certain medicines to control the heart rhythm (e.g., amiodarone, disopyramide, dofetilide, flecainide, ibutilide, quinidine, procainamide, propafenone, sotalol) chloroquine cisapride diltiazem grapefruit juice medicines for fungal infections (fluconazole, itraconazole, ketoconazole, voriconazole) ...