"i had the implanon for 3 years before getting nexplanon. the doctors told me nexplanon was the same as implanon, but it&#039;s definitely not. on implanon, i gained some weight over the 3 years (probably 15 lbs) but i was able to lose it with exercise. the nexplanon is terrible. i&#039;ve gained probably 30 lbs since i had it put in in january 2014. i&#039;m moody and have no sex drive. i exercise regularly and eat fairly well. i keep gaining weight and i hate it. i love the convenience of this birth control but i can&#039;t handle the side effects. i&#039;m giving it 3 more months to see if my body can adjust to it but if not.....i&#039;m done. whatever they changed from implanon to nexplanon was a terrible decision."