Etonogestrel
"So Implanon pros and cons... Pros. It's hidden well and has a 99% effectiveness rate. Awesome. Cons. I've had mine in for over a year now. The side effects don't hit you the first month. They slowly drag. I have been absolutely miserable with this with so many of the side effects. They're not always something you can get used to. I can't tell you how many times I've been to the doctor within the last two months. Getting this thing out as soon as possible."