Hi, as I'm new and this post is a bit older, I'm if an answer is still wanted. There are different types of ADHD Meds and the US allows more in that context than other countries. For me there's only one difference, with my meda I can suppress the wish to dissociate better and lower my executive dysfunction. But I MD. Caution: I'm diagnosed and get my prescriptive meds. Using those without medical supervision is never a good idea.