Elagolix is a highly potent, selective, orally-active, short-duration, non-peptide antagonist of the gonadotropin-releasing hormone receptor (GnRHR) (KD = 54 pM).Target: GnRHin vitro: Elagolix is a short-acting, nonpeptide, GnRH antagonist, administered orally, that unlike injectable depot GnRH agonists and antagonists, produces a dose-dependent suppression of ovarian estrogen production, that is, from partial suppression at lower doses to full suppression at higher doses. Elagolix is regarded as the frontrunner of a new class of GnRH inhibitors that have been denoted as second-generation, due to their non-peptide nature and oral bioavailability.

References:
[1]. Carr B, et al. Elagolix, an oral GnRH antagonist, versus subcutaneous depot medroxyprogesterone acetate for the treatment of endometriosis: effects on bone mineral density. Reprod Sci. 2014 Nov;21(11):1341-1351.