From Jennifer Moll,
Your Guide to Cholesterol.
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About.com Health's Disease and Condition content is reviewed by Rich Fogoros, MD

There are many side effects associated with niacin that vary in degree from each individual. These side effects seem to correlate with dosage strength and may be reduced if you are taking a time-released form of niacin. Symptoms typically disappear over a week or so, as your body is adjusting to the medication. They include, but are not limited to:

•flushing (redness, itching, warmth, redness)

•night sweats

•palpitations, cardiac fibrillations, or other arrhythmias

•decreased glucose tolerance

•migraines

•skin hyperpigmentation