butabarbital will decrease the level or impact of fedratinib by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Keep away from or Use Alternate Drug. Influence of coadministering a robust CYP3A4 inducer with fedratinib hasn't been examined.butabarbital will decrease the level or effect of fosphenytoin by influencing hepatic enzyme CYP2C9/t… Read More