It is a very stable levonorgestrel extended-release system, which can effectively reduce dysmenorrhea, stubborn gonorrhea, endometriosis, etc., while the contraceptive effect is very good, which is a very remarkable and even magical tool in the treatment of these diseases. But at the same time, it also has some defects: 1. more expensive. 2. It is valid for 5 years. 3.Some patients will have continuous vaginal bleeding for 6 months or even 1 year after placement (of course, foreigners think it does not affect sex life), which affects the quality of life. 4. A small number of patients may even experience amenorrhea after IUD placement (of course, it will not affect endocrine basically). Therefore, the placement of Mannorrhea is a very good measure when there is dysmenorrhea, adenomyosis with the hope of preserving the uterus and more serious gonorrhea or excessive menstruation. However, if it is used only for contraception, I personally do not think it is cost effective and it is at the discretion of the patient himself.