Concomitant use w/ alcohol; amiodarone, astemizole, terfenadine, disulfiram, phenytoin, phenobarb, fluorouracil, carbamazepine, lithium, oral anticoagulants, cyclosporine, cimetidine, acenocoumarol, anisindione, dicoumarol, phenindione, phenprocoumon, warfarin, cisapride, fosphenytoin, fentanyl, glimepiride, oxybutynin, oxycodone, pimozide, tolterodine, trimetrexate & propranolol.