my son has been diagnosed with adhd since 1st grade. he started on ritalin only for about a month. i was uncomfortable with that one so they switched him to concerta for about 6 to 9 months. then he was switched to metadate for awhile. Now for the pass 2yrs he has been on Adderall. He started at the lowest and is now on 30xr. My concern is his growth. He is very short for his age. he is now in the 5th. but looks like he could be in the 3 or 4th still. He starts middle school next year. Could these meds have an affect on his growth. What can i do about this?