pentobarbital will decrease the extent or effect of mifepristone by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Keep an eye on. CYP3A4 inducers have not been studied, coadministration not suggested by companypentobarbital will minimize the level or outcome of etoposide by impacting hepatic/intestinal enzyme CYP3A4 metabolism.