Rationale: Acute cognitive impairment and abuse potential of ketamine incentivizes the search for alternatives to ketamine for clinical management of treatment-resistant depression. Recently, (2R,6R) hydroxynorketamine ((2R,6R)-HNK), a metabolite of ketamine, has shown promise due to its reported lack of ketamine-like reinforcing properties. Nonetheless, the effect of (2R,6R)-HNK on cognition has not been reported.
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