[A comparative study of the central H-cholinergic-blocking and NMDA-blocking actions of MK-801, memantin, amantadine, pyrilen and IEM-1754 in experiments on intact rats].

Pyrilene acts as a central H-cholinoblocker upon intramuscular injection at a dose of 0.02-0.08 mg/kg, and as an NMDA-blocker, when the dose is increased to 0.2-0.8 mg/kg. Similarly, amantadine exhibits the properties of H-cholinoblocker and NMDA-blocker in the dose intervals 10-15 mg/kg and 120-180 mg/kg, respectively. The activity of MK-801 markedly exceeds that of memantine, although close doses of both NMDA-blockers inhibit the NMDA and corazole effects, as well as the central effects (analgesia and seizure) of nicotine, thus showing no significant selectivity with respect to NMDA. IEM-1754 tested on intact animals exhibited a selective action upon the NMDA receptors, preventing the NMDA-induced analgesia and lethality and the corazole-induced convulsions at doses 10-100 times lower as compared to those preventing nicotine-induced seizure and analgesia.