Butabarbital will lower the level or influence of nitrendipine by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Slight/Importance Unidentified. butabarbital will lower the extent or influence of conivaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Keep track of. butabarbital will decrease the level or impact of ritonavir by impacting hepatic/intest... https://kinkyb013ggm5.blogitright.com/profile