Methylphenidate (Ritalin, Concerta) is commonly prescribed to treat attention-deficit/hyperactivity disorder (ADHD), but a new analysis finds children taking it are more likely to have sleep problems and decreased appetite, among other issues...We asked a noted expert in ADHD treatment, Andrew Adesman, MD, chief of developmental and behavioral pediatrics at the Steven & Alexandra Cohen Children’s Medical Center of New York, New Hyde Park, to address questions about the new research.