Read the side effects of Niacin as described in the medical literature. In case of any doubt consult your doctor or pharmacist.
Most Common -
Flushing, diarrhea, nausea, vomiting, increased cough and itching.
Gastrointestinal -
Diarrhea, nausea, vomiting and increased cough.
Skin -
Rash.
Heart -
Flushing.
Other Precautions : * Avoid excess dosage.