birth control
"I had Implanon inserted on 1/08 and it is the greatest birth control ever.  I have not had a period since then, very little in the way of mood swings, and no pregnancy.  I was very bad at taking the pills regularly, and the shot gave me migraines like no others I've ever experienced. I do have acne now, and weight gain (but I would bet that's from other lifestyle changes also)."