Intrauterine Progestogen (Mirena® Coil) in HRT
The Mirena® coil is a small device inserted into the womb that slowly releases a progestogen called levonorgestrel. It provides long-term protection for the womb lining and is often used as part of HRT for women who still have a uterus.
How does it work?
- The Mirena® coil releases a low dose of progestogen directly into the uterus, helping to prevent the lining from thickening.
- It provides local protection with minimal absorption into the bloodstream.
- It also acts as contraception, which may be helpful for women in perimenopause.
Benefits
- Long-acting: Provides protection for up to 5 years.
- Low maintenance: No need for daily tablets or regular dosing.
- Fewer systemic side effects: Less likely to cause mood changes, bloating, or breast tenderness.
- Additional benefits: Can reduce or stop menstrual bleeding, which may be helpful for women with heavy periods.
Potential Drawbacks
- Requires a fitting procedure: This is usually done in a clinic and may cause mild discomfort.
- Initial side effects: Spotting or irregular bleeding may occur in the first few months.
- Not suitable for everyone: Rarely, some women may experience headaches, breast tenderness, or mood changes.
When Might the Mirena® Coil Be Recommended?
You may be offered the Mirena® coil if:
- You are using oestrogen-only HRT and need womb protection.
- You want a long-term, low-maintenance option.
- You have heavy periods and want to manage both menopause symptoms and menstrual bleeding.
- You are sensitive to oral progestogens or have had side effects.
Duration of Use
- The Mirena® coil provides protection for up to 5 years.
- After 5 years, it must be replaced if you continue to need progestogen.
- Your GP will review your HRT regularly to ensure the coil remains the best option for you.
Key Safety Message
If you have a uterus and are prescribed HRT, you must remain on progestogen to protect your womb lining.
The Mirena® coil is a safe and effective option that offers long-term protection with fewer side effects.
Never stop or remove the coil without medical advice.