And yet, it's completely illegal for me to travel to Japan for even a day with my ADHD medication. I could be carrying my script, a letter from my doctor, and have literally only a single days supply, and I'd be risking a very serious prison sentence.
Outside of North America, even in places like Europe and Australia, ADHD is still close to non-recognised. Take Australia for example, if you assume 2-3% of the population has ADHD, and that every single one of them has to see a psychiatrist once a year to get their medication permit renewed so that their normal doctor can proscribe their medication (which is the legal requirement for ADHD in Australia), it would consume 2x the entire Australian psychiatrist workforce to deliver that many consultations... And that's if they were EXCLUSIVELY seeing ADHD patients...