习惯性流产在育龄妇女中并不少见,而且发生的时间多在怀孕后12周以内,妇产科医生一般都是根据有流产史的孕妇过去发生流产的时间、提前使用保胎药来进行预防,多数能获得防止习惯性流产的预期效果。如果在孕期内使用天然的或人工合成的孕激素,能达到使子宫平滑肌弛缓的作用,并能降低子宫对垂体后叶素与催产素的敏感性,较大剂量的孕激素能抑制子宫平滑肌的活动,让子宫相对处于一种平稳的状态,从而达到安胎的目 Habitual abortion in women of childbearing age is not uncommon, but more time in more than 12 weeks after pregnancy, obstetricians and gynecologists are generally based on the history of abortion in the past, abortion occurred in the past, early use of tocolytic drugs to prevent , Most can get the expected effect of preventing habitual abortion. If the use of natural or synthetic progestin during pregnancy, to achieve the role of the uterine smooth muscle relaxation, and can reduce uterine pituitrin and oxytocin sensitivity, larger doses of progesterone can inhibit uterine smooth muscle Activities, so that the uterus is relatively stable state, so as to achieve the purpose of tocolysis