New pills postpone periods

 作者:施鸫峰     |      日期:2019-03-06 03:05:16
By Sylvia Pagán Westphal Two pills that postpone menstruation in monkeys have been developed by US and German scientists. Robert Brenner of the Oregon Regional Primate Research Center says the results can be directly extrapolated to humans because the menstruation pattern of the rhesus macaques studied is identical to that of humans. Brenner expects the pills should be available to women within a few years. Conventional birth control pills, usually a mixture of progesterone and estrogen, can also block menstruation when used continuously. However, Brenner says the new pills could be an alternative for women who wish to temporarily stop their periods, but do not react well to the conventional pills. The pills may aid women with unusually painful and excessive monthly bleeding. They could also help those who suffer from endometriosis, a painful condition of the lining of the uterus, which is alleviated by stopping menstruation. “Women who have these problems should have the option to suppress menstruation,” says Sheldon Segal, author of the book ‘Is Menstruation Obsolete?’. He says the work is “very promising.” Brenner and colleagues treated monkeys for 40, 60 or 100 days with the menstrual suppressants. These work by supplying very low doses of a compounds which blocks the receptor for progesterone, one of the key hormones in a woman’s menstrual cycle. One of the compounds allowed ovulation but blocked menstruation, and the other blocked both ovulation and menstruation. All monkeys remained healthy, and their periods returned within 15 to 41 days after the treatment was stopped. While there are numerous concerns of health risks, a growing number of doctors believe it is safe to stop menstruation for several months at a time. Pills to stop a woman’s period for months – or even years – are currently being developed in the US and Canada. Journal reference: Human Reproduction (vol 16,