Terbinafine Hydrochloride USP For Compounding (API)Terbinafine Hydrochloride USP for Compounding (API) is an active pharmaceutical ingredient used in the preparation of tailored antifungal medications. It is particularly effective in treating fungal infections such as athlete's foot, jock itch, ringworm, and onychomycosis (fungal nail infections). Terbinafine works by inhibiting the enzyme squalene epoxidase, which is crucial for fungal cell membrane synthesis, ultimately leading to cell death.