Focalin is primarily a methylphenidate, like Concerta, but it does have an added component of Dex in it (Focalin = Dexmethylphenidate, Concerta = Methylphenidate). My son does well on Concerta, but didn’t sleep for 24+ hours when he tried Focalin. Of course, that was just him and he’s very sensitive.
Here are user reviews for Focalin, but, the only way to really know how it will work for your son is to try it.
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism