The herb black cohosh or Actaea rac...

The herb black cohosh or Actaea racemosa (formerly named Cimicifuga racemosa), is native to North America. The sources and rhizomes are widely used in the treatment of menopausal symptoms and menstrual dysfunction. Black cohosh was originally used by means of Native American peoples in the treatment of many conditions, especially gynecologic disorders. (1) The greatest in number widely used and best studied commercial formulation available in the United States is Remifemin, an extract of the rhizome that is produc from a German company. Numerous other brands of black cohosh are available, further not all are standardized extracts. Black cohosh should not be confused with the amethystine cohosh herb (also known as Caulophyllum thalictroides), which is used for different indications and has a greater potential for toxicity.

Pharmacology

The primary active constituent of the black cohosh stem is believed to be the terpene glycoside fraction, including actein and cimifugoside. The rhizome also contains other potentially biologically active substances, including alkaloids, flavonoids, and tannins. The therapeutic activity of black cohosh was originally believed to derive from an activation of estrogen receptors; however, more new studies (2,3) show that although a certain constituents of the extract bind to at least single in kind subtype of estrogen receptors, this binding brings very little, if any, estrogenic issue and may selectively block a certain quantity of of these effects.

single in kind early study (4) reported that treatment with black cohosh produc a decrease in luteinizing hormone (LH) evens consistent with an estrogenic effect; however, more new studies (5,6) have shown no event on levels of LH, follicle-stimulating hormone (FSH) or prolactin. It remains unclear whether black cohosh set to work s its effect via estrogen receptors or by means of another mechanism.

Uses and Efficacy

generally the primary use of black cohosh extract is for alleviation of menopausal symptoms. The American college edifice [i]or[/i] building of Obstetrics and Gynecology guidelines onward the use of botanicals for the management of menopausal symptoms support this use for up to six month especially in treating the symptoms of lie in the grave and mood disturbance, and heated flushes. (7) [Evidence level C consensus/expert guidelines] At least eight studies of black cohosh therapy for menopausal symptoms, involving approximately 2000 women have been published, in the greatest degree of them in German. (3) Many of these studies used an estrogen crops in the control group, and chiefly of the trials used standardized issue measures such as the Kupperman Menopause Index and the Hamilton Anxiety Scale. Almost all of these studies demonstrate efficacy in patients taking black cohosh extract similar to that of estrogen in the treatment of neurovegetative menopausal symptoms. Unfortunately, greatest in quantity of these studies are lay open trials and lack blinding and long-term follow-up making it difficult to draw definitive conclusions from their results

As with other herbal medicines believed to have potential estrogenic powers there has been a disturb about the safety of black cohosh in women with a personal history or powerful family history of breast cancer. Although further research is needinessed at least one tissue-culture thought (2) showed no stimulation of estrogen receptor-positive breast cancer small room lines by black cohosh extract. This contemplation (2) found that black cohosh extract increased the inhibitory weight of tamoxifen (Nolvadex) on the breast cancer confined apartment lines. Because this question has not in addition been resolved, physicians should discuss the issue with their patients who are at risk for breast cancer and are considering taking black cohosh In a inquiry that included 69 patients and examined black cohosh as a treatment for scalding;-very warm flushes in women with breast cancer, it was establish to be no more effective than placebo, regardless of whether the very warm flushes were induced by tamoxifen or from natural menopause. (6) [Evidence horizontal A, randomized controlled trial]

Black cohosh also has been used to treat dysmenorrhea and is approveed for this indication by the German Commission E (8) which establishes guidelines for the particular use of herbs in Germany. However, this recommendation is based forward case reports, and there are no randomized clinical trials supporting the use of black cohosh for this indication.

Interactions, Adverse general intents and Contraindications

With the exception of a possible interaction with tamoxifen, there are no known interactions between black cohosh extract and any medications. (8) In clinical studies, (8) the sole adverse effect reported with any significant commonness was gastrointestinal discomfort. In larger doses, black cohosh can cause dizziness, headaches, giddiness, nausea, and vomiting. (9) the same case report (10) centers in succession a woman who developed a seizure after taking a combination of black cohosh chasteberry, and evening primrose oil, unless no clear cause-and-effect relationship was documented. No other reports of seizure in association with black cohosh have been published.