Pupil Dilation, Straterra, Concerta, ADD

Hi,

Im 16 and was on strattera for about 2 months.My doctor noticed that I had dilated pupils. I didnt know if it was because of my strattera, or if it was interacting with my acne medication accutane. well anyway, as far as my ADD is concerned, the straterra worked for a while, but I found after a month or so that i was still having problems concentrating with my ADD. So now my doctor put me on Concerta. Does anyone have any problems with concerta? How long does it take to work. Im only on 18 mg a day right now, and is there any pupil dilation?

thanks
boatman25