What side effects may I notice from receiving Niacin (Vitamin B3)?

Side effects that you should report to your care team as soon as possible:
-Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat
-High blood sugar (hyperglycemia)—increased thirst or amount of urine, unusual weakness or fatigue, blurry vision
-Liver injury—right upper belly pain, loss of appetite, nausea, light-colored stool, dark yellow or brown urine, yellowing skin or eyes, unusual weakness or fatigue
Side effects that usually do not require medical attention (report to your care team if they continue or are bothersome):
-Bloating
-Burping
-Facial flushing, redness
-Gas

This list may not describe all possible side effects for Niacin (Vitamin B3). Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.