The IUS or ‘Mirena’ coil is over 99% effective. Less than 1 in 100 women will get pregnant over 5 years.
How does it work?
The IUS is similar to the IUD except it is impregnated with the hormone progestogen which slowly releases into the body. It is inserted into the uterus and then works by thinning the lining of the uterus to stop fertilised eggs from implanting, thickens cervical mucus to prevent sperm from reaching an egg and may prevent eggs being released through ovulation.
It remains effective for 3-5 years depending on which type you have but it can be removed sooner by a doctor or nurse.
The IUS is fitted by a nurse or doctor often with a local anaesthetic. It can be uncomfortable or hurt to have the IUS fitted but once it’s been inserted it doesn’t need removing for 3-5 years, depending on which type you have. It can be removed earlier than this but only by a nurse or doctor. Two little threads hang down through the opening (cervix) of the uterus which, when gently pulled by a professional, will remove the IUD.
How will it affect me?
Periods may become much lighter, less painful and may not last as long. They may even stop altogether. Once it’s removed, your fertility will return to normal.