Strattera^® (atomoxetine hydrochloride) is the only non-stimulant medication that is licensed for the treatment attention deficit hyperactivity disorder (ADHD). The prescription medicine is used to treat ADHD in children, teenagers, and adults. It works by affecting a chemical in the brain called norepinephrine. A few side effects of Strattera include loss of appetite, insomnia, and vomiting. Some of the conditions you should let your healthcare provider know about before you take Strattera include bladder problems, high blood pressure, and heart problems of any kind.