Niacin, also called nicotinic acid, is a B vitamin (vitamin B3). It occurs naturally in plants and animals, and is also added to many foods as a vitamin supplement. It is also present in many multiple vitamins and nutritional supplements.
Niacin is used to treat and prevent a lack of natural niacin in the body, and to lower cholesterol and triglycerides (types of fat) in the blood. It is also used to lower the risk of heart attack in people with high cholesterol who have already had a heart attack. It is sometimes used to treat coronary artery disease (also called atherosclerosis).
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Abdominal or stomach pain
feeling of warmth
flushing or redness of the skin, especially on the face and neck
nausea or vomiting
rash or itching
Incidence not known:
Dizziness or faintness
dryness of the skin
muscle aching or cramping
side, lower back, or stomach pain
swelling of the feet or lower legs
unusual tiredness or weakness
unusually fast, slow, or irregular heartbeat
Usual Adult Dose for Niacin Deficiency 10 to 20 mg orally once a day. Niacin may also be administered parenterally as a component of injectable multivitamin additives contained in parenteral nutrition products.