pentobarbital will lower the extent or result of mifepristone by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Watch. CYP3A4 inducers haven't been examined, coadministration not proposed by manufacturerpentobarbital will decrease the level or outcome of conjugated estrogens by impacting hepatic/intestinal enzyme CYP3A4 metabo