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Last reviewed on RxList: 10/27/2008
Niacor Side Effects Center

Last reviewed on RxList 1/22/2016

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. 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).

The usual adult dosage of Niacor is 1 to 2 grams two or three times a day. 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 should be used only when prescribed during pregnancy. This medication passes into breast milk. Consult your doctor before breastfeeding.

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.

Niacor Consumer Information

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

Call your doctor at once if you have any of these serious side effects:

  • feeling like you might pass out;
  • fast, pounding, or uneven heart beats;
  • feeling short of breath;
  • swelling;
  • jaundice (yellowing of your skin or eyes); or
  • muscle pain, tenderness, or weakness with fever or flu symptoms and dark colored urine.

If you are diabetic, tell your doctor about any changes in your blood sugar levels.

Less serious side effects of niacin include:

  • mild dizziness;
  • warmth, redness, or tingly feeling under your skin;
  • itching, dry skin;
  • sweating or chills;
  • nausea, diarrhea, belching, gas;
  • muscle pain, leg cramps; or
  • sleep problems (insomnia).

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)

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)

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© 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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