It was studied different prophylactic action of Hydazepam and Cynazepam on changes in integral signs of antiviral resistance of an organism by the condition of the chronic stress syndrome. It was established that the both drugs didn’t destroy natural stimulation of antiviral defense at the beginning and at the resistance stage of stress. In the end stage of stress these drugs led to decreasing of its negative influence on the intensity of viral inducted interferon genesis, reserved the cytopathogenic activity of K-cells of blood by the condition of grippe A infection in poststress period and decreasing mortality from this viral infection.
