Ritalin and Focalin are both medications used in the treatment of Attention Deficit Disorder (ADD) and Attention Defecit Hyperactivity Disorder (ADHD). Ritalin is methylphenidate, which is a medication that stimulates the central nervous system. Focalin is dexmethylphenidate, which is a modified version of Ritalin. It also stimulates the central nervous system, but contains only the most active component of the drug. Individuals who have used both these drugs have found that Focalin is less addictive, but does have a higher frequency of causing headaches as a side effect over Ritalin.