Etonogestrel
"I got Implanon in October 2011 while on my period. At the end of that cycle I did not get my period again until October 2012. It was the best year ever! No mood swings, not worrying about a pill, my weight stayed the same, and my sex drive increased. I'm also a huge whimp about needles but insertion didn't hurt. However, from Oct 2012- present (Jan 2013) I've gotten my period erratically from every other week to every 2 weeks. I'm going on vacation soon and the unpredictability of the medicine is starting to seriously irritate me (and put a damper on my daily routine). I hate to give it up because the first year spoiled me so much! But I'm afraid the aggravation of the unknown may have me removing it in the very near future.."