My Dr. prescribed me adderall...he only let me take it for only 3 months because of the risk of addiction...well, i lost over 50lbs. in that first three months! And in the six months since, I've lost another 30+! It was a godsend for me, but i can also see why some may develope an addiction to them...the way that make you feel is incredible...if I'd taken them longer than 3 months, i probably would have gotten addicted, but i have an addictive personality, so someone without an addictive personality, would probably be fine...:)