Clonidine is a centrally acting antihypertensive (to lower high blood pressure) agent, used mainly for this purpose in the past. It has found new uses, including treatment of some types of neuropathic pain, opioid detoxification, and, off-label, to counter the side effects of stimulant medication such as Methylphenidate.

GoldBamboo

... CLONIDINE (Catapres®) is an antihypertensive. Clonidine relaxes blood vessels, relieving high blood pressure (hypertension). It is not a cure and has to be taken regularly. Untreated high blood pressure can cause a stroke, heart failure, or damage to your kidneys. Clonidine can be used to treat conditions other than hypertension, as determined by your health care professional. Generic clonidine tablets are available. ...
Drug Digest - more...

Clonidine Systematic (IUPAC) name N-(2,6-dichlorophenyl)-4,5-dihy ...
Wikipedia - [full article]

Resources