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Showing 1–24 of 71 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Prazosin Hydrochloride Clear all
Completed Phase 1 Interventional Accepts healthy volunteers

DOX as a Potential Treatment for Methamphetamine Dependence

NCT02785393
View directory record Official record
Conditions
Substance-Related Disorders
Interventions
Sugar Pill, Doxazosin
Drug
Lead sponsor
Baylor College of Medicine
Other
Eligibility
18 Years to 55 Years
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2016
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Sep 28, 2016 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Phase 4 Interventional

Prazosin Alcohol Dependence IVR Study

NCT00167687
View directory record Official record
Conditions
Alcoholism
Interventions
prazosin
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Feb 14, 2008 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Phase 4 Interventional

Reducing Cannabis Overuse With Prazosin

NCT04721353
View directory record Official record
Conditions
Cannabis Dependence, Posttraumatic Stress Disorder, Cannabis Use Disorder
Interventions
Prazosin Hydrochloride
Drug
Lead sponsor
VA Puget Sound Health Care System
Federal
Eligibility
18 Years to 80 Years
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2025
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jun 14, 2025 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Phase 1 Interventional

The Effects of Doxazosin on the Cardiovascular and Subjective Effects of Cocaine

NCT01062945
View directory record Official record
Conditions
Cocaine Addiction, Cocaine Abuse, Cocaine Dependence, Substance Abuse
Interventions
Placebo, Doxazosin
Drug
Lead sponsor
Baylor College of Medicine
Other
Eligibility
18 Years to 55 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 26, 2012 · Synced Sep 17, 2026, 10:39 PM EDT
Active, not recruiting Phase 2 Interventional

Alpha-1 Blockade for Alcohol Use Disorder (AUD)

NCT04135846
View directory record Official record
Conditions
Alcohol Use Disorder (AUD)
Interventions
Doxazosin, Placebo
Drug
Lead sponsor
Brown University
Other
Eligibility
18 Years and older
Enrollment
184 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Sep 13, 2026 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Phase 2 Interventional Results available

Testing Doxazosin to Treat Stress Mechanisms in Alcoholism

NCT02989493
View directory record Official record
Conditions
Alcoholism
Interventions
Doxazosin, Placebo
Drug · Other
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 65 Years
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Mar 17, 2021 · Synced Sep 17, 2026, 10:39 PM EDT
Not listed Not applicable Interventional

Feasibility Study: The Effect of Prazosin for Nighttime Symptoms of Civilian PTSD

NCT00174551
View directory record Official record
Conditions
Stress Disorders, Post-Traumatic
Interventions
prazosin
Drug
Lead sponsor
Rainier Associates
Other
Eligibility
18 Years to 80 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2005
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Sep 10, 2006 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Chronic Postconcussive Headache: A Placebo-Controlled Treatment Trial of Prazosin

NCT02266329
View directory record Official record
Conditions
Posttraumatic Headache, Combat Disorders, Post Concussion Syndrome, Headache, Mild Traumatic Brain Injury, Posttraumatic Migraine
Interventions
prazosin hydrochloride, placebo
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years and older
Enrollment
89 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2023
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Mar 29, 2026 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Phase 4 Interventional Results available

Effect of Beta-blockers on Structural Remodeling and Gene Expression in the Failing Human Heart

NCT01798992
View directory record Official record
Conditions
Idiopathic Dilated Cardiomyopathy
Interventions
Carvedilol, Metoprolol succinate, Metoprolol succinate + doxazosin
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years and older
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2009
U.S. locations
2
States / cities
Denver, Colorado • Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Nov 28, 2023 · Synced Sep 17, 2026, 10:39 PM EDT
Recruiting Phase 2 Interventional

Prazosin for Alcohol Use Disorder With Withdrawal Symptoms

NCT04793685
View directory record Official record
Conditions
Alcohol Withdrawal
Interventions
Prazosin, 12-Step Facilitation with Relapse Prevention and Contingency Management
Drug · Behavioral
Lead sponsor
Yale University
Other
Eligibility
18 Years to 70 Years
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Dec 10, 2025 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Not applicable Interventional Results available

Efficacy of Sleep Interventions for Posttraumatic Stress Disorder (PTSD)

NCT00393874
View directory record Official record
Conditions
Anxiety Disorders, Mood Disorders, Insomnia, Nightmares
Interventions
Behavioral Sleep Intervention, Prazosin, Placebo
Behavioral · Drug
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years to 55 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2011
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 23, 2016 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Phase 1 Interventional Results available

The Efficacy of Doxazosin for Cocaine Users

NCT00880997
View directory record Official record
Conditions
Cocaine Dependence
Interventions
Doxazosin, Placebo
Drug · Other
Lead sponsor
Baylor College of Medicine
Other
Eligibility
18 Years to 64 Years
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 21, 2019 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Phase 1 Interventional

Treatment of Supine Hypertension in Autonomic Failure

NCT00223717
View directory record Official record
Conditions
Hypertension
Interventions
Clonidine, Nitroglycerin transdermal, Dipyridamole/ Aspirin (Aggrenox), Desmopressin (DDAVP), Sildenafil, Nifedipine, Hydralazine, Hydrochlorothiazide, Placebo, Bosentan, Diltiazem, Eplerenone, guanfacine, L-arginine, captopril, carbidopa, losartan, metoprolol tartrate, nebivolol hydrochloride, prazosin hydrochloride, tamsulosin hydrochloride, Head-up tilt., aliskiren, Local heat stress
Drug · Dietary Supplement · Other
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 80 Years
Enrollment
152 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2017
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 12, 2017 · Synced Sep 17, 2026, 10:39 PM EDT
Withdrawn Not applicable Interventional

