butabarbital will minimize the level or effect of sulfamethoxazole by influencing hepatic enzyme CYP2C9/10 metabolism. Small/Significance Unfamiliar.butabarbital will decrease the extent or impact of levamlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism.butabarbital will lessen the level or result of diazepam intranasal by impactin