23/04/2026
Most women have never actually seen the Mirena coil. This is what it really looks like.
The Mirena coil is a hormonal IUD (intrauterine device), a small T-shaped device that sits inside the womb and releases a synthetic progestogen (levonorgestrel).
It works by:
• Thinning the womb lining
• Thickening cervical mucus
• Preventing pregnancy
It is one of the most effective forms of contraception and is licensed for up to 8 years.
It is also widely used as part of HRT (hormone replacement therapy) to protect the womb lining, and in this case is used for 5 years.
The Mirena can also help with:
• Heavy periods
• Painful periods
• Perimenopause symptoms
Understanding how it works and what it does can help you decide if it is the right option for you.
Always speak to your GP or pharmacist for personalised advice.