Contraceptive Coil

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A contraceptive coil is a form of birth control (contraception) called an intrauterine system (IUD).

It is placed inside your uterus. Some types release a hormone called progesterone, called an intrauterine system (IUS)– the same hormone found in contraceptive pills. A hormonal coil can also be used to treat heavy periods.

The IUD coil is made of copper. The copper alters the cervical mucus, which makes it more difficult for sperm to reach an egg and survive. It can also stop a fertilised egg from being able to implant itself.

An IUS is a small, T-shaped plastic device that's put into your womb (uterus) by a doctor or nurse.

It releases the hormone progestogen to stop you getting pregnant and lasts for 3 to 5 years, depending on the brand. The coil is a small, plastic T-shaped device. It slowly releases progesterone; not only preventing pregnancy but also making your periods lighter and less painful by:

• Thickening  the mucus in your cervix preventing sperm from traveling to fertilise an egg
• Making the lining of your uterus (endometrium) thinner preventing an egg from implanting
• Preventing ovulation (in some women)

Hormonal coil fitting takes between 15 and 20 minutes. It is usually fit within 7 days after the start of your period. 

During your visit you will have:

• A consultation with a Consultant Gynaecologist
• Full history taking and pelvic examination
• Blood pressure assessment
• Contraception review
• Coil fitting (range of coils available including hormonal and non-hormonal)
• Removal of existing coil 
• Detailed written report emailed or posted to you and your GP
• Prescription arrangement

Your consultant will check to make sure you are not pregnant, that you do not have any existing infection in your womb and the size and position of your womb. 

The device is inserted through your cervix into your womb. Two fine threads attached to the bottom of the coil will remain at the top to your vagina. The threads allow you and your gynaecologist to check the device is in place. 

Coil fitting can be uncomfortable however most women do not experience any pain.

We advise patients to take simple pain killers (e.g., paracetamol) if no contraindications - 30mins prior to their coil fitting or removal appointment.

You may feel cramping similar to period pain just after your fitting. Take over the counter pain killers such as paracetamol to ease this symptom. It is not unusual to experience light vaginal bleeding for a few days. 

Your consultant or nurse will probably want to see you for a follow-up after your first period. You can continue to wear your hormonal coil for five years. It will need to be replaced or removed by a trained professional. 

Most women experience no symptom following hormonal coil fitting. You should contact your consultant or nurse if you experience:

• Continued abdominal pain following fitting
• Unusual vaginal discharge
• If you think your coil has dislodged (fallen out) 

Who is it for?
Every woman considering having a coil fitted (IUD, IUS, Intrauterine Device) for contraceptive purposes.

How often?
As required.  Most coils will need removing after 5 or 10 years depending on the type.