Etonogestrel
"I've had this birth control for 2 years now. Great form of birth control, never had to use a back up at all. Very convenient. I don't even notice it. Down sides are that I bleed for 3 out of 4 weeks a month and they are heavy. Also I have gained a lot of weight. I would not use this birth control again. Only because the pill seemed to work better for me."