Flushing (warmth, redness, itching, and/or tingling of the skin) is a common side effect of niacin therapy that may subside after several weeks of consistent NIASPAN use. Additional symptoms may include rapid or pronounced heartbeat, shortness of breath, sweating, chills, dizziness, fainting, and/or swelling. Flushing may vary in severity and is more likely to occur with initiation of therapy, or during dose increases. By dosing at bedtime, flushing will most likely occur during sleep. However, if awakened by flushing at night, you should get up slowly, especially if feeling dizzy, feeling faint, or taking blood pressure medications.