Ritalin is a stimulant, a type of medicine that increases alertness. As with other
medicines, each child can respond to it differently. Many kids using Ritalin have
few, if any, side effects. Others have side effects like stomachaches, insomnia, decreased
appetite, growth problems, irritability, and blood pressure problems.
Be sure to talk with your son's doctor if you need more information about ADHD,
as well as its treatments and their possible side effects.