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过去十年来,对长效方法的研究多在阴道环和埋植剂等。许多新方法中甾体剂量减低而且为零级释放率,因而可把口服避孕药的脉冲效应减小至最低限度。目前的WHO研究规划将继续研制一月一次的避孕针剂,3个月一次的孕激素注射剂,左旋18-甲基炔诺酮释放阴道环及美国国立儿童健康和人类发育研究所联合研制的生物降解埋植剂(Capronor)及产后避孕的新方法。
Over the past decade, the study of long-term methods in the vaginal ring and implants and more. In many new methods, the steroid dose is reduced and the zero-order release rate is achieved, thus minimizing the pulse effect of oral contraceptives. The current WHO research program will continue the development of a once-a-month pill, a 3-month progestin injection, a levonorgestrel-18-release nostril ring and a biodegradability jointly developed by the National Institute of Child Health and Human Development Capronor and new methods of contraception after childbirth.