Buy Dexedrine 5mg Pills Online. Dextroamphetamine treats attention deficit hyperactivity disorder (ADHD). Narcolepsy (a sleep disorder), and is sometimes prescribed off-label for its past medical indications. Such as depression and obesity. Long-term amphetamine exposure at sufficiently high doses in some animal species is known to produce abnormal dopamine system development or nerve damage, but, in humans with ADHD, pharmaceutical amphetamines appear to improve brain development and nerve growth