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When it's used as a treatment to increase your HDL cholesterol or correct a vitamin deficiency, niacin is sold in higher doses that are prescribed by your doctor. Prescription-strength niacin includes such drugs as Niacor and Niaspan. Niacin is also available as an over-the-counter supplement.
Niacin, also called nicotinic acid, is a B vitamin (vitamin B3) used in vitamin supplements and in combination with prescription drugs. It is most often used to prevent cardiovascular disease.iacin is used as a vitamin supplement to treat a lack of natural niacin in the body, to lower the risk of heart attack in people with high cholesterol who have already had a heart attack, and to treat coronary artery disease. Niacin is sold by prescription and over-the-counter OTC).