Etonogestrel
"I had the Implanon inserted in June 2011 and had it taken out recently in June 2014 when my three year mark was up. I'm giving it a six because it did prevent pregnancy in my case. Pros from my experience: No periods & no pregnancies.
Cons from my experiences: 80lbs weight gained(I also had some family issues, work & school. Not blaming it all on the birth control). NO sex drive at all I was never in the mood, and my feet seemed to get bigger. Other than that its a great birth control. It works effectively on other people. Some have no weight gain and some do. I do recommended this because it does work great for preventing pregnancy!"