premise: Levoamphetamine is a stimulant.
hypothesis: Adderall . By salt content , the active ingredients of Adderall are 25 % levoamphetamine salts ( the levorotary or ` left-handed ' enantiomer ) and 75 % dextroamphetamine salts ( the dextrorotary or ` right-handed ' enantiomer ) . The two amphetamine enantiomers that compose Adderall ( i.e. , levoamphetamine and dextroamphetamine ) alleviate the symptoms of ADHD and narcolepsy by increasing the activity of the neurotransmitters norepinephrine and dopamine in the brain , which results from their interactions with trace amine associated receptor 1 ( TAAR1 ) and vesicular monoamine transporter 2 ( VMAT2 ) in neurons . Amphetamine ( contracted from ) is a potent central nervous system ( CNS ) stimulant that is used in the treatment of attention deficit hyperactivity disorder ( ADHD ) , narcolepsy , and obesity . Amphetamine properly refers to a specific chemical , the racemic free base , which is equal parts of the two enantiomers , levoamphetamine and dextroamphetamine , in their pure amine forms . Levoamphetamine , also known as levamfetamine ( INN ) , ( R ) - amphetamine , - amphetamine , and L-amphetamine , is a central nervous system ( CNS ) stimulant known to increase wakefulness and concentration in association with decreased appetite and fatigue .