ritalin

As a proper noun Ritalin

is a trademark for methylphenidate used to treat attention deficit hyperactivity disorder.

As a noun dexamphetamine is

dextroamphetamine.

As proper nouns the difference between ritalin and adderall

is that ritalin is (pharmaceutical drug) a trademark for methylphenidate used to treat attention deficit hyperactivity disorder while adderall is (trademark) a psychostimulant medication containing amphetamine and believed to work by increasing the amount of dopamine and norepinephrine in the brain.

As a proper noun ritalin

is (pharmaceutical drug) a trademark for methylphenidate used to treat attention deficit hyperactivity disorder.

As a verb concerta is

(concertar).