Mirena for Heavy Periods
Although the IUS was originally developed as a contraceptive, the discovery that it leads to much lighter periods was a great bonus. Many gynaecologists now suggest the Mirena as a treatment for heavy periods if tablet treatment doesn't work.
After 3 months use, the average blood loss is 85% less, and by 12 months the flow is reduced by 97% every cycle [2]. About one third of women using the IUS will not have any periods at all. Although women initially find it a bit unusual not having periods, it doesn't cause any problems. There is no 'build up' of blood, because the hormone in the IUS prevents the lining of the womb from building up at all. Often it is the excessive thickening of this lining that is the cause of the problems in the first place.
One study looked at 54 women who had heavy periods and were awaiting hysterectomy [3]. They all used the Mirena, and just under 70% were taken off the waiting list because they were happy with the treatment. In another study of 50 similar women, 82% avoided major surgery [4].
The Mirena is now licensed for treating heavy periods, and although this official licensing is relatively new, it has been used 'off-license' for some time in this way.
Painful Periods
Although the IUS isn't primarily used for painful periods, two studies [4,5] have found that it does help in many cases (as often as 80% of the time). If painful periods persist, it is usual to rule out any other problems with a laparoscopy