"i&#039;ve heard nothing but good things about this form of birth control, so i decided to give it a try. it is implanted and lasts for about 3 years. being a 21 year old college student, that was perfect. i&#039;m going to warn you, the implantation process hurts. i have a high pain tolerance and it was painful. not worth crying over, but definitely painful. my arm hurt for like a week after the initial implant. i kept my arm wrapped, for more cushion and support. if i would move my arm a certain way i would feel a sharp pain shooting in my arm. after about a week the swelling and bruising went down and no more sharp pains. i had no other side effects. no emotional changes, no weight gain, no acne, ect. minor abdominal cramping, but that&#039;s it (:"