The Mannuelle contraceptive ring refers to the levonorgestrel intrauterine system, which is generally effective during the period in which the ring is in place. The levonorgestrel IUD is used for contraception and also for idiopathic menorrhagia. It contains 52mg/each of levonorgestrel, and the effect of placing it in the uterine cavity lasts for 5 years, after which the drug is released, but it still has a contraceptive effect. Adverse effects: changes in menstrual patterns are common; shedding, perforation, ectopic pregnancy, and obesity can occur in some populations; neurologic symptoms such as headache and dizziness can be caused in a few populations. Contraindications: contraindicated in those who are allergic to any of the ingredients; contraindicated in those who are pregnant or suspected to be pregnant; contraindicated in those with unexplained abnormal uterine bleeding; contraindicated in those with abnormal development of the cervix and uterus; contraindicated in patients with cervicitis and pelvic inflammatory disease. During the use of levonorgestrel intrauterine sterilization system, pay attention to the body’s adverse reactions, the emergence of adverse reactions promptly seek medical attention.