Microsoft word - intrauterine contraceptive devices.docx
There are two types of intrauterine device (IUD) used in Well Woman Centres for long term
contraception.– a device containing progesterone called Mirena, and a device containing
Both are small T – shaped devices that must be inserted into your womb by a trained doctor.
Once in place, the IUD is effective for 5 years in the case of Mirena, and 10 years in the case
It thickens the mucus in your cervix so it helps to stop sperm reaching an egg.
In some women it stops the ovaries releasing an egg (ovulation), but most women who
It makes the lining of the womb thinner so implantation cannot happen.
The Mirena is very safe – less than 1 in 100 women will get pregnant during the time the coil
After you have used the Mirena for about 3 months your periods usually become lighter
and shorter, so the Mirena can be useful if you normally have heavy painful periods.
The Mirena usually reduces or eliminates period pain.
What are the disadvantages of the Mirena?
Most women have slight bleeding between periods for the first 3 months or so.
Temporary side effects such as headaches, acne and breast tenderness are possible.
These usually settle down within a few weeks.
Infection may be introduced into your womb when the coil is being put in.
The womb can push the Mirena out. This is rare but if it does occur it is most likely to
happen within a few weeks of it being put in.
The Mirena may go through the wall of the womb as it is being inserted. This is very
unlikely when the Mirena is fitted by an experienced doctor.
It thickens the mucus in your cervix so it provides a barrier to sperm moving.
It sets up a reaction in the lining of your womb so that an egg is less likely to implant.
The copper coil is slightly less effective than Mirena. However, the failure rate is still lower
than when using contraceptive pills because pills may be forgotten or not absorbed due to a
What are the advantages of the copper coil?
What are the disadvantages of the copper coil?
It can make your periods heavier than normal.
Infection may be introduced into your womb at the time the coil is being put in.
The womb can push the coil out. This is rare but if it does occur it is most likely to
happen within a few weeks of being put in.
The coil may go through the wall of the womb as it is being inserted. This is very
unlikely when the coil is fitted by an experienced doctor.
This Section Applies To Both Mirena And The Copper Coil.
Whether you have a Mirena or a copper coil fitted, the device must be put in by a specially
trained doctor. The device is fitted sometime during the first 5 days of your cycle. This is
because this is the time when the neck of your womb (cervix) is softest and so the device is
easiest to fit. You may also be asked to insert 2 tablets (containing a hormone called
misoprostol) into your vagina 3 hours before the device is fitted because these will also help
soften your cervix. Fitting an IUD can be uncomfortable so it is a good idea to take a
painkiller beforehand. You may get a period – type pain for a few days afterwards. Talk to the
doctor about taking pain relief to help with this.
During insertion, the threads of the coil are normally cut so that about an inch of thread is
After it’s fitted do I have to do anything?
You should come back for a check-up about 6 weeks after the IUD is fitted when we can
check that the threads are still visible, which means that the device is in place. After the six
weeks check, if everything is normal then you should plan to have a check up once a year. If
you get any unusual bleeding in the meantime, please make an appointment to see a one of
our doctors. In some women who have the Mirena fitted, periods may stop completely. This is
A trained doctor can take out the IUD at any time. If you are planning to have the IUD taken
out, you should ether abstain from sex or use a condom for the week before the coil is taken
out. This is because sperm can live for several days and there is a possibility of you getting
pregnant if the coil is taken out within a few days of sexual intercourse.
What if I get pregnant while using an IUD?
It is not common with the copper coil and rare with the Mirena. If you get pregnant and the
coil threads are easily seen, then the doctor will remove the device. However if the threads are
not visible, then it is better just to leave the IUD in place. There is no increased risk that it will
cause a baby to have any problems after delivery.
Will I be able to get pregnant when the IUD is removed?
Neither device has an effect on your ovarian function so you would return to normal fertility
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