Stereoisomersic Dexmethylphenidate (sold commercially by Novartis as Focalin, also available generically in the US exclusively from Teva) is a pharmaceutical drug used to treat ADHD. It is a psychostimulant dopamine reuptake inhibitor that affects the central nervous system. Dexmethylphenidate has a 4-6 hour duration of effect (a long-acting formulation, Focalin, which...