Unqualified blanket statements (such as the above) are not helpul as they can be inaccurate if not downright wrong.
Ritalin is similar to Adderall and is allowed there.
Dexedrine is similar to Adderall and is not allowed there.
Sudafed is not similar to Adderall and is not allowed there.
I look forward to your dull, but exact, list of all 4650 stimulants that are illegal in Japan. After all, anything else might lead to confusion for those unable to parse English.
