Levonorgestrel
"I had my Skyla inserted in May of 2014. I have a condition that I have to take medication  which limited me from the use of other birth controls. Skyla gives me a lot more comfort because it is more effective than other methods of birth control. I do get cysts that grow on my uterus and rupture mostly before my cycle which is very painful, but the pain is worth the results! I highly recommend this birth control."