Levonorgestrel
"I got my Skylah inserted last night and I've had it for about 15 hours now and I have to say reading the comments about insertion really freaked me out but it definitely wasn't as bad as I had anticipated it to be. I mean don't get me wrong, it hurt, but the pain lasted probably about a minute IF that! Now as far as after goes, the cramping has been pretty gnarly since about 3 hours after the insertion took place. I'm really hoping it doesn't last too much longer but over all it seems like a small price to pay for not having to worry for 3 years!! I hope it gets better from here and works as well as it's supposed to!"