"i had implanon inserted may 2013 and still have it in now (january 2015). there have been positives and negatives. positives; i have not had a period since the insertion, i did not get pregnant, my arm was bruised for a day. negatives; i have no sex drive, have gained 35 pounds (rapidly) since the implant, i have slight mood swings and have been short tempered since starting this birth control method.  i have been on a strict diet for the last six months to lose weight and can not shed a pound. my implanon days are numbered."