Concerta is a prescription medication used to treat Attention Deficit Hyperactivity Disorder (ADHD) in both children and adults. It contains the active ingredient methylphenidate, which is a central nervous system stimulant that helps to improve focus, concentration, and impulse control. Concerta is available in extended-release tablets, which means that it provides a consistent release of the medication throughout the day, allowing for fewer doses and a more stable effect.