I was on this medicine as a child but I don't remember much about how it affected me. Now I'm 19 and in college and just been put on it again because teachers recommended it. I talked to my doctor and he has me taking 5Mg a day and every week going up to another 5 to see what dose works. I had looked up this drug and from my understanding it's suppose to give you energy but I just feel tired and like I may get sick and I notice no difference with my mind. I still have trouble focusing along with other things. Why?