ArticleClinical pharmacokinetics2026
Pharmacokinetic-Pharmacodynamic Modeling and Simulation of Merigolix, a Nonpeptide Gonadotropin-Releasing Hormone Antagonist.
Article in Clinical pharmacokinetics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Gonadotropin-releasing hormone (GnRH) antagonists inhibit estrogen synthesis and secretion, making them promising treatment options for estrogen-dependent diseases, such as endometriosis. This study developed a population pharmacokinetic/pharmacodynamic (PK/PD) model for merigolix, a novel oral GnRH antagonist, to determine its optimal dosing in the treatment of endometriosis. Population PK/PD modeling was performed using NONMEM 7.4, incorporating data from phase I clinical studies involving single and multiple ascending dose (SAD and MAD) trials in healthy premenopausal volunteers. The PK profile was characterized using a two-compartment model incorporating first-order absorption and elimination processes. The temporal delay between merigolix concentration and subsequent estradiol (E2) suppression was described using an indirect response turnover model. The models were evaluated via visual predictive checks, goodness-of-fit plots, and bootstrap analysis. The PK model described merigolix concentrations across various doses (estimated clearance: 549 L/h, central volume of distribution: 1690 L). The PD model demonstrated dose-dependent E2 suppression (estimated maximum inhibitory effect [I
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