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激素类避孕针被认为是当今最有效的避孕方法之一,估计约有1000万以上妇女用过避孕针,约1.5万妇女正在用此种避孕方法。最常用的避孕针是醋酸甲孕酮(DMPA)和炔诺酮庚酸酯(NET—EN)。这二种避孕针尽管被广泛使用,但其防止妊娠的确切机制仍不清楚。推测其作用机制为:①中枢性抑制排卵;②影响卵巢滤泡结构;③使宫内膜不适于受精卵植入;④使宫颈粘液不利于精子穿透;⑤改变卵子在输卵管内运行速率;而迄今中枢性抑制被认为是最重要的作用机制。对于避孕药
Hormone contraceptives are considered to be one of the most effective contraceptive methods available today, with about 10 million women using it and about 15,000 using this method of contraception. The most commonly used contraceptives are medroxyprogesterone acetate (DMPA) and norethindrone acetate (NET-EN). Although these two types of condoms are widely used, the exact mechanism for preventing pregnancy remains unclear. It is speculated that its mechanism of action is as follows: (1) central ovulation inhibition; (2) affect ovarian follicular structure; (3) endometrial implantation is not suitable for fertilized eggs; (4) cervical mucus is not conducive to sperm penetration; (5) To date, central suppression is considered as the most important mechanism of action. For birth control pills