Name: Prazosin HCl
Brand: Selleck Chemicals
SKU: S1424
Availability: InStock
Rating: 5 (8 reviews)

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Quality Control

Batch: Purity: 99.99%

99.99

Related Targets	CXCR Hedgehog/Smoothened PKA AChR 5-HT Receptor Histamine Receptor Dopamine Receptor Ras KRas GPR
Other Adrenergic Receptor Inhibitors	ICI 118551 Hydrochloride (Zenidolol) L755507 Yohimbine HCl Atipamezole Higenamine hydrochloride Noradrenaline bitartrate monohydrate Fenoterol hydrobromide Medetomidine HCl Isoprenaline L-Adrenaline

Solubility

In vitro
Batch:

DMSO : 3 mg/mL (7.14 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Water : Insoluble

Ethanol : Insoluble

Molarity Calculator

Mass	Concentration	Volume	Molecular Weight
Mass value Mass unit	Concentration value Concentration unit	Volume value Volume unit	Molecular weight (g/mol)

Dilution Calculator Molecular Weight Calculator

In vivo batch selection In vivo Batch:
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	5%DMSO 1 40%PEG300 2 5%Tween80 3 50%ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	0.15mg/ml (0.36mM)	Taking the 1 mL working solution as an example, add 50 μL of 3 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 500 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Clear solution	5% DMSO 1 95% Corn oil Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	0.021mg/ml (0.05mM)	Taking the 1 mL working solution as an example, add 50 μL of 0.42 mg/ml clear DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results.

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

Dosage: mg/kg

Average weight of animals: g

Dosing volume per animal: μL

Number of animals:

Step 2: Enter the in vivo formulation (This is only the calculator, not formulation. Please contact us first if there is no in vivo formulation at the solubility Section.)

% DMSO

%

% Tween 80

% ddH₂O

% DMSO

+

%

Calculation results:

Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH₂O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Chemical Information, Storage & Stability

Molecular Weight	419.86	Formula	C₁₉H₂₁N₅O₄·HCl	Storage (From the date of receipt)	3 years-20°Cpowder
CAS No.	19237-84-4	Download SDF		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin solvent
Synonyms	cp-12299-1			SMILES	COC1=C(C=C2C(=C1)C(=NC(=N2)N3CCN(CC3)C(=O)C4=CC=CO4)N)OC.Cl

Read more about storage stability stock solution CAS number SMILES

Mechanism of Action

Targets/IC₅₀/Ki	alpha-adrenergic receptor
In vitro	Prazosin leads to a significant increase in VEGF concentration in endothelial cells and angiogenesis only if eNOS is present. Prazosin binds to the α1-adrenergic receptors that are present on smooth muscle cells surrounding all larger blood vessels. Prazosin (0.1 nM) blocks the increases in perfusion pressure caused by electrical stimulation of the perimesenteric nerves but does not significantly reduce the vasomotor effect of exogenous noradrenaline.
In vivo	Prazosin application leads to the expansion of the capillary system by modulation of the hemodynamic environment (flow rate, shear stress) in skeletal muscle. Prazosin induces angiogenesis in extensor digitorum longus (EDL) muscles of C57BL/6 mice but not eNOS-knockout mice. Prazosin (0.5-2.0 mg/kg) blocks Yohimbine-induced reinstatement of food and alcohol seeking, as well as footshock-induced reinstatement of alcohol seeking in rats. Prazosin (0.2mg kg(-1) s.c.) causes an enhancement of a suppression of conditioned avoidance response in the presence of the dopamine D2 receptor antagonist raclopride (0.05-0.20 mg/kg s.c.) in rats. Prazosin administration alone (1 mg/kg, s.c.) only slightly reduces horizontal activity during an initial 10 min measurement period, although it consistently reduces rearing in freely moving rats. Prazosin effectively suppresses the locomotor stimulation caused by either dose of MK-801 throughout the whole observation period in freely moving rats.
References	[1] https://pubmed.ncbi.nlm.nih.gov/15231496/ [2] https://pubmed.ncbi.nlm.nih.gov/9262332/ [3] https://pubmed.ncbi.nlm.nih.gov/21318567/ [4] https://pubmed.ncbi.nlm.nih.gov/11129112/ [5] https://pubmed.ncbi.nlm.nih.gov/8864686/

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2026-07-06)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT06629090	RECRUITING	Magnetic Resonance Imaging; Cerebrovascular Circulation	University of Wisconsin, Madison	2025-12-17	PHASE2
NCT06629077	RECRUITING	Magnetic Resonance Imaging; Cerebrovascular Circulation	University of Wisconsin, Madison	2026-02-26	PHASE2
NCT04793685	RECRUITING	Alcohol Withdrawal	Yale University	2021-07-01	PHASE2
NCT07231978	COMPLETED	Healthy	Pfizer	2025-11-14	PHASE1
NCT03539614	ACTIVE_NOT_RECRUITING	Posttraumatic Stress Disorder	VA Office of Research and Development	2018-06-04	PHASE3
NCT04721353	COMPLETED	Cannabis Dependence; Posttraumatic Stress Disorder; Cannabis Use Disorder	VA Puget Sound Health Care System	2020-11-09	PHASE4

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Prazosin HCl Adrenergic Receptor antagonist

Chemical Structure

Molecular Weight: 419.86