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Skeletal formula of guanethidine
Ball-and-stick model of the guanethidine molecule
Clinical data
AHFS/Drugs.comMicromedex Detailed Consumer Information
ATC code
Pharmacokinetic data
Elimination half-life1.5 days
CAS Number
PubChem CID
E number{{#property:P628}}
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Chemical and physical data
Molar mass198.309 g/mol
3D model (JSmol)
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List of terms related to Guanethidine

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


Guanethidine is an antihypertensive drug that reduces the release of catecholamines, such as norepinephrine. Guanethidine is transported across the sympathetic nerve membrane by the same mechanism that transports norepinephrine itself (NET, uptake 1), and uptake is essential for the drug's action. Once guanethidine has entered the nerve, it is concentrated in transmitter vesicles, where it replaces norepinephrine.It may also inhibit the release of granules by decreasing norepinephrine.

Side effects

Side effects include orthostatic and exercise hypotension, sexual dysfunction (delayed or retrograde ejaculation), and diarrhea.


Guanethidine is transported by uptake 1 into the presynaptic terminal transported by Norepinephrine transporter (NET). (In this it competes with norepinephrine so can potentiate exogenously applied norepinephrine.) It becomes concentrated in norepinephrine transmitter vesicles, replacing norepinephrine in these vesicles. This leads to a gradual depletion of norepinephrine stores in the nerve endings. Once inside the terminal it blocks the release of norepinephrine in response to arrival of an action potential. Spontaneous release is not affected.


Guanethidine was once a mainstay for hypertension resistant to other agents, and was often used safely during pregnancy, but it is no longer used in the US due to lack of availability. It is still licensed in some countries, e.g., UK, for the rapid control of blood pressure in a hypertensive emergency.

Intravenous nerve block (Bier block) using guanethidine has been used to treat chronic pain caused by complex regional pain syndrome.[1]

Chemical synthesis

Guanethidine is synthesized beginning with the alkylation of azocine with chloroacetonitrile. This reaction which forms 1-azocinylacetonitrile, which can be reduced into 1-(2-aminoethyl)azocine by using lithium aluminium hydride as a reductant. This compound reacts with S-methylthiourea forming guanethidine.[2][3][4]


  1. Joyce PI, Rizzi D, Caló G, Rowbotham DJ, Lambert DG (November 2002). "The effect of guanethidine and local anesthetics on the electrically stimulated mouse vas deferens". Anesth. Analg. 95 (5): 1339–43, table of contents. doi:10.1097/00000539-200211000-00045. PMID 12401623.
  2. R.P. Mull, Template:US Patent (1960)
  3. R.P. Mull, Template:US Patent (1961)
  4. R.P. Mull, Template:US Patent (1962)

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