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Amphetamine (USAN) or amfetamine (INN) is a psychostimulant drug that is known to produce increased wakefulness and focus in association with decreased fatigue and appetite. Amphetamine is chemically related to methamphetamine and lisdexamfetamine, a class of potent drugs that act by increasing levels of dopamine and norepinephrine in the brain, inducing euphoria. The class includes prescription CNS drugs commonly used to treat attention-deficit hyperactivity disorder (ADHD). It is also used to treat symptoms of traumatic brain injury (TBI) and the daytime drowsiness symptoms of narcolepsy, postural orthostatic tachycardia syndrome (POTS) and chronic fatigue syndrome (CFS). Initially, amphetamine was more popularly used to diminish the appetite and to control weight. Brand names of the drugs that contain, or metabolize into, amphetamine include Adderall, Vyvanse, and Dexedrine, as well as Benzedrine in the past.