Attention deficit hyperactivity disorder management
There are two major medications derived from methylphenidate's isomers: a racemic mixture of half d-threo-methylphenidate and half l-threo-methylphenidate called methylphenidate (Ritalin, Concerta), and an enantiopure formulation containing just d-threo-methylphenidate called dexmethylphenidate (Focalin).
Novartis
In September 2008, the US Food and Drug Administration (FDA) sent a notice to Novartis Pharmaceuticals regarding its advertising of Focalin XR, an ADHD drug, in which the company overstated its efficacy while marketing to the public and medical professionals.