Excitant

a.	1.	Tending to excite; exciting.
n.	1.	(Physiol.) An agent or influence which arouses vital activity, or produces increased action, in a living organism or in any of its tissues or parts; a stimulant.

Adj.

1.

excitant - (of drugs e.g.) able to excite or stimulate Synonyms: excitative, excitatory

excitative, excitatory, stimulative