Levonorgestrel
"I've had my Mirena for about a year and I love it. The day I had it put in I had bad cramps for the rest of the day and after that I was fine. I haven't gotten my period since, which is fantastic. I didn't gain any weight, my moods haven't changed, and I haven't had any of the awful side effects I had heard about. Having Mirena is easier than remembering to take a pill every day. I highly recommend this form of birth control."