Dose-Dependent Suppression of Gonadotropins and Ovarian Hormones by Elagolix in Healthy Premenopausal Women.
Elagolix is a nonpeptide, oral gonadotropin-releasing hormone (GnRH) antagonist being developed for sex-hormone-dependent diseases in women.



We evaluated the pharmacokinetics and pharmacodynamics of elagolix.



This study was a randomized, double-blind, placebo-controlled, multiple-ascending dose study in 45 healthy premenopausal women at a research unit.



Elagolix [150 mg once daily or 100, 200, 300, or 400 mg twice daily (BID)] or placebo was administered for 21 days.



Main outcome measures were elagolix pharmacokinetics, suppression of gonadotropics [follicle-stimulating hormone (FSH), luteinizing hormone (LH)] and ovarian hormones [estradiol (E2), progesterone (P)], and adverse events.



Elagolix was rapidly absorbed after oral dosing, reaching maximum concentrations at 1.0 to 1.5 hours, with a half-life of 4 to 6 hours. FSH, LH, and E2 were suppressed within hours of elagolix administration on day 1. Dose-dependent suppression of E2 was observed, with maximum suppression achieved with elagolix 200 mg BID. Dose-dependent suppression of FSH and LH was also observed, with maximal or near-maximal suppression achieved at 300 mg BID and 200 mg BID, respectively. At elagolix doses ≥100 mg BID, P concentrations remained at anovulatory levels throughout 21 days of dosing. The most frequently reported adverse events were headache and hot flush.



Elagolix administration allows for modulation of gonadotropin and ovarian hormone concentrations, from partial suppression at lower doses to nearly full suppression at higher doses. The results of this study provide a rationale for elagolix dose selection for treatment of sex hormone-dependent diseases in women.
Clinical Pharmacology and Pharmacometrics, AbbVie Inc., North Chicago, Illinois 60064.
Juki
J
Ng
General Medicine, AbbVie Inc., North Chicago, Illinois 60064.
Kristof
K
Chwalisz
Clinical Pharmacology and Pharmacometrics, AbbVie Inc., North Chicago, Illinois 60064.
David C
DC
Carter
Clinical Pharmacology and Pharmacometrics, AbbVie Inc., North Chicago, Illinois 60064.
Cheri E
CE
Klein
D000328:Adult; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D004958:Estradiol / Q000378:metabolism*; D005260:Female; D005640:Follicle Stimulating Hormone / Q000378:metabolism*; D007987:Gonadotropin-Releasing Hormone / Q000037:antagonists & inhibitors; D064368:Healthy Volunteers; D006727:Hormone Antagonists / Q000494:pharmacology*; D006801:Humans; D006845:Hydrocarbons, Fluorinated / Q000494:pharmacology*; D007986:Luteinizing Hormone / Q000187:drug effects* / Q000378:metabolism; D008875:Middle Aged; D017697:Premenopause; D011374:Progesterone / Q000378:metabolism*; D011743:Pyrimidines / Q000494:pharmacology*; D055815:Young Adult
D006727:Hormone Antagonists; D006845:Hydrocarbons, Fluorinated; D011743:Pyrimidines; D007987:Gonadotropin-Releasing Hormone; D011374:Progesterone; D004958:Estradiol; C539351:elagolix; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone