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A cyclohexanone derivative and S-enantiomer of racemic ketamine, with analgesic, anesthetic and antidepressant activities. Although the mechanism of action is not fully understood, upon administration, esketamine targets, non-competitively binds to, and blocks N-methyl D-aspartate (NMDA) receptors. This reduces pain perception, induces sedation, and produce dissociative anesthesia.
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