Adderall is a brand name for a drug that has a combination of four amphetamine salts. Two different substances i.e. amphetamine and dextroamphetamine. Also, the drug class of the substance is stimulants belonging to the Schedule II controlled substance. The drug stimulates the central nervous system which increases certain brain chemicals. These chemicals like dopamine, serotonin, and norepinephrine. So, these brain chemicals increase focus, concentration, and cognitive functions and decrease inattentiveness and hyperactivity.