Terbinafine Tablets USP 250 mg are oral antifungal tablets used to treat fungal infections of the skin, hair, and nails, including conditions like onychomycosis, athlete’s foot, ringworm, and jock itch. Terbinafine works by inhibiting the enzyme squalene epoxidase, which disrupts fungal cell membrane formation, leading to the death of the fungus. It is fungicidal in action and particularly effective against dermatophytes.