Adderall is a combination of amphetamine and dextroamphetamine, both of which are stimulants that affect the central nervous system. This means that it increases the levels of dopamine and norepinephrine in the brain, leading to increased alertness, concentration, and energy. While this may sound appealing to students cramming for exams or professionals working long hours, the use of Adderall without a prescription and proper medical supervision can have serious consequences.