Mannitol generic name Levonorgestrel IUD system is generally recommended to be placed within the 3rd to 7th day of the start of menstruation. Levonorgestrel IUD is T-shaped with a slow-release progesterone system, which can be used for contraception, treatment of atypical endometrial hyperplasia, adenomyosis, and prevention of uterine polyps. It is generally recommended to be placed on the 3rd to 7th day of menstruation, and it should be placed after postpartum with complete uterine regrowth, at the earliest not earlier than 6 weeks postpartum, and it may be placed at a later stage, up to 12 weeks postpartum, for those who have poor uterine regrowth. Levonorgestrel intrauterine device is prohibited in cases of acute liver disease, liver tumors, pregnancy, etc. In the early stage of placement of levonorgestrel intrauterine device, there may be an increase or decrease in menstruation, spotting, scanty menstruation or even amenorrhea, headache, lower abdominal pain, etc. If you feel uncomfortable after placing the device, you should consult with a gynecologist in a timely manner.