Critical Seriousness - Trouble Breathing - Dyspnea is a Life Threatening Side Effect of both Niaspan Extended-Release and Niacin. Critical Seriousness - Abnormal Liver Function Tests - Abnormal Hepatic Function Tests is a Life Threatening Side Effect of both Niaspan Extended-Release and Niacin. Critical Seriousness - Life Threatening Allergic Reaction - Anaphylaxis is a Life Threatening Side Effect of both Niaspan Extended-Release and Niacin. Critical Seriousness - Muscle Disease - Myopathy is a Life Threatening Side Effect of both Niaspan Extended-Release and Niacin. Critical Seriousness - A Spasm of the Larynx - Laryngismus is a Life Threatening Side Effect of both Niaspan Extended-Release and Niacin. Critical Seriousness - Giant Hives - Angioedema is a Life Threatening Side Effect of both Niaspan Extended-Release and Niacin. Critical Seriousness - Numbness and Tingling - Paresthesia is a Life Threatening Side Effect of both Niaspan Extended-Release and Niacin. Critical Seriousness - Yellowing of Skin or Eyes from Liver Problems - Jaundice is a Life Threatening Side Effect of both Niaspan Extended-Release and Niacin. Critical Seriousness - Hives - Urticaria is a Life Threatening Side Effect of both Niaspan Extended-Release and Niacin. Critical Seriousness - Hepatitis caused by Drugs - Drug-Induced Hepatitis is a Life Threatening Side Effect of both Niaspan Extended-Release and Niacin. Critical Seriousness - Visible Water Retention - Edema is a Life Threatening Side Effect of both Niaspan Extended-Release and Niacin. Critical Seriousness - Blockage of Normal Bile Flow - Cholestasis is a Life Threatening Side Effect of both Niaspan Extended-Release and Niacin. |