Increased AUC of midazolam. Terfenadine, astemizole, cisapride, Ca channel blockers. Closely monitor w/ ciclosporin. Other medicinal products inhibiting drug oxidation eg, cimetidine & ketoconazole. Increased effect of warfarin & other coumarin anticoagulants. Medicinal products known to prolong the QT interval or medicinal products able to induce Torsade de pointes eg, class IA (eg, quinidine, disopyramide) or class III (eg, amiodarone, sotalol, dofetilide, ibutilide) antiarrhythmic medicinal products, methadone, moxifloxacin, antipsychotics.