What are the side effects of barberry?

What are the possible side effects of barberry ()? Although rare, allergic reactions to barberry may occur. Stop taking barberry 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.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.