An IUS is a small T-shaped plastic device that is put into your uterus (womb) and releases a progestogen hormone. This is similar to the natural progesterone that women produce in their ovaries.
There are two types of IUS – Mirena and Jaydess. As Jaydess has only recently been licensed for contraceptive use in the UK, the information on this page is currently only about the IUS Mirena.
The IUS has two threads at one end which hang through the opening at the entrance of your uterus – (cervix) into the top of your vagina.
It works for up to five years.
If you are aged 45 or older when the IUS is fitted, it can be left in until the menopause.