The most important thing is to play the role of contraception, but also can be used to regulate the female menstrual cycle. The effects of Eusebio mainly include the following: 1. inhibit the normal ovulation function of ovaries, so that the ovaries cannot ovulate normally, thus achieving the purpose of contraception. 2. change the nature of the mucus in the cervical area, so that sperm can not easily penetrate into the uterine cavity, thus not easy to get pregnant. 3. can change the nature of the endometrium, which is not conducive to the fertilization of eggs, thus playing the role of contraception. 4. through the action of estrogen and progesterone in the drug, the formation of cyclic endometrial hyperplasia and shedding, can make the abnormal menstrual cycle back to normal. The effect of estrogen and progesterone in the drug can form cyclic endometrial proliferation and shedding, which can restore the abnormal menstrual cycle to normal. During the period of taking Eusyn, whether for contraception or for menstrual cycle regulation, it should be taken in strict accordance with the instructions or doctor’s prescription.