"i have been on the nexplanon for just about a year and don&#039;t have very many complaints about it. the implant was administered after my obgyn injected me with meds to numb the area and i was surprised that it couldn&#039;t feel a thing! for the next 1-3 weeks, my arm was bruised and the site itched a lot but eventually faded away. i did notice that i lost 5-10 pounds in my waist, of which i was very excited about. normally, i&#039;m a coffee drinker who can drink a cup of black coffee and 30 minutes later, go right to sleep. now, i am extremely sensitive to caffeine. coffee, tea, or even excedrin were making me feel anxious. since then, i&#039;ve stopped the caffeinated drinks and replaced them with water. i love it! no babies! well... for now."