"When I first began taking it, it was very intense-my heart raced, I had too much energy. For a while it was great-the racing heart and too much energy wore off after about a week. 

It did become less useful over time, but not to a great extent. 

The trouble with Adderall for me, was taking two a day at the &quot;right&quot; times. It was really the second pill, figuring out the right time to take it, in a way so it would help me the rest of the day, but not so late it would disturb my sleep. Since I had/have a poor sleep schedule, that was challenging."