butabarbital will lower the extent or effect of nicardipine by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Check.butabarbital will lower the extent or impact of midazolam by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Watch.butabarbital will decrease the extent or impact of eltrombopag by influencing