It’s basically the last resort adhd medication. It’s because the way we classify medication means that potential for pharmaceutical benefit (as recognized by the federal government) is a factor in whether a drug has legal uses.

This results in the fun scenario where heroin (general analgesic and other opiate traits), cocaine (topical analgesic), and meth (adhd and narcolepsy treatment) are all more legal on a federal level than cannabis, lsd, and psilocybin.