We are currently trialing medikinet xl for DS1 (6yrs). The Paed has started him on 20mg, which seems high to me, and it's not going great. It seems to take up to 1.5hrs to kick in and then it seems to work sometimes and not others. Admittedly it's only been 5 days, but life hasn't really improved. I would like to try different doses/meds but the Paed has been reluctant to diagnose ADHD (he is on the fence) largely due to school's scores for inattention and peer relations, both of which we believe to be significantly underplaying DS1's difficulties. Can anyone point me in the direction of respected medical literature which backs up the anecdotal evidence that the same child will react differently to different meds/doses even if they all have the same active ingredient. The Paed seems to think if one med doesn't work none of them will and vice versa.