This article was published on August 15, 2024. Additional material was added on August 16, 2024. Dexmethylphenidate (Focalin® and generic, Focalin XR® and generic) is the d-enantiomer of methylphenidate. It was developed because the efficacy of methylphenidate is believed to rest in its d-isomer (Markowitz and Patrick, 2008; Quinn, 2008). For more on dexmethylphenidate, please see the following…