It works well but shakes me when taken with coffee. I have been in it for over 10 years. Start small with a low dose and work your way to a dose that works best for you. Surprisingly, I slowly lowered my volume but still felt awake (especially). It’s not as good as Ritalin for strength training, like when I need to drive long distances. Don’t try to double it, all I got was a blind head! The very natural feeling of caution compared to Ritalin can make me a little “buzzy”.