“…The most commonly reported medications are MTX and KCl. 13,21,27,35,41,44,46,51 Administration of intraamniotic prostaglandins F2α have also been described by Spitzer et al and Vega et al 59,60 Mefiprestone administered along with MTX to induce feticide has been reported by Pathak et al and Shreshta et al 43,48 In the presence of progesterone, mifepristone acts as a competitive receptor antagonist at the progesterone receptor. Mifepristone induces decidual breakdown indirectly, leading to trophoblast detachment and resulting in decreased syncytiotrophoblast production of HCG, which in turn causes decreased production of progesterone by the corpus luteum.…”