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While their exact mechanisms remain under study, these medications are believed to amplify the effectiveness of neurotransmitters such as dopamine, norepinephrine, and serotonin. Key Differences . 1. Composition: – Dexedrine contains d-amphetamine exclusively. – Adderall is a blend of d-amphetamine and l-amphetamine in a 3:1 ratio. Extended-release versions, such as Adderall XR, provide a mix of immediate-release and delayed-release amphetamine. 2.