Levonorgestrel
"I had the Mirena inserted 9 months ago, it is now September and boy do I REGRET it! I got it to treat menorrhagia and polyps because I was getting my period every other week and I would have to double up on super tampons and pads. So my doctor recommended the Mirena, well I got it inserted and for the first few months I was bleeding very heavily for 17 days straight and finally when I thought my body got adjust it just didn't, it goes from bleeding past 31 days! To at least 9 days, it's honestly terrible. I've had horrible back pain and crampin it's the worst thing I've ever experienced, But the worst part is that I'm bleed so much I have become so very anemic . The polyps are gone so I'm going to try to stick it out a little longer."