Stimulant - An agent which produces a temporary increase of vital activity in the organism, or in any of its parts.
Amphetamines: methamphetamine - amphetamine used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant (pep pill, speed, upper). Dangerous!
Cocaine - a narcotic (alkaloid) extracted from coca leaves; used as a surface anesthetic or taken for pleasure. Addictive.
Caffeine - a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects; may be added to soft drinks, over-the-counter drugs, etc. Addictive.
Nicotine - A physically addictive, acutely toxic alkaloid that is typically obtained from tobacco leaves. It is used as an insecticide.
Drugs - Stimulants 