What is the Mirena?
Mirena is a hormonal intrauterine device (IUD) that releases a small amount of progestogen (levonorgestrel) locally into the uterus. It's over 99% effective for contraception and lasts up to 8 years.
Because the hormone is released directly into the uterus, the dose is much lower than the pill, and very little enters your bloodstream. This means fewer systemic hormonal side effects for most women.
Benefits beyond contraception
Mirena is also used to treat heavy periods — many women find their periods become much lighter or stop altogether. It's also used as the progesterone component of MHT for menopausal women, and can help with endometriosis and period pain.
This makes it a versatile option for women who want contraception plus management of heavy or painful periods in one device.
What to expect
Mirena is inserted in a quick in-person procedure by a trained clinician. You may experience some cramping and spotting for a few days afterwards. Irregular spotting is common for the first 3–6 months, after which periods typically become lighter or stop.
Your GP can provide counselling on whether Mirena is right for you, discuss the benefits and risks, and arrange a referral for insertion. They'll also check in after insertion to make sure everything is settling well.
Related condition
Contraception & the pill →References & sources
This content is general information and not a substitute for individual medical advice. Please consult a GP for your personal situation.
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