Levonorgestrel
"I'm 22 & nulliparous. I've previously used pills & nuvaring, & didn't have bad side effects (except for no libido) but I wanted something long-term. I chose Skyla after discussing it with my gyno. She had me take misoprostal orally the night before insertion, & insertion was definitely uncomfortable, but bareable. I would recommend bringing someone with you to drive you home, because I had a 30 min drive home & all I wanted to do was lie down. Had cramping the rest of that day & part of the next, but that's it. I've now had it for just over 2 weeks & LOVE it. My sex drive is back & I've had little/no cramping! I got my period a few days ago right on time and it's lighter than normal! Will update review in a few months"