ArticleClinical drug investigation2025
The Effect of Multiple Oral Doses of a Glycine Transporter 1 Inhibitor, Iclepertin (BI 425809), on the Steady-state Pharmacokinetics of a Combined Oral Contraceptive Containing Ethinylestradiol and Levonorgestrel: a Phase I Clinical Trial in Healthy Females.
Article in Clinical drug investigation, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT05613777 (The Effect of Multiple Doses of BI 425809 on the Pharmacokinetics of Multiple Doses of a Combination of Ethinylestradiol and Levonorgestrel Following Oral Administration in Healthy Premenopausal Female Subjects), which is not on this map. Not yet cited in PubMed.
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The Effect of Multiple Doses of BI 425809 on the Pharmacokinetics of Multiple Doses of a Combination of Ethinylestradiol and Levonorgestrel Following Oral Administration in Healthy Premenopausal Female Subjects (an Open-label, Two-period, Fixed Sequence Design Trial With run-in Period)
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5 authors.
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Abstract
backgroundIclepertin is a selective inhibitor of glycine transporter 1 recently investigated as a novel treatment for cognitive impairment associated with schizophrenia. Iclepertin is a potential mild inducer of liver cytochrome P450 3A4, which metabolises ethinylestradiol and levonorgestrel, which are used in combined oral contraceptives (OCs).
objectivesThis trial investigated the potential drug interaction effect of steady-state iclepertin on the steady-state pharmacokinetics of combined OCs.
methodsThis phase I, non-randomised, open-label, two-period, fixed-sequence trial was conducted in healthy pre-menopausal female volunteers aged 18-35 years. In period 1, participants received a combined OC (ethinylestradiol 30 µg/levonorgestrel 150 µg once daily; reference treatment). In period 2, participants received a combined OC and iclepertin 10 mg once daily (test treatment). Primary pharmacokinetic endpoints of ethinylestradiol or levonorgestrel in plasma at steady state over a uniform dosing interval τ were area under the concentration-time curve (AUC
resultsIn total, 19 participants entered the trial; 17 were treated (periods 1 and 2). Steady-state pharmacokinetics of ethinylestradiol and levonorgestrel were similar with and without iclepertin; geometric mean ratios for AUC
conclusionIclepertin 10 mg had no meaningful effect on the pharmacokinetics of ethinylestradiol and levonorgestrel, suggesting that these drugs can be administered concomitantly.
trial registrationClinicalTrials.gov (NCT05613777; registered on 18 October 2023).
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