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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, Vitamin B3, is a water soluble vitamin that is well regulated by the body, thus overdose is rare, and only occurs when niacin is taken in the form of supplements. An overdose of niacin is seen in the form of skin rashes (flush), dry skin, various digestive maladies. A long term overdose can lead to liver damage, elevated blood sugar levels and type II diabetes, as well as increased risk of birth defects. The current DV for Niacin (Vitamin B3) is 20mg.