"i am a 59 year old man. i have taken adderall 30 mg. 3x daily for about 4 years. i am very happy with its performance; it has changed my life. it&#039;s hard for me to imagine all those years of struggling i went through before i was properly diagnosed. i tried vyvanse 70 mg. for one week. although it worked in a fashion similar to adderall, i feel as if i have better control taking the medicine 3 x a day. the vyvanse would wear off and then come back and start to work again and i found it disconcerting; it was like a roller coaster. with adderall, i can expect it will begin to wear off after 4-5 hours and i simply take another one, usually before it has lost its effectiveness, and i feel the same all day."