The generic name for the Mannix Ring is Levonorgestrel IUD System and is usually valid for about five years. After the expiration of the levonorgestrel IUD system, patients may experience irregular periods and increased menstrual flow. Levonorgestrel IUDs are progestin-containing birth control devices. It has a contraceptive effect and reduces menstrual flow. If the levonorgestrel IUD system expires, the above effects are reduced and the patient may experience symptoms such as irregular menstruation and increased menstrual flow. In addition, the contraceptive effect will be reduced or even disappear, and the patient’s chances of becoming pregnant will increase. The levonorgestrel intrauterine device should be removed promptly after its expiration to avoid causing endometrial disease. The use of levonorgestrel intrauterine device system should be careful to exclude endometrial cancer and other malignant diseases, pregnant women and patients with progesterone-dependent tumors should be prohibited from using levonorgestrel intrauterine device system. In addition, levonorgestrel IUDs may cause adverse reactions such as headaches, and the use and removal of levonorgestrel IUDs should be evaluated by a medical professional.