Butabarbital will decrease the extent or impact of nitrendipine by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Minimal/Importance Not known. butabarbital will lower the extent or effect of estrogens esterified by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Monitor. butabarbital will reduce the extent or result of diazepam intranasal by affecting hepat... https://cassl329mxa8.celticwiki.com/user