Niacin ====== þ Niacin Toxicity - The typical picture is one of flushing, pruritis, wheezing, vasodilation, and headache. Rosenbloom and Kazzi: "Toxicity, Vitamin" in Plantz and Adler's EMedicine, www.emedicine.com/emerg/topic638.htm - Niacin is taken for hypercholesterolemia. Taking aspirin 30 minutes prior to niacin reduces the flushing response. Rosenbloom and Kazzi: "Toxicity, Vitamin" in Plantz and Adler's EMedicine, www.emedicine.com/emerg/topic638.htm