Stimulants are drugs that act on the brain to speed up vital processes (heart and respiration) in cases of shock and collapse. They also increase alertness and inhibit hyperactive behavior in children. High doses can produce restlessness, insomnia, and hypertension. Examples of stimulants are amphetamines—used to prevent narcolepsy (seizures of sleep), to suppress appetite, and to calm hyperkinetic children. Caffeine also is a cerebral stimulant. It is used in drugs to relieve certain types of headache by constricting cerebral blood vessels.
Examples of stimulants are given below:
Dextroamphetamine sulfate (Dexedrine)
Dextroamphetamine and amphetamine (Adderall)