Levonorgestrel
"I have had the Mirena for a little over 2 years. At first it was a real pain! It hurt so bad to have placed and I had a heavy period for almost 2 months straight. But then the bleeding stopped completely. Overall, I really like having it. It has helped me have fewer migraines, it is so great to not have a period and love not having to worry about getting pregnant. However, I do have bloating, painful cramping every few weeks, and I've just started having some back pain which I think may be connected. Right now I can tolerate the side effects for the benefits it gives. I have thought about getting it taken out, but I really don't want to go back to horrible migraines or any other form of birth control."