butabarbital will lower the level or impact of nicardipine by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Monitor.butabarbital will minimize the level or influence of pioglitazone by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Small/Significance Unknown.Teniposide: Barbiturates may perhaps lower the serum focus o… Read More