The stereotypical medicated kid in America is wealthy and spoiled and retains a psychiatrist to guarantee him extra time on tests or to help process the emotional fallout of being neglected by high-powered working parents. In this formulation, rich kids have psychological problems, and poor kids have real problems. But the stereotype isn’t accurate; the correlation is, in fact, the opposite. Children in poor families are significantly more likely to be diagnosed with emotional and behavioral problems.

Source: Misunderstanding Medicated Kids — Pacific Standard