Participants on potent CYP3A4 inhibitors (fluconazole, ketoconazole, itraconazole, erythromycin, rifampin) and some anticonvulsants (e.g., phenytoin, phenobarbital, and carbamazepine) will be excluded since these medications impact the metabolism of mifepristone (see Risk/Benefit Assessment for details). Due to an increased risk of adverse drug reactions, Veterans taking simvastatin, lovastatin, fentanyl, pimozide, bupropion, nefazodone, dihydroergotamine, ergotamine, quinidine, sirolimus, carvedilol, propanolol, diltiazem, verapamil or tacrolimus will also be excluded. Since the impact of mifepristone on the male reproductive system has not been extensively studied, only Veterans willing to use effective means of birth control for up to 90 days after mifepristone ingestion will be eligible; this will cover the critical period of fetal development.