Verapamil and amlodipine produced a potent antiischemic effect and reduced the area of myocardial infarction in rats. The observed changes were accompanied by inhibition of lipid peroxidation. In contrast to verapamil, amlodipine in a dose of 50 ng/ml in vitro decreased hemoglobin affinity for oxygen. Moreover, amlodipine in a concentration of 2 ng/ml decreased the content of malonic dialdehyde and activity of superoxide dismutase in the blood.