Uncaria tomentosa, known as cat's claw, is an herbal remedy used traditionally for relieving inflammation, stomach ulcers, dysentery, fever and symptoms of arthritis. Cat's claw may boost the immune system, dilate blood vessels and help lower blood pressure and act as a diuretic--thus helping the body eliminate excess fluid--according to the University of Maryland Medical Center (UMMC). Cat's claw may even have anti-cancer effects. Cat's claw bark appears to have few side effects; serious reactions are quite rare.
Minor Side Effects
Some individuals experience nausea, loose stools or diarrhea when taking cat's claw, as noted by the UMMC. If diarrhea occurs, it tends to be mild and resolves as the person's body becomes accustomed to the herb. Side effects of dizziness, headaches and low blood pressure--known as hypotension--also are possible.
Considerations for Women
Pregnant women and women trying to become pregnant should not consume cat's claw bark. The herb has a traditional use for preventing and terminating pregnancy, and it may cause miscarriage, according to the National Center for Complementary and Alternative Medicine. The UMMC also advises against using cat's claw while breastfeeding and recommends not giving the herb to children except under a doctor's supervision.
Immune System Stimulation
Because cat's claw bark may stimulate the immune system, people with certain health disorders should not take this herb, as explained by the UMMC. Individuals with autoimmune diseases or tuberculosis should not use cat's claw. One case of acute kidney failure has been reported in a patient with systemic lupus erythematosus who was taking cat's claw, according to the Memorial Sloan-Kettering Cancer Center (MSKCC). Additionally, people with skin grafts or who are receiving organ transplants should not use this herbal remedy, because it may result in rejection of the new skin or organ.
Parkinson's Disease Worsening
A very rare possible side effect of cat's claw bark or root involves deterioration in Parkinson's disease. One case has been reported of worsening motor symptoms when a Parkinson's patient was taking cat's claw extract, according to the MSKCC. The symptoms improved after the individual stopped taking the substance.
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