Tenocyclidine (TCP) is a dissociative anesthetic drug with psychostimulant and hallucinogenic effects. This drug shows a broad spectrum of pharmacological activity including antidotal effect in organophosphorus compounds poisoning, radioprotective and anticancer effects. It was studied that the antidotal potency could protect acetylcholinesterase (AChE) in the case of organophosphate poisoning. However, the controversial role of TCP in brain protection should be studied further. Tenocyclidine has a high affinity for the N-methyl-D-aspartate (NMDA) receptors. This property allows using of TCP binding (association rate) as a marker of channel opening and thereby permitting measurement of NMDA receptor activation and ligand binding under identical conditions.