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来自发展中国家计划生育的大部分资料表明,长效避孕药受欢迎的趋势日益增长。从而需要开发高效、低毒、每月一次的避孕药。以每月注射一针低剂量的合成激素来抑制排卵
Much of the information from family planning in developing countries shows that the prevalence of long-acting contraceptives is on the rise. There is a need to develop efficient, low-toxic, monthly contraceptives. To inject a low dose of synthetic hormone a month to inhibit ovulation