Get it, forget it

Intrauterine System (IUS)

This is a small T-shaped plastic device, which slowly releases the hormone progestogen to control fertility and can last for up to 3 or 5 years depending on the brand used. It is inserted into the womb (uterus) by a specially trained doctor or nurse.  The IUS works by stopping the sperm and egg from surviving in the womb or fallopian tubes. It may also prevent a fertilised egg from implanting in the womb.



The IUS is a long-acting reversible contraceptive (LARC) method. This means that once it's in place, you don't have to think about it each day or each time you have sex. It doesn't’t interrupt sex and it works straight away after being fitted.

  • It is over 99% effective, one of the most effective contraceptive methods available.
  • Two brands of IUS are used in the UK – Mirena and Jaydess
  • You can use an IUS whether or not you've had children.
  • The IUS can make your periods lighter, shorter or stop altogether, so it may help women who have heavy periods or painful periods.
  • It can be used by women who can't use combined contraception (such as the combined pill) – for example, those who have migraines.
  • It can be used safely if you're breastfeeding. 
  • It's not affected by other medicines.
  • Your fertility will return to normal when the IUS is removed.

The IUS does not protect against sexually transmitted infections (STIs). By using condoms as well as the IUD, you'll help to protect yourself against STIs.

Find out more on the NHS choice website: