AZD8529 is a selective metabotropic glutamate receptor 2 (mGluR2) positive allosteric modulator (PAM) th at potentiates DCG-IV-induced GTPγS binding to membrane from human mGluR2, but not mGluR1/3/4/5/6/7/8, CaR/Gqi5 fusion-expressing HEK293 cells (EC50/Emax = 285 nM/59.9%) with no mGluR agonist/antagonist activity and little or no affinity toward a panel of 50 other receptors. AZD8529 is shown to reduce nicotine self-administration and cue-induced reinstatement of nicotine-seeking responses in squirrel monkeys (0.3-10 mg/kg i.m.) and rats (1.75-58.3 mg/kg) as well as cue-induced methamphetamine seeking in rats (20 and 40 mg/kg s.c.) in vivo.