154 oral contraceptives ("the Pill") any medicines used to treat diseases related to the acid in the stomach (e. g. antacids, H2- blockers and proton pump inhibitors) medicines to lower blood pressure, to slow heart rate, or to correct heart rhythm simvastatin, lovastatin, and atorvastatin (used to lower blood cholesterol) nevirapine and efavirenz (used to treat HIV) cyclosporin, tacrolimus, and sirolimus (medicines to decrease the effects of body's immune system) certain antibiotics (rifabutin, clarithromycin) ketoconazole, itraconazole, and voriconazole (antifungals) warfarin (anticoagulant, used to reduce the blood clots) irinotecan (used to treat cancer) sedative agents (e. g. midazolam administered by injection) buprenorphine (used to treat opioid addiction and pain).