butabarbital will lessen the extent or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Check.butabarbital will decrease the extent or impact of levamlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism.butabarbital will minimize the extent or outcome of pimozide by impacting hepatic/intestinal… Read More