A new once-daily attention deficit hyperactive disorder (ADHD) drug developed by prodrug specialist Kempharm Inc. has won FDA approval under the brand name Azstarys. The medicine combines serdexmethylphenidate, Kempharm's prodrug of the CNS stimulant dexmethylphenidate, with immediate-release d-MPH, the core medicine in the now off-patent product Focalin, a refined formulation of Ritalin.