I would like some understanding of focalin (dexmethylphenidate) xr?

Methylphenidate: (original trade name ritalin) is a mixture of d- and l-methylphenidate. The d- and i- are enantiomers or molecules that are mirror images of each other. Focalin is d- or dexmethylphenidate which is more potent than the l-methylphenidate. Focalin xr is extended release to last longer. Side effects are similar and some people respond better to one versus the other. Both are good options for adhd.

Focalin: Focalin / Focalin XR (Dexmethylphenidate) is for the treatment of Attention Deficit Hyperactivity Disorder (ADHD). Focalin lasts for around 4 hours & Focalin XR may last for up to 12 hours.