Terbinafine-d 3 (hydrochloride) is the deuterium labeled Terbinafine hydrochloride. Terbinafine hydrochloride (TDT 067 hydrochloride) is an antifungal medication used to treat fungal infections. It is a potent non-competitive inhibitor of squalene epoxidase from Candida with a Ki of 30 nM. Terbinafine hydrochloride also antibacterial activity against certain Gram-positive and Gram-negative bacteria.