Niacor Side Effects Center

Last updated on RxList: 5/17/2022
Niacor Side Effects Center

What Is Niacor?

Niacor (niacin), also called nicotinic acid, is a B vitamin (vitamin B3) 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. Niacor 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). Niacor is available in generic form.

What Are Side Effects of Niacor?

Common side effects of Niacor include flushing of the face and neck (warmth, redness, or tingly feeling), headache, itching, burning, sweating, or chills within 20 minutes of taking this medication. Flushing may persist for a few hours after use. These side effects should improve or go away as your body adjusts to Niacor.

Other side effects of Niacor include:

  • dizziness,
  • stomach upset,
  • heartburn,
  • nausea,
  • vomiting,
  • diarrhea,
  • itching,
  • dry skin,
  • belching,
  • gas,
  • muscle pain,
  • leg cramps, or
  • sleep problems (insomnia)
    • Dosage for Niacor

      The usual adult dosage of Niacor is 1 to 2 grams two or three times a day.

      What Drugs, Substances, or Supplements Interact with Niacor?

      Niacor may interact with other cholesterol-lowering drugs (atorvastatin, fluvastatin, lovastatin, pravastatin, simvastatin), blood thinners, multivitamins or mineral supplements containing niacin, blood pressure or heart medications. Tell your doctor all medications and supplements you use.

      Niacor During Pregnancy or Breastfeeding

      Niacor should be used only when prescribed during pregnancy. This medication passes into breast milk. Consult your doctor before breastfeeding.

      Additional Information

      Our Niacor (niacin) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

      This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


What is cholesterol? See Answer
Niacor Consumer Information

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

  • a light-headed feeling, like you might pass out;
  • irregular heartbeats;
  • severe warmth or redness under your skin;
  • vision problems; or
  • jaundice (yellowing of the skin or eyes).

Common side effects may include:

  • flushing (sudden warmth, redness, or tingly feeling);
  • upset stomach, vomiting, diarrhea;
  • abnormal liver function tests;
  • itching, dry skin;
  • cough;
  • skin discoloration; or
  • headache.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Niacor (Niacin Tablets)


How to Lower Your Cholesterol & Save Your Heart See Slideshow
Niacor Professional Information


Cardiovascular: Atrial fibrillation and other cardiac arrhythmias, orthostasis, hypotension.

Gastrointestinal: Dyspepsia, vomiting, diarrhea, peptic ulceration, jaundice, abnormal liver function tests. Skin: Mild to severe cutaneous flushing, pruritus, hyperpigmentation, acanthosis nigricans, dry skin. Metabolic: Decreased glucose tolerance, hyperuricemia, gout.

Eye: Toxic amblyopia, cystoid macular edema.

Nervous System/Psychiatric:Headache.

Read the entire FDA prescribing information for Niacor (Niacin Tablets)

© Niacor Patient Information is supplied by Cerner Multum, Inc. and Niacor Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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