What are side effects of niacin?

Flushing (prostaglandin mediated) (in the face and upper trunk) affects compliance (ceases in most patients after 1 to 2 weeks of a stable dose ) Dyspepsia Diarrhea Increased uric acid levels (by inhibiting tubular secretion of uric acid) Hepato toxicity have also been reported. The drug should be avoided in hepatic disease.