The aim of the study was to investigate the effects of allicor (a long-action garlic-based preparation) on the risk of acute myocardial infarction (MI) and sudden death (SD) in patients with coronary artery disease (CAD). Fifty one CAD patients were included in this double-blind placebo-controlled study. The prognostic risk of MI and SD during ten following years was counted using Cox proportional hazards model based on the results of Munster study. Allicor administered for 12 months was demonstrated to reduce absolute ten-year risk of acute MI and SD 1.5 times in men and 1.3 times in women. The reduction in calculated risk parameters was associated with changes in blood plasma lipid profile, the most significant of which was reduction in the level of low density lipoprotein cholesterol (p < 0.05) by 32.9 mg/dl in men and 27.3 mg/dl in women. The results of this study demonstrate that allicor is effective for the reduction of multifactor MI and SD risk as a means of secondary CAD prophylaxis.