Dynamics of glutathione-related enzymes activity was studied in erythrocytes of 22 dogs with destructive form of cholecystitis. As clinical symptoms of intoxication developed the enzymatic activity was decreased. In the animals with purulent-inflammatory complications distinct decrease was detected in activity of glutathione reductase (by 54.3%), glutathione-S-transferase--by 46.94% and glutathione peroxidase--by 42.1% (P less than 0.05). These data suggest that specific methods should be chosen for correction of impairments in the enzymatic activity in order to improve the treatment course efficiency as well as for prophylaxis of complications. The procedure developed for cholecystitis treatment, which involved channelled transport of antibiotics by means of autologous erythrocyte ghosts, proved to be more effective as compared with routine methods as shown by evaluation of the animals clinical state as well as by dynamics of hepato-specific enzymes activity and the glutathione-related enzymes activity. This procedure may be used in clinical practice; the laboratory tests described may serve for evaluation of the treatment course efficiency.