A muscarinic acetylcholine receptor antagonist (Kds = 48, 213, 120, 170, and 129 nM for M1-M5 mAChRs, respectively); decreases oxotremorine-induced muscle activity in rabbits at 2-5 mg/kg; an NMDA receptor antagonist (Ki = 6 µM in human postmortem frontal cortex; IC50 = 16.2 µM in cultured superior colliculus neurons)