Stimulant

Serving to stimulate.

Produced increased vital action in the organism, or in any of its parts.

That which stimulates, provokes, or excites.

An agent which produces a temporary increase of vital activity in the organism, or in any of its parts; -- sometimes used without qualification to signify an alcoholic beverage used as a stimulant.

a drug that temporarily quickens some vital process

any stimulating information or event; acts to arouse action