ADX-47273 is a research pharmaceutical developed by Addex Therapeutics. It is a novel positive allosteric modulator of the metabotropic glutamate receptor subtype 5 (mGluR5). ADX-47273 displays antipsychotic, neuromodulatory, and cognition enhancing activities. In vivo, ADX 47273 increases waking and decreases deep sleep behaviors; it also increases late phase long-term potentiation (LTP) and enhances adaptive learning. In other animal models, ADX-47273 decreases amphetamine- and phencyclidine-induced hyperlocomotion and accumbal dopamine levels.