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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.
GENERIC NAME: niacin, nicotinic acid, vitamin B3. DRUG CLASS AND MECHANISM: Niacin (nicotinic acid, vitamin B3) is a part of the normal diet that is essential to various chemical reactions in the body. It is used medically to treat individuals with deficiency of niacin.