Attention-deficit hyperactivity disorder (ADHD)

THE QUESTION Stimulants, which have a calming effect on children with attention-deficit hyperactivity disorder (ADHD), are the medication most often prescribed for this condition. How do two of these drugs — Ritalin and Focalin, a refined version of Ritalin — compare? THIS STUDY randomly assigned 132 children diagnosed with ADHD to take either Focalin, Ritalin or a placebo twice daily for four weeks.