Esketamine (also (S)-ketamine or S(+)-ketamine) (brand: Ketanest S) is a general anaesthetic and a dissociative. It is the S(+) enantiomer of the drug ketamine a general anaesthetic. Esketamine is primarily an NMDA receptor antagonist. As of July 2013 it is being tested in US FDA clinical trials as an antidepressant.
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