EDIT - Oh "Addium" I thought you said Adderall. No idea what that is, but my comment is still relevant.
The use of ADHD-type medications is becoming a real concern for chess and competitive video games because it does provide noticeable improvement to concentration and clarity of thinking.
The debate has similar parallels to using Performance Enhancing Drugs in physical sports... but it does get trickier as you question whether you should ban someone from a competition who has a legitimate medical authorization.
On one hand, almost everyone will get a note because of the clear advantage... On the other hand, you could be depriving a really good player of an opportunity to perform because of a legitimate medical condition (which leads down another rabbit hole of debate)...
My one thought was would they have to drug test people playing major tournaments? Lots of things to consider with the new "brain" drug..