Norelide is administered within 1-2 weeks after the injection and there are variations in the exact time of menstruation. Norelide is a gonadotropin drug, the main active ingredient of which is goserelin acetate. It is mainly used in the treatment of breast cancer as well as endometriosis to relieve the level of endometriosis pain and reduce the extent of endometrial damage. While treating the disease, Norelide will inhibit the proliferation of the endometrium leading to delayed menstruation. In perimenopausal women using Norelide will experience complete menopause and use Norelide in conjunction with estrogen and progestin to avoid causing osteoporosis. Due to the sensitivity of each patient to Norelide, the number of injections, as well as physical differences, disease effects and other factors are different, the use of Norelide later menstruation time varies greatly, it is recommended to do ultrasound to monitor the thickness of the endometrium, if necessary to promote menstruation.