Stimulants - are drugs hat speed up the activity of the central nervous system. Stimulants are useful in treating many medical conditions, including ADHD, narcolepsy, asthma, obesity, and depression. There are several types of stimulants, including caffeine, nicotine, cocaine, amphetamines, and methamphetamines.
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This section on STIMULANTS covers various issues so please visit the relevant subsections.