Etonogestrel
"I had Implanon inserted in July of '09.  I didn't have a period at all until Mother Nature showed up...ON NEW YEAR'S!  Not the way I wanted to start 2010.  I have gained 10-15 pounds since getting Implanon and have acne, mood swings, and I have bad moments where I don't even recognize myself. I don't like being moody. It's tearing my boyfriend and I apart."