Which of the following is a P-glycoprotein inhibitor: (A) Rifampicin, (B) Phenytoin, (C) Griseofulvin, (D) Ketoconazole
Answer is D. Drugs like Cyclosporine, Tacrolimus, Quinidine, Diltiazem, Verapamil, Itraconazole, Ketoconazole, Amiodarone inhibit P-glycoprotein and cause drug toxicity.