I have no experience with the mirena but I did have the paraguard IUD for 3 years could be left in for 10yrs. I went with that one because it has no hormones at all. I will say insertion wasnt as bad as I thought it was going to be, and my first period afterwards was very painful and heavy, as the months went by it got back to normal. I had no side effects, no pain, nothing...which is scary considering I found out I had a very bad infection and the IUD had dropped lower than desired when i went for my yearly. Had to take the IUD out and was on 6 weeks of antibiotics. Had I not been seeing the doc regularly doc said I could have ended up with a hysterectomy.They say infection is rare..guess I was one of the unlucky ones. so I cant say I recomend it, but again nothing may go wrong.
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