SEATTLE -- Black cohosh alone or with other botanical therapies was no better than placebo at relieving hot flashes or other vasomotor symptoms associated with menopause, found the Herbal Alternatives for Menopause (HALT) trial.
SEATTLE, Dec. 18--Black cohosh is a washout as a remedy for hot flashes and other symptoms of menopause, found investigators here.
In a study comparing black cohosh alone or with other botanical therapies with hormone therapy or placebo, there were no significant differences in vasomotor symptom frequency or intensity between women who received black cohosh or placebo, revealed the Herbal Alternatives for Menopause (HALT) trial.
In fact, women who took a combination of botanical supplements plus soy actually had significantly more severe symptoms of menopause at one year than women on placebo, reported Katherine M. Newton, Ph.D., of Group Health, a Seattle-based health system, and colleagues, in the Dec. 19 issue of the Annals of Internal Medicine.
"We were disappointed by the findings because many women want an alternative to hormone therapy, and many have assumed that black cohosh is a safe, effective choice," said Dr. Newton. "While hormone therapy is still the most effective treatment for hot flashes, recent studies have shown that it poses serious risks."
Although the news may be disappointing for women approaching or experiencing menopause, the results of the HALT trial also offer some good news about the natural history of menopausal symptoms, wrote Carol M. Mangione, M.D., M.S.P.H., of UCLA, in an accompanying editorial.
"Women in the placebo group experienced an approximately 30% reduction in the severity and frequency of vasomotor symptoms during the 12-month follow-up period," she wrote. "This finding is consistent with the observed 30% to 35% decline in vasomotor symptoms among the placebo groups in a number of the large, well-designed clinical trials."
The authors enrolled 351 peri-menopausal or post-menopausal women from the ages of 45 to 55. The participants were randomly assigned in a double-blinded fashion to one of five treatment groups:
The women were followed at three, six and 12 months for rate and intensity of vasomotor symptoms on a three-point scale, with 1=mild and 3=severe, and with the Wiklund Vasomotor Symptom subscale.
They found that there were no significant differences except one between any of the herbal interventions and placebo in either vasomotor symptoms per day, symptom intensity, or Wiklund score at any of the three time points, nor when the three time points were averaged (P
Dr. Newton suggests that women with vasomotor symptoms associated with menopause may find relief by dressing in layers, sleeping in a cooler room, keeping ice water and a fan nearby, and avoiding possible triggers such as very hot liquids or alcohol.
She noted that in this and other studies hot flashes decreased over time in all groups.
"We call this the 'tincture of time' -- that is, over time, hot flashes nearly always go away on their own," she said.
The authors acknowledged that "the trials did not simulate the whole person approach used by naturopathic physicians. Differences between treatment groups smaller than 1.5 vasomotor symptoms per day cannot be rule out," they wrote.