The main function of this drug is to make the cervical mucus sticky, which is not conducive to the passage of sperm, to change the normal environment of the endometrium, which is not conducive to the fertilization of the egg, and to inhibit ovulation, so that no pregnancy can occur without ovulation, and the side effects are relatively small, and the success rate of contraception can reach more than 99%. If you do not want to have children, you can use this drug for a long time. This drug also has the effect of regulating menstruation and protecting the uterus and ovaries, but it should not be missed in the process of taking this drug, because if it is missed, the contraception will fail.