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SAGE-421 is an investigational **oral small molecule drug** that acts as a **positive allosteric modulator (PAM) of the NMDA receptor**. It is being developed by Sage Therapeutics for potential use in **neurodevelopmental disorders** and for **cognitive recovery and rehabilitation**, targeting CNS conditions where NMDA receptor modulation may be beneficial[1][6]. The drug is currently at the preclinical development stage[1][5][6].
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