(S)-Amisulpride (Esamisulpride) is a potent dopamine D2/D3 receptor antagonist. (S)-Amisulpride is an antagonist at the 5-HT7 receptor with a KI of 900 nM. (S)-Amisulpride has antipsychotic and antidepressant effects[1][2].
(S)-Amisulpride (Esamisulpride) displays high affinity binding at both D2 and D3 receptors and is approximately twice as potent as racamisulpride and 20-50 times more potent than (R)-amisulpride at these receptors[2]
The (S)-amisulpride (10mg/kg, s.c.) stimulus is rapidly acquired and was shown to be dose-related, time dependent (effective between 30 and 120min) and stereoselective male C57BL/6 mice[1].
[1]. Timothy J Donahue, et al. (S)-amisulpride as a discriminative stimulus in C57BL/6 mice and its comparison to the stimulus effects of typical and atypical antipsychotics. Eur J Pharmacol. 2014 Jul 5;734:15-22.
[2]. Vincent Grattan, et al. Antipsychotic Benzamides Amisulpride and LB-102 Display Polypharmacy as Racemates, S Enantiomers Engage Receptors D2 and D3, while R Enantiomers Engage 5-HT7. ACS Omega. 2019 Aug 15;4(9):14151-14154.