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Iclepertin

Clinical data
Other names	BI 425809
Legal status
Legal status	Investigational
Identifiers
CAS Number	1421936-85-7
PubChem CID	155259577
UNII	M43ZDU10DD
Chemical and physical data
Formula	C20H18F6N2O5S
Molar mass	512.42 g·mol

Iclepertin (developmental code name BI 425809) is an investigational nootropic to enhance the cognition and functional capacity in schizophrenia developed by Boehringer Ingelheim. As of May 2020, it is in phase III of clinical trial under the code name CONNEX-3. BI 425809 is an inhibitor of glycine transporter 1 (Gly-T1) that in phase II improved cognition after 12 weeks in patients with schizophrenia. Doses of 10 mg and 25 mg showed the largest separation from placebo. If these encouraging results are confirmed in phase 3 trials, BI 425809 could provide an effective treatment for cognitive impairment associated with schizophrenia. Schizophrenia is characterized by abnormalities in glutamatergic pathways related to NMDA receptor hypofunction. Inhibition of GlyT1 on the presynaptic membrane or astrocytes is hypothesized to increase glycine levels within the synapse. The NMDA receptor function may be enhanced by increasing levels of its co-agonist, glycine, within the synaptic cleft, which may lead to improvements in cognitive function.

References

1. Clinical trial number NCT04860830 for "A Phase III Randomized, Double-blind, Placebo-controlled Parallel Group Trial to Examine the Efficacy and Safety of BI 425809 Once Daily Over 26 Week Treatment Period in Patients With Schizophrenia (CONNEX-3)" at ClinicalTrials.gov
2. Fleischhacker WW, Podhorna J, Gröschl M, Hake S, Zhao Y, Huang S, et al. (March 2021). "Efficacy and safety of the novel glycine transporter inhibitor BI 425809 once daily in patients with schizophrenia: a double-blind, randomised, placebo-controlled phase 2 study". The Lancet. Psychiatry. 8 (3): 191–201. doi:10.1016/S2215-0366(20)30513-7. PMID 33610228. S2CID 231986987.
3. Rosenbrock H, Desch M, Kleiner O, Dorner-Ciossek C, Schmid B, Keller S, et al. (November 2018). "Evaluation of Pharmacokinetics and Pharmacodynamics of BI 425809, a Novel GlyT1 Inhibitor: Translational Studies". Clinical and Translational Science. 11 (6): 616–623. doi:10.1111/cts.12578. PMC 6226115. PMID 30136756.

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