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Mechanism of Action# NMDA glycine-site partial agonism: Enhances NMDA receptor activity at the glycine modulatory site, increasing synaptic plasticity BDNF/mTOR signaling: Activates the same downstream pathways as ketamine (BDNF release, mTOR activation) that are thought to underlie rapid antidepressant effects Metaplasticity: Produces long-lasting changes in the capacity for synaptic plasticity in the prefrontal cortex and hippocampus No dissociation: Unlike ketamine, rapastinel does not produce dissociative, psychotomimetic, or cognitive-impairing effects Research Findings# Phase 2 success: Single IV doses of 5-10 mg/kg produced significant antidepressant effects within 24 hours as adjunctive therapy, sustained for 7+ days Phase 3 failure: All three pivotal phase 3 trials (2019) failed to differentiate from placebo on primary endpoints, likely due to high placebo response rates Safety profile: Remarkably well tolerated -- no dissociation, no abuse potential, no cognitive impairment Legacy: Spurred development of next-generation NMDA modulators including zelquistinel (an oral compound) Lessons Learned# Rapastinel's story highlights two critical challenges in depression drug development: (1) the placebo response problem, where placebo response rates in depression trials can reach 30-40%, making it difficult for active drugs to achieve statistical separation