Lamisil 1% Cream is a topical antifungal medication used to treat a variety of skin infections caused by fungi. It contains the active ingredient terbinafine, which works by inhibiting the growth of fungi. Lamisil is commonly used to treat conditions like: Athlete's foot (tinea pedis), Jock itch (tinea cruris), Ringworm (tinea corporis),Fungal infections of the skin.