Uncaria tomentosa -- more commonly known as cat's claw -- is a type of vine found in the tropical regions of Central and South America. The root and bark of Uncaria tomentosa is purported to boost the immune system, reduce inflammation and act as a diuretic when used as a medicinal supplement; however, additional research is necessary to further validate these potential health benefits of cat's claw, the University of Maryland Medical Center warns. Talk with your medical provider about Uncaria tomentosa side effects before you begin taking this type of natural supplement.
Mild Side Effects
When taken as directed, Uncaria tomentosa typically doesn't cause noticeable side effects. In certain cases, you may experience mild stomach irritation after taking a dose of cat's claw. Diarrhea may result in urgent, loose bowel movements accompanied by abdominal bloating, cramping or discomfort. Infrequently, you may experience headache pain, dizziness of vomiting. Seek care from your physician if these side effects become severe or do not subside.
Female-Specific Side Effects
Treatment with Uncaria tomentosa during pregnancy may result in fetal damage or miscarriage. Additionally, the use of this supplement may also make it difficult for women to become pregnant, the National Center for Complementary and Alternative Medicine warns. Consequently, do not take cat's claw supplements if you are pregnant, breastfeeding or trying to become pregnant.
Drug Interactions
Before beginning treatment with Uncaria tomentosa, be sure to discuss all medications you are currently taking with your health care provider. Cat's claw may interact with certain medications including diuretics, blood-thinners, birth control pills, estrogen or progestin therapies and blood pressure drugs. Additionally, do not use Uncaria tomentosa in conjunction with immunosuppressive medications, as this supplement may actually improve immune system functioning.
Contraindications
Discuss any pre-existing health concerns you may have with your doctor before taking cat's claw. The pediatric safety and efficacy of this herbal supplement have not been evaluated. As such, children should not receive treatment with Uncaria tomentosa unless otherwise instructed by a physician. Avoid treatment with cat's claw if you have undergone a skin graft or organ transplant or if you have tuberculosis or an autoimmune disease. Using Uncaria tomentosa may enhance your immune system, which may exacerbate symptoms associated with your immune-related health condition.
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