Skip to main content

IUS (intrauterine system) - known as a mirena coil / jaydess

A woman can get pregnant if a man’s sperm reaches one of her eggs (ova). Contraception tries to stop this happening by keeping the egg and sperm apart or by stopping egg production. One method of contraception is the intrauterine system (IUS) - sometimes referred to as a minera coil or jaydess.

An IUS is a small, T-shaped plastic device that is inserted into your womb (uterus) by a specially trained doctor or nurse.

The IUS releases a progestogen hormone into the womb. This thickens the mucus from your cervix, making it difficult for sperm to move through and reach an egg. It also thins the womb lining so that it's less likely to accept a fertilised egg. It may also stop ovulation (the release of an egg) in some women.

The IUS is a long-acting reversible contraceptive (LARC) method. It works for five years or three years, depending on the type, so you don't have to think about contraception every day or each time you have sex.

You can use an IUS whether or not you've had children.

We have included further information about the IUS below to help you make an informed choice about your contraception. After reading it, if you think the IUS is the right contraception choice for you please make an appointment at one of our clinics. You can either book an appointment online or by calling the team on 0151 514 6464. Please note: Clinic appointments for coils are very popular and get booked up very quickly. We can only fit coils for contraceptive purposes - if you book an appointment or attend a clinic for a coil for non contraceptive purposes we will be unable to see you. If you require a coil for non contraceptive/gynecological purposes e.g. to regulate periods, please see your GP.

About the IUS

  • it can be taken out at any time by a specially trained doctor or nurse and your fertility quickly returns to normal
  • the IUS can make your periods lighter, shorter or stop altogether, so it may help women who have heavy periods or painful periods
  • it can be used by women who can't use combined contraception (such as the combined pill) – for example, those who have migraines
  • once the IUS is in place, you don't have to think about contraception every day or each time you have sex
  • some women may experience mood swings, skin problems or breast tenderness
  • there's a small risk of getting an infection after it's inserted
  • it can be uncomfortable when the IUS is put in, although painkillers can help with this
  • the IUS can be fitted at any time during your monthly menstrual cycle, as long as you're definitely not pregnant. Ideally, it should be fitted within seven days of the start of your period, because this will protect against pregnancy straight away. You should use condoms for seven days if the IUS is fitted at any other time
  • the IUS does not protect against sexually transmitted infections (STIs). By using condoms as well as the IUS, you'll help to protect yourself against STIs

Having an IUS fitted

An IUS can be fitted at any time during your menstrual cycle, as long as you are not pregnant or have any risk of pregnancy (you have not had unprotected sex).

Once fitted, you'll be protected against pregnancy straight away.

You may get pain and bleeding for a few days after having an IUS fitted and our clinical team will explain this to you. We always advise that you contact us if you experience any of the following, as this may mean you have an infection:

  • pain in your lower abdomen
  • a smelly discharge
  • have a high temperature
  • have a smelly discharge

How to tell whether an IUS is still in place

An IUS has two thin threads that hang down a little way from your womb into the top of your vagina. The doctor or nurse who fits your IUS will teach you how to feel for these threads and check that it is still in place.

Check your IUS is in place a few times in the first month, and then after each period or at regular intervals. 

Removing an IUS

An IUS can be removed at any time by one of our experienced clinical team. You do not require an appointment for one to be removed - you can drop into one of our many clinics across Wirral. Download our clinic timetable.  

Who can use an IUS

Most women can use an IUS, including women who have never been pregnant and those who are HIV positive. Our clinical team will ask about your medical history to check if an IUS is the most suitable form of contraception for you.

Your family and medical history will determine whether or not you can use an IUS. For example, this method of contraception may not be suitable for you if you have:

Download the Family Planning Association guide to the IUS.