... death, uterine induction of labor, etc. Description: Mifepristone is a synthetic steroid compound with both antiprogesterone and ... antagonizes cortisol action competitively at the receptor level. Mifepristone is a progesterone receptor antagonist used as an abortifacient ... It is also a powerful glucocorticoid receptor antagonist, Mifepristone was the first antiprogestin to be developed and it ...