Butabarbital will lower the level or effect of nitrendipine by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Importance Not known. butabarbital will decrease the level or influence of glecaprevir/pibrentasvir by influencing hepatic/intestinal enzyme CYP3A4 metabolism. butabarbital will decrease the extent or impact of levoketoconazole by influencing hepatic/intestinal... https://andyz304czn8.wikilinksnews.com/user