The paper presents the results of unstable angina pectoris treatment in 121 patients who received or did not receive (65 and 56 patients, respectively) contrykal in a dose of 20,000 units as an adjuvant to standard treatment (analgetics, tranquilizers, vasodilators). All the patients were admitted to cardiological departments. The comparative assessment of the data favours contrykal infusions in emergency prehospital care of developing unstable angina pectoris. The drug produces a cardioprotective effect reducing the risk of macrofocal myocardial infarction.