1) Antihypertensive 2) Antihypertensive drug 3) Clonidine 1) Clonidine 
A drug used to treat high blood pressure. It is also being studied in the treatment of certain types of cancer pain. It blocks the release of chemicals from nerve endings that make blood vessels constrict (get narrower). Catapres is a type of antihypertensive agent and a type of alpha-adrenergic agonist. Also called clonidine hydrochloride.
(kat´ә-pres) trademark for preparations of clonidine hydrochloride, an antihypertensive agent and analgesic.