Etonogestrel
"I've had the Implanon since August 2007.  No pain when inserted.  I've been having my periods twice a month for 7 days each time since I got it.  I've gained 25 pounds and have hair loss.  I get headaches, and back aches around time for my monthly cycle. LIBIDO is gone, no desire to have sex.  Needless to say I am now single.  It's time for it to come out, but I'm thinking about getting it again because the reviews I've read for other birth controls have me scared!"