[A comparative analysis of the effect of nootropic preparations with different chemical structures on the failure of the escape reaction in rats].

The nootropic agents pyroglutamyl-D-alanine amide (TGS-20), mechlofenoxate, and mexidole versus piracetam were tested for their effects on the reversible impairments of cognitive brain functions, on the demolition of active avoidance responses in rats. TGS-20 (1 mg/kg/day) and mexidole (10 mg/kg/day) injected intraperitoneally 30 minutes prior to the experiment showed a normalizing effect in smaller doses than did piracetam (300 mg/kg/day). Mechlofenoxate (50 mg/kg/day) displayed a lower protective effect.