ADHD is another similar condition often confused with autism, but meds used to treat
ADHD may not be useful for the autistic, (
Ritalin comes to mind) even though at a glance someone would think they were the same thing.
Ritalin is a stimulant, aka upper.
Ritalin for the ADHD person in theory calms the person down. A friend I had in highschool who is ADHD explained that stimulants work reverse for people with his condition.