Black cohosh is an herbal medicine made from the root of the plant. Preparations made with dried cohosh root are sold in powders, capsules or tinctures. The most common use of this herb is to relieve unpleasant symptoms of menstruation and menopause, such as abdominal cramping, hot flashes, insomnia and mood swings. As with any medication, side effects are possible and you should discuss taking dried black cohosh with your doctor before using it.
Dizziness, Nausea and Headaches
Common side effects of black cohosh include dizziness, nausea and headaches. Taking the herb on a full stomach might help alleviate these symptoms. If you find you are dizzy, avoid standing up quickly to reduce the risk of becoming lightheaded or fainting. Dizziness could also make it dangerous for you to drive a car or operate heavy machinery. Stop taking black cohosh if these side effects make you very uncomfortable, and talk to your doctor if they continue.
Allergies
Black cohosh contains a small amount of salicylic acid, the main ingredient in aspirin. If you are allergic to aspirin, or taking aspirin for other reasons, don't use black cohosh.
Tumor Growth
Black cohosh is believed to have chemicals that mimic estrogen, but as the National Institute of Health's Office of Dietary Supplements points out, research on the herb's effectiveness as a replacement for hormone therapy is inconclusive. However, women who have certain types of breast or ovarian cancer, as well as women with fibroid tumors are advised not to use estrogen or black cohosh since it might encourage the growth of these types of tumors. Women who have a family history of breast or ovarian cancer might also want to avoid this herb.
Uterine Contractions
In some women, black cohosh causes uterine contractions. It has been used in traditional medicine in combination with other herbs to induce labor and end unwanted pregnancies. For this reason, pregnant women should not take black cohosh because there is a risk of miscarriage or premature labor.
Liver Damage
The University of Maryland Medical Center reports that a very rare side effect of black cohosh is possible liver damage. If you already have liver disease or liver problems, or if you are a heavy drinker, you should not take black cohosh. Additionally, stop taking the herb and contact your doctor immediately if you develop any symptoms like jaundice, darkening of the urine or abdominal pain.
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