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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.
A: Niacin, or nicotinic acid, is a B-complex vitamin. Niacin is used with dietary changes, such as a restriction of cholesterol and fat intake, and with or without other medications in people with high cholesterol.: Niacin is a B complex vitamin. Niacin is used to reduce total cholesterol, bad cholesterol and its components (LDL and Apo B) and triglycerides, and to increase good cholesterol (HDL) in patients with cholesterol disorders.