Hormonal coil (IUS)

Mirena coil

What the packet says

What is Mirena coil?

Hormonal ingredients

What's it made of?

The Mirena coil is a small white T-shaped frame made from a plastic called polyethylene. The hormone is contained within a silicone substance called polydimethylsiloxane, which is surrounded by a membrane (skin) also made of polydimethylsiloxane. The T-shaped frame also contains barium sulphate so that it can be seen on X-rays. There are two fine brown threads, made of iron oxide and polyethylene, attached to the bottom of the frame which are used to remove the coil.

How Mirena coil works

The hormonal coil is a small, T-shaped plastic device that is inserted into your womb by a doctor or nurse. It releases the hormone progestogen gradually into your womb which prevents pregnancy by making the fluid in your cervix thicker (which makes it more difficult for sperm to enter the womb), and preventing the lining of your womb thickening enough for an embryo to grow in it. Sometimes it can also stop you ovulating.

Mirena coil side effects

  • Womb Cramps
  • Vaginal Discharge
  • Tender Breasts
  • Spots or acne
  • Headaches

Frequency

  • During intercourse
  • Daily
  • Monthly
  • 1 - 3 Months
  • 1 - 3 Years
  • 3 - 5 Years
  • Permanent
  • Similar to

    Typical effectiveness

    99.8

    %

    Contains hormones

    Yes

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    Reviews

    5/5
    16/05/2021
    Hormonal coil (IUS)

     –

    Mirena
    The IUS is the best form of contraception I’ve tried. I have recommended it to 6 friends who have had one inserted too...
    4/5
    15/05/2021
    Hormonal coil (IUS)

     –

    Mirena
    Approaching the end of my coil, it was mostly good but I had a huge drop in libido in the last year, I also experienced ...
    5/5
    14/05/2021
    Hormonal coil (IUS)

     –

    Mirena
    I have just had my Mirena coil fitted and I wanted to write a review to dispel what others have said. I did not feel a t...
    4/5
    13/05/2021
    Hormonal coil (IUS)

     –

    Mirena
    Ask the doctor to cut the strings as short as they can – mine were left long and would hurt my partner during sex....
    4/5
    04/05/2021
    Hormonal coil (IUS)

     –

    Mirena
    I had the more a fitted 2 months after having my 2nd child, with the thoughts that we our current circumstances dictated...
    1/5
    26/04/2021
    Hormonal coil (IUS)

     –

    Mirena
    It was my biggest mistake. I was permanently bloated, gained weight, had terrible skin, moods were erratic and my skin w...

    What you said

    Side effects

    Show more

    After effects

    Show more

    Moods

    Periods

    Body weight

    Sex drive

    Reviewer data

    Time taken

    Age of Reviewers

    Reviewers had children

    Reviewers currently using

    Detailed information

    How to get started with the Mirena coil

    Women ask us lots of questions about getting an IUS / hormonal coil fitted – so we’ve put together a guide on everything you ever wanted to know about the coil. Below are a few key points to consider:

    • To get a contraceptive coil fitted you need to go to a GP surgery or sexual health clinic where some staff are trained to fit them. You can contact your GP and ask if they fit coils, or search for clinics that fit coils here.
    • The Mirena coil can be fitted at any time during your monthly period cycle, as long as you’re not pregnant (although you may prefer to get it fitted when you’re not on your period).
    • Your doctor or nurse will do some tests to make sure that you can have the coil – like making sure that you’re not pregnant and checking for infections or STIs.
    • Your doctor or nurse will use a speculum (like when you have a smear test) to open up your vagina and then insert the coil through the cervix into the womb. Most women find this uncomfortable.
    • If it’s fitted in the first seven days of your cycle, you’ll be protected against pregnancy straight away. If it’s fitted at any other time, you’ll need to use condoms or other contraception, for seven days afterwards.
    • You will normally go back for a check up 3-6 weeks after getting it fitted.

    How to stop the Mirena coil

    • Mirena coil removal can happen at any time by a trained doctor or nurse. It’s simpler than having it fitted – they will gently pull on the threads and the T shape folds up and it can be pulled out of the womb.
    • If you’re not having another coil put in and don’t want to get pregnant, you’ll need to make sure you don’t have sex seven days before you have it removed, or use condoms or another method.
    • Check out our survey results to read Mirena coil reviews and see how long it took most women’s cycles to return to their definition of ‘normal’ and read up about other after effects they’ve experienced.

    Things that can go wrong

    • There’s a small risk of infection after the Mirena coil been fitted. This may occur when harmless bacteria normally found in vagina are pushed inside the womb. You’ll know it’s infected if you have unusual discharge, there’s a strong smell, or you develop a high temperature or chills.
    • Around 1 in 20 contraceptive coils can fall out or be pushed out by the womb, this is most common in the first few weeks of getting it fitted, or during a period. If this happens, head to your doctor or nurse to get a check up.
    • If the coil doesn’t work and you get pregnant, there’s also a small increased risk of ectopic pregnancy – when the egg implants outside the womb, normally the fallopian tubes. However, the overall risk of ectopic pregnancy is less in women using a coil than in women using no contraception at all.
    • Very occasionally the threads get lost. This happens to about 1 in 100 women, and is more commonly caused by the threads being pulled up inside into the cervix. They may notice this when you go to have the coil removed, and sometimes the threads can reappear naturally.
    • Even more occasionally (1 in 1000 chance) the coil goes through the wall of the womb into the abdomen. This is called ‘perforation’ and it this happens, they can remove the coil via surgery.

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    Thanks for telling us you're interested in talking to other Lowdown users. If you have any other ideas for ways we can improve the site, please email info@theldown.com

    If you'd like to report a review for not adhering to our Review guidelines, please email info@theldown.com with a link to it and we'll take look!

    Thanks for telling us you're interested in talking to other Lowdown users. If you have any other ideas for ways we can improve the site, please email info@theldown.com

    If you'd like to report a review for not adhering to our Review guidelines, please email info@theldown.com with a link to it and we'll take look!

    Thanks for telling us you're interested in talking to other Lowdown users. If you have any other ideas for ways we can improve the site, please email info@theldown.com

    If you'd like to report a review for not adhering to our Review guidelines, please email info@theldown.com with a link to it and we'll take look!

    Thanks for telling us you're interested in talking to other Lowdown users. If you have any other ideas for ways we can improve the site, please email info@theldown.com

    If you'd like to report a review for not adhering to our Review guidelines, please email info@theldown.com with a link to it and we'll take look!