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. Niacin 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. Niacin is sometimes used to treat coronary artery disease (also called atherosclerosis).

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  • B-3-50, B3-500-Gr, Niacin SR, Niacor, Niaspan ER, Slo-Niacin
  • Severity: Major
    You should check with your doctor immediately if any of these side effects occur when taking niacin:

    Less common:
    Darkening of urine
    light gray-colored stools
    loss of appetite
    severe stomach pain
    yellow eyes or skin
    Severity: Minor
    Some of the side effects that can occur with niacin may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

    Less common:
    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
    runny nose
    stuffy nose
    Incidence not known:
    Dizziness or faintness
    dryness of the skin
    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
  • (oral tablet, oral tablet, extended release, oral capsule, extended release, oral liquid, compounding powder, oral capsule)