Korlym (mifepristone) is a cortisol receptor blocker for oral administration. The chemical name of mifepristone is 11?-(4-dimethylaminophenyl)-17?-hydroxy-17?-(1-propynyl)-estra-4, 9-dien-3-one. The chemical formula is C29H35NO2; the molecular weight is 429.60; and the structural formula is:

Mifeprex tablets each contain 200 mg of mifepristone, a synthetic steroid with antiprogestational effects. The tablets are light yellow in color, cylindrical and biconvex, and are intended for oral administration only. The tablets include the inactive ingredients colloidal silica anhydrous, corn starch, povidone, microcrystalline cellulose, and magnesium stearate.