Mannitol is Levonorgestrel IUD system, whether it is good to use Levonorgestrel IUD system for heavy menstruation depends on the cause of heavy menstruation. If it is caused by adenomyosis, you can use levonorgestrel IUD system, if it is caused by other reasons of heavy menstruation, it is not recommended to use. 1. Uterine adenomyosis: Levonorgestrel IUD system will release levonorgestrel continuously in the uterine cavity, thus providing contraception. In addition, this drug can inhibit the endometrium and make it shrink to reduce menstrual flow. If you suffer from adenomyosis, you can use levonorgestrel intrauterine system to improve symptoms such as excessive menstrual cramps. 2. Other causes of excessive menstruation: excessive menstruation may be caused by other reasons, such as uterine fibroids, endometrial cancer, as well as puberty or menopause, etc. For these causes of excessive menstruation, the use of levonorgestrel IUD system does not have a significant effect, and needs to be directed at the cause of the symptoms of the treatment. Levonorgestrel intrauterine system is recommended to be used under the guidance of a doctor, after the IUD may have some uncomfortable reactions, you should communicate with your doctor in a timely manner.