ScienceDaily (Feb. 21, 2008) — Fragile X syndrome (FXS) is the most common hereditary form of mental retardation. Many children with FXS also suffer from attention deficit and/or hyperactivity disorder (ADHD), which complicates social relationships at home and at school. Although stimulant medication such as Ritalin® is often successfully used to treat children with ADHD, studies have shown that while it is effective in children with mental retardation, it also causes side effects such as increased irritability, decreased verbalization and social withdrawal.
