My son was on concerta for 2 years but would not gain weight, the doctor put him onStrattera just with the first pill he was very sleepy and could not stay awake. I don't want him on this medicine i have read to many bad things about it and hardly any good. Some of my friends kids take Vyvanse and sat bthere kids eat on it. Is it possible that it would not curb my sons appitite like concerta?