Levonorgestrel
"I have been on Mirena for 3 months now and it is amazing. I am 23 years old and have not had a child so the insertion was pretty painful. I had a lot of cramping after but nothing that some Aleve couldn't handle. Since then my periods have gotten significantly lighter. I have not experienced any difference with my weight (but I am hoping it will make me lose some). I have been on the pill and then the ring. Mirena is the best birth control I have experienced yet."