Terbinafine is an antifungal medication commonly used to treat fungal infections of the skin and nails. It works by inhibiting the growth of fungi, helping to eliminate infections such as athlete's foot, ringworm, and nail fungus. Terbinafine can be taken orally in tablet form or applied topically as a cream or solution. This medication is generally well-tolerated, but some people may experience side effects like gastrointestinal issues or skin reactions. It is important to follow a healthcare provider's instructions when using terbinafine to ensure effective treatment and minimize potential risks.