ADHD
"My son was diagnosed with ADHD (predominantly inattentive) two years ago. I tried to all kinds of non-medication treatments: tutors, 504 Plan, psychotherapy, meditation, Omega-3, diet, patience, love, encouragement, bribery... everything I could think of, but his grades continued to decline. 
He was finally prescribed 18mg of Concerta. By the end of the 1st week he was acing his tests and his teacher said she finally has a student to teach and not just a body. The change is amazing. Slight decrease in appetite and the first couple of days it affected his sleep. Other than that, no side-effects."