Intrauterine System (IUS)
The intrauterine system (IUS) is a small, T-shaped, soft plastic that contains small amounts of a hormone called levonorgestrel. It is called Mirena or Jaydess.
How does it work?
Releases the hormone slowly over time and acts on the lining of the uterus (womb).
- Changes the lining and mucous of the cervix which makes it difficult for the sperm to get to a woman’s egg.
- Mirena can stay in the uterus up to 5 years. Jaydess is effetive for up to 3 years.
- No daily routine required.
- Does not contain the hormone estrogen.
- Okay for breastfeeding women to use.
- Reduces menstrual cramps.
- May reduce the risk of some forms of cancer (endometrial).
- Some women may stop having menstrual periods.
- Does not interfere with sex.
- May cause irregular bleeding and spotting for the first 3-6 months.
- A very small number of women will have the IUS come out on its own.
- A monthly string check is recommended after menstrual period.
How to use an IUS
- The IUS must be put in and taken out by a trained health care professional.
Typical success rate
Sexually transmitted infection (STI) protection
The IUS does not protect against STIs. Use a condom, dental dam, or glove every time you have sex. 1 2
For more information, please contact The Clinic at 519-663-5317.
Date of creation: July 26, 2011
Last modified on: May 20, 2022
The Society of Obstetricians and Gynecologists. (2009). Choosing a contraceptive that is right for u.