An IUS is a small plastic device that is put into your uterus (womb) and releases a progestogen hormone. This is similar to the natural progesterone produced by the ovaries. The IUS works as contraception for three, four or five years depending on the type. There are different types and sizes with different amounts of the progestogen hormone. If you are aged over 45 when a particular type of IUS (Mirena) is fitted, it will work as contraception until after the menopause when contraception is no longer needed.
Effectiveness: Over 99% effective at preventing pregnancy – one of the most effective methods there is.
Fit and forget: Once you have got one, you do not need to remember to take or use contraception. The IUS can work for 3, 4 or 5 years depending which type you get.
Periods: May be lighter, shorter, or less painful. May stop or become irregular.
STI protection: No.
Hormones: Releases the hormone progestogen.
Please download the leaflet for further information.