Do not use this product if you are subject to frequent drug testing. If you have an autoimmune disease, consult your health care provider before using cat’s claw. Cat’s claw may slow blood clotting, and this might increase the risk of bleeding during surgery. Talk to your health care provider if you take cat’s claw and you are scheduled to have surgery. If you take any type of medicine, talk with your health care provider before using cat’s claw or other herbal products; some herbs and medicines interact in harmful ways. Do not take if you are pregnant or nursing .