Levonorgestrel
"I have had a very hard time with Mirena. I have had it since May 2009, 18 months ago. The insertion was very painful - I could hardly catch my breath, and felt dizzy and nauseous afterwards. For the first year, I bled ridiculously. I would get maybe a week or 10 days between extremely heavy periods. The most frustrating part was that I called my doctor's office several times, only to be told that while my experience wasn't typical, I had to give it more time. I wanted to have it taken out, but kept hoping that things might get better. I still have it in. My periods are a little more normal now, but start really early with spotting for days before the regular flow starts. It certainly hasn't stopped my periods."