ADHD medication abroad is something I've researched a bit, and my understanding is the USA is actually not the worse by any means. Many countries, including Japan, completely ban stimulants. While the financial burden should be easier with nations with single-payer healthcare, like Canada, there's still often the drug regulation stigmas that the USA has.

AFAIK it's only the under-developed nations that have easy access to Adderall. I found a rated world map on r/ADHD, but it just broadly rates "legality" and doesn't seem that informative because the USA and Canada is in the friendliest category. Please correct me if you have other info.