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There are different medications for ADD, most common are the "stimulant" medications such as Ritalin, Adderall & Dexedrine.
Ritalin is a brand name of the drug "methyphenidate" which treats daytime drowsiness symptoms of narcolepsy and chronic fatigue syndrome. Adderall is also a stimulant like Ritalin but uses mixed amphetamine salts. Similar to this would be the brand Dexedrine (generic drug: dextroamphetamine sulfate).
I don't know if you just confused yourself with Metamphetamine with the generic drug of Ritalin which is methyphenidate. Metamphetamine is also a stimulant and it is related to an ADHD & anti-obesity medication dextromethamphetamine (brand name Desoxyn). Desoxyn is used to treat ADD only if methylphenidate caused too much side effects.
Phentermine, on the other hand, is an appetite suppressant of the amphetamine and phenethylamine class.
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