What Is The Hormone-Releasing IUD? The only hormone-releasing intrauterine device (IUD) available in Australia is called Mirena®. It is a small plastic device in the shape of a 'T' with a hormone called levonorgestrel in its stem. It is placed inside the uterus (womb) to prevent pregnancy. The IUD has a fine nylon string attached … Continue reading Hormone-releasing IUD (Mirena)