"i took adderall for approx. 6 years. i started off taking 10mg twice a day. the last year of college i was taking 30mg time release twice a day. i feel that i did benefit from the medication during my last year of highschool and throughout college. my grades were b&#039;s and above, and during the first three years of highschool i would jump for joy if i earned a b. so having said that, yes adderall did help with my ability to focus, retain information, and to some degree my determination to complete tasks throughout the day. there was a huge price to pay for taking adderall for as long as i did. my metabolism slowed down immensely and maintaining the same diet and exercise i am 50lbs heavier. doctor told me i would gain 40-75lbs and i did."