"i have been using nexplanon for four years deciding to get it before enlisting in the usaf, and it hasn&#039;t caused any problems or adverse side effects. they numb the area where they insert the implant initially, and when it&#039;s time to replace it. you feel pressure, but in my experience no pain. while using this implant i have had very infrequent periods. or some heavy ones that lasted for only two, versus a week without the implant. i haven&#039;t gained any weight, though workout regularly so haven&#039;t noticed any effects. acne hasn&#039;t been an issue. i have been happy so far with this implant, and haven&#039;t needed to look into any other forms of birth control, and would recommend this to a friend or anyone thinking about getting it."