Mirena (generic: levonorgestrel) is a prescription medication that is a hormone-releasing system placed in your uterus (intrauterine device or IUD) to prevent pregnancy for up to 5 years. Mirena belongs to a group of drugs called progestins which change the lining of the uterus, alter cervical mucus, and make it difficult for sperm to enter the uterus.

This medication comes in the form of a plastic device that is inserted by a healthcare provider into the uterus.

Common side effects of Mirena include irregular menstrual periods, back pain, headache, and nausea.