Mirena is currently the only IUD that has a local hormonal effect. The levonorgestrel drug in the vertical tube of Mirena is released in a quantitative manner. The total amount of medication in the vertical tube is approximately 52 milligrams (mg), and 20 micrograms (ug) are released daily. In addition to its contraceptive effect, Mannorrhea is also useful for women with excessive menstruation and dysmenorrhea, so Mannorrhea is effective in treating patients with adenomyosis. Women who want to have children can restore their fertility by removing the IUD. The reason is that the local drug causes temporary atrophy of the endometrium and inhibits the growth of the endometrium, but does not affect the function of the ovaries, and sometimes the menstruation will occur for 2 to 3 days each time.