Hormonal IUD (Intrauterine Device) is a T shaped plastic device that is implanted in the uterus by a doctor as a long term contraception. Hormonal IUD contains the hormone progestin which gets released in small amount which thickens the mucus in the cervix making it difficult for the sperm to reach the egg and prevent fertilization of the egg. It also thins the lining of the uterus.
Hormonal IUDs have different expiry dates and can last for about 3-7 year based on the brand. It is best to discuss it with your doctor.