Etonogestrel
"I got the Implanon in April 2010. I wasn't numb enough so it really hurt. The first 2 months or so were okay. No negative changes, very light spotting for a couple of days a month. Around month 3, I started gaining weight, became very moody, and stopped being interested in sex. It got worse and worse, and after gaining 30 pounds and becoming completely frigid, I had it removed at month 7. This was 2 months ago, and I still have not lost any weight, and my sex drive hasn't increased much. The ONLY good thing about this method is that once it's in, you don't have to remember anything for 3 years."