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Leeds, Grenville & Lanark District Health Unit
Leeds, Grenville & Lanark District Health Unit

Sexual Health - STD / AIDS - Birth Control Options
- IUS (Intrauterine System - Mirena*)

IUS (Intrauterine System - Mirena*)

What is it?

An IUS (Mirena*) is a small, plastic, T-shaped device that contains the hormone levonorgestrel. This device is placed inside a woman's uterus to prevent pregnancy. It can be left in place for up to 5 years.




How does it work?


The hormone in the IUS is released slowly over time and acts on the lining of the uterus, thereby preventing pregnancy in three ways:

  • Thickens cervical mucous making it difficult for sperm to get through

  • Causes changes in the lining of the uterus that helps to prevent implantation

  • In some women, it prevents the ovaries from releasing an egg

  • More detailed information on Mirena




How effective is it in preventing pregnancy?

  • The IUS is more than 99% effective in preventing pregnancy.




What are the advantages?

  • Very effective and long-acting (can be left in place up to 5 years)

  • Does not contain estrogen

  • Does not interfere with intercourse

  • Decreases menstrual bleeding and cramping

  • May reduce pain caused by endometriosis

  • May lower the risk of precancerous cells developing in the uterus

  • 20-30% of women will stop having periods

  • Fast return of fertility once the IUS has been removed




What are the disadvantages?

  • Must be inserted and removed by a trained health care professional

  • Possible side effects include irregular bleeding or spotting in the first months after insertion

  • Perforation of the uterus may occur at the time of insertion (rare)

  • May fall out in up to 6% of women

  • Does not protect against sexually transmitted infections



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