Butabarbital will decrease the level or effect of fedratinib by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Steer clear of or Use Alternate Drug. Impact of coadministering a strong CYP3A4 inducer with fedratinib hasn't been analyzed. butabarbital will reduce the level or result of glecaprevir/pibrentasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Butabarbital https://fredj012duf4.wikilinksnews.com/user