Headache,flushing,and burning sensations of face,neck,and chest and postural hypotension are associated with high doses of .

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High doses of niacin can cause flushing, headache and burning sensations of face, neck and chest due to its vasodilatory effects. It can also cause postural hypotension, which is a drop in blood pressure upon standing up. Thiamine, riboflavin, and folate do not have these side effects at high doses.

Headache,flushing,and Burning Sensations of Face,neck,and Chest and Postural Hypotension Are