butabarbital will lessen the extent or outcome of fedratinib by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Stay away from or Use Alternate Drug. Influence of coadministering a robust CYP3A4 inducer with fedratinib hasn't been studied.butabarbital will lessen the level or result of conivaptan by affecting hepatic/intestinal enzyme CYP3A4… Read More