Statins (simvastatin/lovastatin), certain antiarrhythmics (quinidine/dofetilide), benzodiazepines (midazolam/triazolam), calcium channel blockers, digoxin, warfarin, oral hypoglycemics, carbamazepine/phenytoin/rifampicin (reduce effect), PPIs/H2 blockers/antacids (reduce absorption)