"so i&#039;ve been on the nexplanon for 3 years and 6 months. had it for the first 3 years and i noticed that i had gained quite a bit of weight, roughly 50 pounds. my doctor recommended that i get it again because it was so effective, so i agreed. i&#039;m about 6 months in and i&#039;ve already gained 12 more pounds, mood swings, low libido, and sever depression. oh and i also have an ovarian cyst, which i think was caused by the increase in hormones. this birth control is terrible i do not recommend it."