What are the side effects of blue cohosh?

What are the possible side effects of blue cohosh ()? Although rare, allergic reactions to blue cohosh may occur. Stop taking blue cohosh and seek emergency medical attention if you experience symptoms of a serious allergic reaction including difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives.Irritation of the skin and mucous membranes has been reported following contact with blue cohosh powder.This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.