Effect of Prazosin on Neurophysiology and Cognition in Post-Traumatic Stress Disorder (PTSD)

NCT00890643
View directory record Official record
Conditions
Posttraumatic Stress Disorder
Interventions
prazosin hydrochloride, placebo
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
18 Years to 65 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 22, 2013 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Phase 2 Interventional Results available

CAP: Doxazosin in the Treatment of Co-Occurring PTSD and Alcohol Use Disorders

NCT02500602
View directory record Official record
Conditions
Posttraumatic Stress Disorder, Alcohol Use Disorders
Interventions
doxazosin, placebo
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
Not listed
Enrollment
144 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated May 12, 2021 · Synced Sep 17, 2026, 10:39 PM EDT
Completed No phase listed Observational

Mechanisms of Increased Ambulatory Blood Pressure in Patients With Intradialytic Hypertension

NCT01862497
View directory record Official record
Conditions
Intradialytic Hypertension
Interventions
Carvedilol vs. Prazosin
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
76 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Apr 30, 2018 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Not applicable Interventional Results available

Augmentation Trial of Prazosin for Post-Traumatic Stress Disorder (PTSD)

NCT00990106
View directory record Official record
Conditions
Stress Disorders, Post-Traumatic, Combat Disorders, Sleep Disorders
Interventions
prazosin hydrochloride, placebo
Drug
Lead sponsor
Seattle Institute for Biomedical and Clinical Research
Other
Eligibility
18 Years and older
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
2
States / cities
Seattle, Washington • Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated May 22, 2018 · Synced Sep 17, 2026, 10:39 PM EDT
Recruiting Phase 2 Interventional Accepts healthy volunteers

Brain Blood Vessel Responses to Changes in Blood Flow

NCT06629077
View directory record Official record
Conditions
Magnetic Resonance Imaging, Cerebrovascular Circulation
Interventions
MRI, Prazosin, Placebo
Device · Drug
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
55 Years to 69 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Sep 14, 2026 · Synced Sep 17, 2026, 10:39 PM EDT
Not listed Phase 2 Interventional

A Randomized Controlled Trial of Doxazosin for Nightmares, Sleep Disturbance, and Non-Nightmare Clinical Symptoms in PTSD

NCT03339258
View directory record Official record
Conditions
Stress Disorders, Post-Traumatic
Interventions
Doxazosin Mesylate, Extended Release, Placebo
Drug
Lead sponsor
San Francisco Veterans Affairs Medical Center
Federal
Eligibility
18 Years to 75 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Apr 30, 2024 · Synced Sep 17, 2026, 10:39 PM EDT
Terminated Not applicable Interventional Results available

Prazosin for Treating Noncombat Trauma Post-Traumatic Stress Disorder

NCT00183430
View directory record Official record
Conditions
Post-Traumatic Stress Disorder, Sleep Initiation and Maintenance Disorders
Interventions
Prazosin, Placebo, Psychotherapy
Drug · Behavioral
Lead sponsor
Seattle Institute for Biomedical and Clinical Research
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2010
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jun 13, 2018 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Phase 4 Interventional Results available

Prazosin for Post-Concussive Headaches

NCT02965027
View directory record Official record
Conditions
Post-Traumatic Headache
Interventions
Prazosin, Placebo
Drug
Lead sponsor
Seattle Institute for Biomedical and Clinical Research
Other
Eligibility
18 Years and older
Enrollment
89 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2023
U.S. locations
2
States / cities
Seattle, Washington • Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Jul 9, 2024 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Not applicable Interventional Results available

Alzheimer's in Long-Term Care--Treatment for Agitation

NCT00161473
View directory record Official record
Conditions
Alzheimer Disease, Psychomotor Agitation
Interventions
prazosin, placebo (inert substance)
Drug
Lead sponsor
University of Washington
Other
Eligibility
Not listed
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2009
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Aug 1, 2012 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Not applicable Interventional

Prazosin vs. Paroxetine in Combat Stress Symptoms in OIF/OEF Returnees

NCT00261729
View directory record Official record
Conditions
Sleep Disorders, Stress Disorders, Post-Traumatic
Interventions
Paroxetine, Prazosin, placebo
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
18 Years to 50 Years
Enrollment
210 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2009
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Dec 2, 2009 · Synced Sep 17, 2026, 10:39 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Prazosin and Naltrexone (PaN) Study for Veterans With Alcohol Use Disorders

NCT02322047
View directory record Official record
Conditions
Alcohol Use Disorder, Posttraumatic Stress Disorder (PTSD)
Interventions
Prazosin, Naltrexone, Placebo (Prazosin), Placebo (Naltrexone)
Drug
Lead sponsor
Seattle Institute for Biomedical and Clinical Research
Other
Eligibility
18 Years to 80 Years
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2018
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Dec 28, 2020 · Synced Sep 17, 2026, 10:39 PM EDT