It has been shown that the tranquilizers, diazepam (a 1,4-benzodiazepine derivative) and mebicar (a derivative of bicyclic bisureas) produce one-line inhibition of the production of the conditioned reflex of active avoidance in rats and of their "open-field" motor activity. Both the drugs change the balance of neuroactive amino acids in the animals' brain. However they produce different changes: diazepam increases the content of asparaginic and glutamic acids, while mebicar raises that of gamma-butyric acid. No interrelationship was found between psychotropic and vegetotropic effects of the tranquilizers.
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