Mirena : LNG-IUS

What is Mirena?

The Mirena is a type of hormonal coil. It’s very small and is inserted into your womb (uterus) where it gradually releases a hormone called levonorgestrel, a type of progestogen, into your womb. It is effective upto 5 years

The origin of LNG-IUS dates to 1970 where it was initially developed as a contraceptive device.

Though it is a highly effective reversible form of contraception, its role in the treatment of heavy and painful periods, early-stage Uterine cancers, and in hormone replacement therapy (HRT) is very well studied.

How Does Mirena Work?

For treatment of Heavy and Painful Periods :

The Mirena is recommended as a first‐line treatment for heavy bleeding because the low dose of progestogen controls the development of the lining of the womb – it makes it thinner, which usually leads to periods becoming lighter and shorter or stopping. One study found that the levonorgestrel-releasing IUS (such as Mirena) can reduce blood loss by more than 90% over 6 months for most women with heavy menstrual bleeding.

For Contraception :

The Mirena thickens the cervical mucus, making it difficult for sperm to get to the egg, and keeps the lining of the womb too thin to support a pregnancy. It’s therefore a highly effective form of contraception – it is over 99% effective. It is safe, easy to use – once it is fitted, you don’t need to do anything – and it is useful for those who may struggle to remember to take a tablet. It is also a reversible method of contraception.

Image showing MIRENA intrauterine device.

Possible Side Effects

• Irregular bleeding or spotting.

• Hormonal side effects such as headaches, breast tenderness, or mood changes.

• Risk of expulsion or perforation during insertion.

Mirena is an LNG releasing intrauterine device with multiple advantages. It reduces the duration and amount of abnormal menstrual bleeding and significantly decreases pain associated with benign pathologies such as adenomyosis, fibroids, and endometriosis.

Women considering Mirena should discuss it with their healthcare provider to understand its benefits and risks fully.