Which of the following is 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.