Premise: 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 .
Hypothesis: Levoamphetamine improves the ability to stay conscious and awake.
Label: ENTAILMENT