Levonorgestrel
"I have had the Mirena for 2 years now, and its one of the best birth control methods. I get more acne than I used to but its worth knowing that I'm unlikely to become pregnant. Over the time I've had it there has only been one bad experience over all. It was from the Mirena moving, and it hurt. Overall I would recommend the Mirena but not to anyone who is a teenager."