Sulfaphenazole is a sulfonamide that is sulfanilamide in which the sulfonamide nitrogen is substituted by a 1-phenyl-1H-pyrazol-5-yl group. It is a selective inhibitor of cytochrome P450 (CYP) 2C9 isozyme, and antibacterial agent. It has a role as an antibacterial drug, a P450 inhibitor, an EC 1.14.13.181 (13-deoxydaunorubicin hydroxylase) inhibitor and an EC 1.14.13.67 (quinine 3-monooxygenase) inhibitor. It is a member of pyrazoles, a sulfonamide, a substituted aniline, a primary amino compound and a sulfonamide antibiotic.
