Phentermine is a stimulant and appetite suppressant. Caffeine is a central nervous system stimulant that reduces fatigue and drowsiness. These compounds are sympathomimetics with stimulant and decongestant qualities and are chemically substituted amphetamines. It works as an appetite suppressant likely as a result of being a CNS stimulant. It is chewed for its stimulant and psychoactive effects. The herb is purported to be a diaphoretic, astringent, tonic, stimulant and mild aromatic. Another stimulant, amphetamine, promotes increased dopamine from the synaptic vesicles. Nevertheless, it is a potent CNS stimulant and dopamine reuptake inhibitor. Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. Dynorphin has been implicated as an appetite stimulant. Cocaine is a powerful nervous system stimulant. However, an alternate atomic arrangement gives dextromethamphetamine, which is a stronger stimulant than amphetamine. Okwe keeps himself awake by chewing khat, a herbal stimulant. Both men talked about ADHD and stimulant drugs. Topics include ADHD's causes and the use of stimulant medications in its treatment.