Mirena - LNG IUS

Mirena - LNG IUS


How does the Mirena work?

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Although the LNG-IUS is physically similar to other IUCDs, its main mode of action is similar to progestogen-only pills. The mucus in the neck of the womb remains thick and hostile to sperm throughout the menstrual cycle; this thick mucus prevents sperm reaching the eggs and fertilisation is therefore unlikely to occur. Furthermore, the lining of the uterus remains thin so that even if an egg should be fertilised, a pregnancy cannot be supported. For some, the question of how the IUCD prevents pregnancy is critical. As IUCDs are effective partly after fertilisation, they may not be acceptable in some cultures. The Mirena functions almost entirely to prevent fertilisation.


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