Methamphetamine is literally used as a treatment for ADHD. It’s also fairly easy to get a hold of amphetamine on the darknet which is used in things like Adderall. It honestly isn’t that bad of an idea to try amphetamine or even methamphetamine if you actually know the correct dosage range. Recreational users would typically start at a higher dosage than someone looking for medicinal effects. Over time though medical users can end up on a similar dosage to a recreational user due to tolerance.