What are the side effects of cat's claw?

What are the possible side effects of cat's claw ()? Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.Less serious side effects may include:
  • dizziness;
  • headaches; or
  • vomiting.
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.