"my 6.5 yr old son takes 5mg xr on school days only.has been on it for 30 school days.  he does great in school and it appears a miracle help to him. it does seem to wear off too early so i will talk to the dr. about that next week. when he comes home from school and we try to do his homework it is a nightmare. he has a very mild case of adhd.  he eats well so far. he sleeps better and longer now than he did before starting the medicine. but a few weeks ago he told me he feels his heart beating fast and pains in his left side in physical education. took him for a complete cardio. check with ekg, ultrasound and all kinds of other tests. he checked out in perfect condition. so we will keep an eye out and see."