催产素为最常用且安全有效的引产药物，可单独使用亦可与各种引产方法联合使用。该药具有缩短产程，减少难产，减少出血，降低围产母婴死亡等优点。催产素的作用主要是加强子宫平滑肌的收缩。妊娠中晚期的子宫对催产素较敏感，恰当地应用催产素与中晚期妊娠引产成功密切相关。 Oxytocin is the most commonly used and safe and effective induction drug, either alone or in combination with various abortion methods. The drug has shortened labor, reduce dystocia, reduce bleeding, reduce perinatal mother and child death and so on. The role of oxytocin is to strengthen the contraction of the uterine smooth muscle. Late pregnancy uterus is more sensitive to oxytocin, the proper application of oxytocin and induction of labor in late pregnancy is closely related to success.