Curious as to why can't people just take Adderall (dextroamphetamine and racemic amphetamine) everyday?

If you have ADD/ADHD. With good response to Adderall (dextroamphetamine and racemic amphetamine) it is actually recommended that it be taken daily. The brain does not like to be treated like a ping pong ball. In other words, the brain likes consistency - not drug changes day to day.