If you are currently being treated with any of the following medications, you should not use cat's claw without first talking to your health care provider.

Immunosuppressive medications -- In theory, because cat's claw may stimulate the immune system, it should not be used with medications intended to suppress the immune system, such as cyclosporin or other medications prescribed following an organ transplant or to treat an autoimmune disease.

NSAIDs -- Cat's claw may protect against gastrointestinal damage associated with nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen (Advil, Motrin) and naproxen (Aleve).

Other medications -- Cat's claw may interact with the following medications:

• Anticoagulants (blood-thinning medication)
• Diuretics (water pills)
• Estrogens or progestins, including birth control pills
• Antihypertensive (blood pressure) medication