Thank you very much for input. I have been on Ritalin for 2 days now and I have an abundance amount of energy. I was able to function on 6 hours of sleep... yay and work 10 hours today.... I definitely do not want to exert myself too much. However, even with only 2.5mg of Ritalin in my system, I am losing my appetite. It is weird, I may think I am hungry for a minute and then go to something else and not be hungry anymore ... Did that ever happen to you? Of course, I only lose my appetite after 12 noon, since that is when I take it...