"no problem, never really felt high or speedy. when i didn&#039;t take it i was very disorganized and couldn&#039;t focus. i find that when it is out of my system after 12 hours i am extremely tired. i take trazone 50 mg. for sleep also really hard to get going in the morning. after the vyvanse kicks in i&#039;m ok at about 8 after taking it at 6am. i do take xanax 1 mg. with it."