Pharmacology General 67b106b5 Which is Cytochrome P450 inhibitor? A Ketoconazole B Rifampicin C Phenytoin D INH High-Yield Explanation Impoant microsomal enzyme inhibitors are: Valproate Ketoconazole Cimetidine Ciprofloxacin Erythromycin Isoniazid Ref: K.D.T 6th Ed Page 27,28.