After 30 years of worldwide use, the Mirena intrauterine contraceptive device (IUCD) remains at the top of options for so many women with menstrual issues. Its clever design of delivering the minimal effective dose of protective hormones directly to the uterus in a constant manner, with almost negligible body absorption, has meant that the benefits- versus-side-effects trade-off is still one of the best.
How Mirena works and how long it lasts
The Mirena’s menstrual suppression usually lasts 3–5 years, while its contraceptive effect can last up to 8 years. For most women, periods become 80–90% lighter, and up to two-thirds have no menstrual bleeding.
This is generally safe, as Mirena reduces the risk of endometrial disorders. Period pain is also likely to improve substantially, with or without co-existing endometriosis. Mirena can help manage menstrual problems from the mid-teen years through to menopause, and research consistently shows improved quality-of-life scores across these groups. However, it may not resolve every issue.
Is there a downside to the Mirena?
One commonly reported problem is intermittent breakthrough bleeding mid-cycle, which can be difficult, although short-term treatments may help settle it. Other issues, such as infection, migration into the uterine wall, or expulsion, are very uncommon.
Removal due to mood changes, headaches, or weight gain is also uncommon. In fact, Mirena is sometimes used to help manage period-related headaches and can greatly improve quality of life for women with heavy menstrual bleeding. Iron stores and anaemia commonly improve significantly within the first six months of use. Mirena is commonly inserted in medical rooms, but it can also be inserted under general anaesthetic.
Who Mirena is suitable for
Mirena may be suitable for:
- Women with heavy or prolonged periods, including those with anaemia.
- Women with period pain or endometriosis‑related pain.
- Women seeking reliable long‑acting contraception that is reversible.
- Perimenopausal women needing bleeding control and, in some cases, part of hormone therapy plans.
Your individual risks and benefits will always be discussed in detail at consultation.
Thinking about Mirena?
If you are experiencing heavy periods or painful periods, or are considering long‑acting contraception, you can book a consultation with Dr Guy Skinner to discuss whether Mirena is right for you.
Book an appointment or call 03 9417 0147.
Mirena IUCD FAQs
What is the Mirena IUCD? The Mirena IUCD is a small T‑shaped hormonal intrauterine device placed inside the uterus. It releases a low dose of levonorgestrel (a progesterone‑like hormone) to thin the uterine lining, reduce bleeding and provide highly effective long‑acting contraception.
How long does Mirena last for contraception and period control? Mirena is licensed for up to 8 years of contraceptive use in many regions, with very low failure rates in years 6–8. Its effect on period control (lighter bleeding, fewer periods) is usually most noticeable in the first 3–5 years, although many women continue to have reduced bleeding beyond this.
How effective is Mirena as contraception? Mirena is more than 99% effective at preventing pregnancy and is one of the most reliable reversible contraceptive methods available. Fertility typically returns quickly once the device is removed.
What are the common side effects of Mirena? The most common side effects are changes in bleeding pattern, especially in the first 3–6 months (irregular bleeding, spotting, or occasionally heavier bleeding), abdominal or pelvic pain, headache or migraine, and breast tenderness or acne. For many women, these symptoms improve over time.
Will Mirena stop my periods completely? Many women find their periods become much lighter, and up to one‑third to one‑half stop having periods altogether (amenorrhoea) after the first year. This is usually safe and expected with Mirena, and it is part of how the device helps with heavy bleeding and anaemia.
Does Mirena cause weight gain or mood changes? Large studies suggest that significant weight gain or severe mood changes are uncommon, but some women do report them. If you notice bothersome changes in mood, anxiety, depression or weight after insertion, discuss this promptly so your options (including removal) can be reviewed.
Can Mirena help with endometriosis and period pain? Mirena often reduces period pain and pelvic pain, including pain related to endometriosis, by thinning the lining and suppressing ovulation in some women. It is commonly used as part of the management plan for endometriosis and heavy periods.
How is Mirena inserted and removed? Insertion is usually performed in the consulting rooms as a short procedure. Some cramping and light bleeding are common immediately afterwards. For women who find procedures difficult or who have specific clinical reasons, Mirena can be inserted or removed under general anaesthetic in a hospital or day‑surgery setting.
What serious risks should I be aware of? Serious complications are rare but can include pelvic infection, expulsion of the device, embedment or perforation of the uterus, and, in very rare cases, sepsis or severe allergic reaction. An urgent medical review is needed if you develop severe pelvic pain, fever, or heavy bleeding, or if you can no longer feel the IUCD strings when you usually can.
