A
stimulant is a general term used to describe a substance that can
temporarily quicken a functional activity or the activity of an organ
in the body. Stimulants are relatively common compounds ranging from
caffeine, which can be found in drinks such as coffee, as well as OTC
medicines, through to recreational drugs such as amphetamine, cocaine,
etc. A further example, adrenalin, is a heart stimulant and the
stimulant caffeine affects the central nervous system, being able to
temporarily raise alertness. Stimulants can also be used to suppress
appetite.
