guanethidine

<chemical> An antihypertensive agent that acts by inhibiting selectively transmission in post-ganglionic adrenergic nerves. It is believed to act mainly by preventing the release of norepinephrine at nerve endings and causes depletion of norepinephrine in peripheral sympathetic nerve terminals as well as in tissues. ... Pharmacological action...
Found on http://www.encyclo.co.uk/local/20973

guanethidine

(gwahn-eth´ĭ-dēn) an adrenergic blocking agent; the monosulfate salt is used as an antihypertensive agent.
Found on http://www.encyclo.co.uk/local/21001
No exact match found