Prazosin hydrochloride

≥99.0% (HPLC)

1-(4-Amino-6,7-dimethoxy-2-quinazolinyl)-4-(2-furanylcarbonyl)piperazine hydrochloride, Furazosin hydrochloride
Empirical Formula (Hill Notation):
C19H21N5O4 · HCl
CAS Number:
Molecular Weight:
Beilstein/REAXYS Number:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level


≥99.0% (HPLC)


H2O: 0.5 mg/mL
methanol: 6 mg/mL
dilute aqueous acid: insoluble



SMILES string




InChI key


Gene Information

human ... ADRA1A(148), ADRA1B(147), ADRA1D(146)

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General description

Prazosin is a member of the class of α-adrenergic blockers. It is considered as a peripheral vasodilator antihypertensive agent. Prazosin is a derivative of quinazoline.


Prazosin hydrochloride has been used:
  • to block the α1adrenergic receptors that mediate sympathetic vasoconstriction in mice
  • as an α1-adrenoceptor blocker,administered intragastrically in rats
  • as a vasodilator,administered together with inuslin into the left ventricle of mice for the assessment of its effects on renal functions

Biochem/physiol Actions

Peripheral α1-adrenoceptor antagonist; vasodilator. Prazosin can be used to treat chronic posttraumatic stress disorder (PTSD). It plays a role in reducing blood pressure by relaxing blood vessels, hence used in the treatment of high blood pressure.

Features and Benefits

This compound is featured on the α1-Adrenoceptors, α2-Adrenoceptors and Melatonin Receptors pages of the Handbook of Receptor Classification and Signal Transduction. To browse other handbook pages, click here.
This compound is a featured product for ADME Tox and Neuroscience research. Discover more featured ADME Tox and Neuroscience products. Learn more about bioactive small molecules for other areas of research at sigma.com/discover-bsm.
This compound is also offered as part of Sigma′s Library of Pharmacologically Active Compounds (LOPAC®1280), a biologically annotated collection of high-quality, ready-to-screen compounds. Click here to learn more.


Bottomless glass bottle. Contents are inside inserted fused cone.


Hygroscopic; light sensitive.

Legal Information

LOPAC is a registered trademark of Sigma-Aldrich Co. LLC


Exclamation markHealth hazard

Signal Word


Hazard Statements

Target Organs

Central nervous system

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Murray A Raskind et al.
The American journal of psychiatry, 170(9), 1003-1010 (2013-07-13)
The authors conducted a 15-week randomized controlled trial of the alpha-1 adrenoreceptor antagonist prazosin for combat trauma nightmares, sleep quality, global function, and overall symptoms in active-duty soldiers with posttraumatic stress disorder (PTSD) returned from combat deployments to Iraq and...
Enhanced salt sensitivity following shRNA silencing of neuronal TRPV1 in rat spinal cord
Yu S Q and Wang D H
Acta Pharmacologica Sinica, 32(6), 845-845 (2011)
Haptoglobin reduces renal oxidative DNA and tissue damage during phenylhydrazine-induced hemolysis
Lim Y K, et al.
Kidney International, 58(3), 1033-1044 (2000)
Stal Saurav Shrestha et al.
Journal of nuclear medicine : official publication, Society of Nuclear Medicine, 55(1), 141-146 (2014-01-05)
The PET radioligand (11)C-CUMI-101 was previously suggested as a putative agonist radioligand for the serotonin 1A (5-hydroxytryptamine 1A [5-HT1A]) receptor in recombinant cells expressing human 5-HT1A receptor. However, a recent study showed that CUMI-101 behaved as a potent 5-HT1A receptor...
Prazosin in the treatment of PTSD
Green, Ben
Journal of Psychiatric Practice, 20(4), 253-259 (2014)
Review alpha 1 adrenoceptors as well as their agonists, antagonists, and tissue expression patterns. We suggest several modulators and alternatives for working with a-1 adrenoreceptors.
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