What is an IUS (intrauterine system) or hormonal coil?

Brand names: Mirena, Levosert, Kyleena, Jaydess, Benilexa

• An IUS (intrauterine system), also called a hormonal coil, is a small plastic T-shape that a doctor or nurse puts into your womb (uterus). It stops pregnancy by releasing the hormone progestogen into your womb.
• An IUS is not suitable for everyone.
• An IUS is over 99% effective and lasts for 3 to 8 years, depending on the type.
• An IUS is safe to use while breastfeeding and can usually be fitted soon after giving birth.
• After an IUS is removed your fertility returns to previous levels straight away.
• An IUS can make periods lighter, shorter, and less painful. It can be an effective treatment for heavy periods.
• An IUS can be used as part of hormone replacement therapy (HRT) for menopause symptoms.
• This information is about the hormonal coil. For information about the copper coil, see intrauterine device (IUD).
• You can compare different methods, including how well they work and side effects, when choosing a method of contraception.

An IUS does not stop you getting or passing on sexually transmitted infections (STIs). Use a condom every time you have sex to protect you and your partner against STIs including HIV.

Where can I get an IUS?

Contraception services are free and confidential on the NHS.

You can get an IUS (intrauterine system), also called a hormonal coil, for free from:

• sexual health clinics, also called family planning or contraception clinics
• some GP surgeries
• some young people's services (call the national sexual health helpline on 0300 123 7123 for more information)

Can I get an IUS?

A doctor or nurse will ask about your medical history to check if you can get an IUS (intrauterine system), also called a hormonal coil.

An IUS may not be suitable if you have:

• breast cancer, or have had it in the past
• cervical cancer or womb (uterus) cancer
• a liver condition
• unexplained bleeding between periods or after sex
• a history of serious heart disease or stroke
• a sexually transmitted infection (STI) or pelvic infection
• problems with your womb or cervix, such as fibroids

If any of these apply to you, speak to the doctor or nurse about your contraception options.

Getting an IUS after giving birth

An IUS can sometimes be fitted within 48 hours of giving birth. But you'll usually be advised to wait until 4 weeks after birth to have an IUS fitted.

It's possible to get pregnant from 3 weeks (21 days) after giving birth. It's important to use another form of contraception, such as condoms, until your IUS is fitted.

Breastfeeding with an IUS

It's safe to have an IUS when you're breastfeeding, and it will not affect your baby or your milk supply.

Getting an IUS after a miscarriage or abortion

You can get an IUS straight after an abortion or miscarriage. You'll be protected against pregnancy straight away.

Getting an IUS during menopause

An IUS can be used as part of hormone replacement therapy (HRT) to treat symptoms of menopause. It is also effective as contraception when used for this reason.

IUS and medicines

An IUS is not affected by most other medicines, including prescription medicines or herbal remedies.