Versions of these drugs had been given to World War II radar operators to help them stay awake and focus on boring, repetitive tasks. And when we reviewed the literature on attention-deficit drugs again in 1990 we found that all children, whether they had attention problems or not, responded to stimulant drugs the same way. Moreover, while the drugs helped children settle down in class, they actually increased activity in the playground. Stimulants generally have the same effects for all children and adults. They enhance the ability to concentrate, especially on tasks that are not inherently interesting or when one is fatigued or bored, but they don’t improve broader learning abilities. And just as in the many dieters who have used and abandoned similar drugs to lose weight, the effects of stimulants on children with attention problems fade after prolonged use.
Some experts have argued that children with A.D.D. wouldn’t develop such tolerance because their brains were somehow different. But in fact, the loss of appetite and sleeplessness in children first prescribed attention-deficit drugs do fade, and, as we now know, so do the effects on behavior. They apparently develop a tolerance to the drug, and thus its efficacy disappears. Many parents who take their children off the drugs find that behavior worsens, which most likely confirms their belief that the drugs work. But the behavior worsens because the children’s bodies have become adapted to the drug. Adults may have similar reactions if they suddenly cut back on coffee, or stop smoking.
