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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  • Niacin SR
  • Abdominal or stomach pain
    cough
    diarrhea
    feeling of warmth
    flushing or redness of the skin, especially on the face and neck
    headache
    nausea or vomiting
    rash or itching
    runny nose
    sneezing
    stuffy nose
    Incidence not known:
    Dizziness or faintness
    dryness of the skin
    fever
    frequent urination
    joint pain
    muscle aching or cramping
    side, lower back, or stomach pain
    swelling of the feet or lower legs
    unusual thirst
    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.