Butabarbital will reduce the extent or result of fedratinib by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Influence of coadministering a solid CYP3A4 inducer with fedratinib has not been examined. butabarbital will decrease the extent or outcome of conivaptan by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Watch. https://heinzd566lie3.wikilentillas.com/user