A composition is provided which contains policosanol and HMG-Co-A reductase inhibitor and which may be used for treating and or reducing hypercholesterolemic diseases, total cholesterol, LDL-cholesterol, coronary heart disease (heart attacks and strokes), inflammation, deep-vein thrombosis immunoregulatory diseases, cardiovascular diseases, and/or neurodegenerative disorders in humans and animals. The method comprises administering policosanol and HMG-Co-A reductase inhibitor which together effectively lower serum cholesterol levels. Typically, the administered composition includes about 0.1-10:1 parts by weight of policosanol to HMG-Co-A reductase inhibitor.