What are the side effects of echinacea?

What are the possible side effects of echinacea ()? Although uncommon, allergic reactions to echinacea have been reported. Stop taking echinacea 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.Other less serious side effects have also been infrequently reported. Talk to your doctor or pharmacist if you experience
  • a fever, or
  • nausea or vomiting.
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome. You may report side effects to FDA at 1-800-FDA-1088.