such as creams, shampoos, and nail lacquers. Side effects may include skin irritation, redness, or itching at the application site.