The generic name for Mannitol is Levonorgestrel IUD System. A posterior uterus can be placed on the Levonorgestrel IUD system, but it may be relatively difficult to maneuver. When placing the Levonorgestrel IUD, the doctor will conduct a gynecological examination to determine the position of the uterus. It may be relatively difficult to manipulate the posterior uterus when applying the IUD, but the doctor can reset the uterus before applying the IUD, so the posterior uterus can be placed on the Levonorgestrel IUD. The levonorgestrel IUD is a slow-release system that contains progestin, which is released slowly after placement to provide contraception. At the same time, the levonorgestrel IUD can relieve some of the symptoms of heavy menstrual periods. In general, women need to rest properly after the levonorgestrel IUD, not too tired or strenuous activities, pay attention to hygiene to prevent infection, and observe whether there is lumbago, bleeding and other conditions. If the symptoms are more serious, you need to go to the hospital in time for treatment.