These include: • Vincristine, vinblastine and other vinca alkaloids (used to treat cancer) • Ciclosporin (used in transplant surgery) • Tacrolimus and sirolimus (used in transplant surgery) • Rifabutin (used to treat certain infections) • Medicines used to treat HIV called protease inhibitors (including lopinavir and atazanavir, which are given with ritonavir) and non nucleoside reverse transcriptase inhibitors (NNRTIs) • Midazolam, triazolam, alprazolam and some similar medicines called benzodiazepines (used as sedatives or muscle relaxants) • Diltiazem, verapamil, nifedipine, nisoldipine and some of the other medicines called calcium channel blockers (used to treat high blood pressure) • Digoxin (used to treat heart failure) • Sulfonylureas such as glipizide (used to treat high blood sugar).