Aderall is an excellent drug if you are needing to concentrate for extended periods of time. I am not a physician so I am not going to make any claims as to what the drug actually does, but it is prescribed to some of my friends with ADD (they dont have ADHD, there is a difference). For my final exams in college I used to take one and not only did it make ME more alert (i empahsize me b/c some of my other friends said they felt no effect) , but it also allowed me to stay up for unusual lengths of time with out ever feeling tired.

*Disclaimer* These are personal experiences, not advice.