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Intrauterine contraceptive device (IUD)

3-minute read

An intrauterine device (IUD) is a highly effective and reliable method of contraception that lasts for 5 years or more.

What is the intrauterine device (IUD)?

IUDs are small devices that are placed inside your uterus (womb) to prevent pregnancy.

Types of IUD

There are 2 types of IUD:

  • the hormonal IUD — made of plastic and which releases a hormone
  • the copper IUD — made of copper and plastic, which does not release a hormone

The only hormone-releasing IUD available in Australia is Mirena, which slowly releases a progestogen hormone called levonorgestrel.

illustration of an intra-uterine contraceptive device (IUD)
An IUD inside the uterus

There are 2 copper IUDs available in Australia. Multiload lasts for up to 5 years and the Copper T (or TT380R) lasts for up to 10 years.

How does the IUD work?

The hormonal IUD releases progestogen which:

  • thickens the mucus at the entrance to your uterus so sperm can't get through
  • thins the lining of the uterus, making it hard for a fertilised egg to take hold

This is similiar to the way in which the mini pill and the contraceptive implant work.

The copper IUD works by:

  • making it harder for sperm to reach and fertilise an egg
  • changing the lining of the uterus so that if an egg was fertilised, it still wouldn't be able to attach and develop

Copper is toxic to sperm, so the copper IUD can also be used as an emergency contraceptive within 5 days of unprotected sex.

How well does the IUD work?

The IUD works very well if inserted and used properly, and is one of the most effective reversible methods of contraception available.

If 100 women use an IUD for a year, fewer than 1 will become pregnant.

An IUD won't protect you against sexually transmitted infections (STIs) so you will need to use condoms for added protection.

Advantages and disadvantages of the IUD

Both types of IUD offer several benefits, which include being:

  • extremely good at preventing pregnancy
  • easy to use and maintain
  • long-lasting and cost-effective
  • immediately reversible if you decide you want to get pregnant

The hormonal IUD also makes periods lighter and less painful. Sometimes they stop altogether.

The main disadvantages of IUDs include:

  • a small risk of problems after insertion, such as pelvic infection
  • they can move out of place
  • Mirena can cause side effects such as irregular bleeding and sore breasts
  • copper IUDs can initially make periods heavier and more painful

IUD removal

Although IUDs provide protection for many years, they can be removed earlier. It is a quick procedure, in which a doctor gently pulls on the string, and the IUD's arms fold up so it slips out. Some women find it uncomfortable while others don't feel very much.

More information

Family Planning NSW has detailed fact sheets on both the copper IUD and hormonal IUD.

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Last reviewed: February 2019

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