Independent directory Public ClinicalTrials.gov records United States
Clinical Trials Finder
Objective public record navigation
Search Results

Search by objective public record fields.

Search by query text, NCT ID, condition, intervention, sponsor, city, state, recruitment status, phase, study type, healthy volunteer eligibility, sex, or age. Results are retrieved from ClinicalTrials.gov and synchronized into the directory. Search pages remain noindex by default.

Clear filters
ClinicalTrials.gov public records Last synced Sep 1, 2026, 7:48 PM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 1–24 of 71 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Intervention: prazosin hydrochloride Clear all
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Pivotal Bioequivalence Study to Qualify Manufacturing Site Transfer for Prazosin Hydrochloride Capsules

NCT04967443
View directory record Official record
Conditions
Hypertension, Heart Failure
Interventions
Prazosin HCl 2mg, Prazosin HCl 1 mg, Prazosin HCl 5 mg
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 55 Years
Enrollment
72 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Jul 11, 2024 · Synced Sep 1, 2026, 7:48 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 1, 2026, 7:48 PM EDT
Completed Phase 4 Interventional Results available

Black Education and Treatment of Hypertension (BEAT HTN)

NCT00661895
View directory record Official record
Conditions
Hypertension
Interventions
Hydrochlorothiazide, Lisinopril, Lisinopril and Hydrochlorothiazide, Nifedipine XL, Metoprolol tartrate, Atenolol, Valsartan, Doxazosin, Clonidine, Hydralazine, Metoprolol succinate, Amlodipine
Drug
Lead sponsor
Creighton University
Other
Eligibility
25 Years to 80 Years
Enrollment
99 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2009
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Dec 3, 2012 · Synced Sep 1, 2026, 7:48 PM EDT
Terminated Phase 4 Interventional Results available

Prazosin and Cerebrospinal Fluid (CSF) Biomarkers in Mild Traumatic Brain Injury (mTBI)

NCT03221751
View directory record Official record
Conditions
Dementia
Interventions
prazosin hydrochloride, placebo
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
21 Years and older
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2023
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Feb 25, 2024 · Synced Sep 1, 2026, 7:48 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 1, 2026, 7:48 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 1, 2026, 7:48 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 1, 2026, 7:48 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Monoamine Antagonist Therapies for Methamphetamine Abuse Prazosin

NCT01178138
View directory record Official record
Conditions
Continuous Methamphetamine Abuse
Interventions
Prazosin
Drug
Lead sponsor
University of Arkansas
Other
Eligibility
18 Years to 50 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2013
U.S. locations
1
States / cities
Little Rock, Arkansas
Source: ClinicalTrials.gov public record
Updated Dec 29, 2016 · Synced Sep 1, 2026, 7:48 PM EDT
Completed Phase 1 Interventional

DOXAZOSIN FOR PTSD

NCT02308202
View directory record Official record
Conditions
PTSD
Interventions
doxazosin, Perindopril, Placebo
Drug
Lead sponsor
Baylor College of Medicine
Other
Eligibility
18 Years to 55 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Apr 25, 2022 · Synced Sep 1, 2026, 7:48 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

Medical Therapy of Prostatic Symptoms

NCT00021814
View directory record Official record
Conditions
Prostatic Hyperplasia, Prostatic Hypertrophy, Benign
Interventions
Doxazosin, Finasteride, Doxazosin placebo, Finasteride placebo
Drug
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
50 Years and older · Male only
Enrollment
3,407 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1995 – 2001
U.S. locations
17
States / cities
La Jolla, California • Aurora, Colorado • New Haven, Connecticut + 13 more
Source: ClinicalTrials.gov public record
Updated Sep 27, 2018 · Synced Sep 1, 2026, 7:48 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 1, 2026, 7:48 PM EDT
Completed Early Phase 1 Interventional

Varenicline + Prazosin for Heavy Drinking Smokers

NCT02193256
View directory record Official record
Conditions
Cigarette Smoking, Alcohol Use Disorders
Interventions
Varenicline, Prazosin, Placebo
Drug
Lead sponsor
Yale University
Other
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 11, 2020 · Synced Sep 1, 2026, 7:48 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 1, 2026, 7:48 PM EDT
Completed Phase 1 Interventional

Complementary Combination Therapy for Cocaine Dependence

NCT02538744
View directory record Official record
Conditions
Cocaine Dependence
Interventions
Doxazosin, Modafinil, cocaine, Placebo
Drug
Lead sponsor
Baylor College of Medicine
Other
Eligibility
18 Years to 55 Years
Enrollment
45 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Apr 25, 2022 · Synced Sep 1, 2026, 7:48 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 Mar 1, 2026 · Synced Sep 1, 2026, 7:48 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 1, 2026, 7:48 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 1, 2026, 7:48 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Effectiveness of Prazosin on the Urinary Sodium Excretion Response to Mental Stress

NCT02431936
View directory record Official record
Conditions
Hypertension, Stress, Psychological, Blood Pressure
Interventions
Prazosin, Placebo
Drug
Lead sponsor
Augusta University
Other
Eligibility
18 Years to 50 Years
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2019
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 19, 2019 · Synced Sep 1, 2026, 7:48 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 1, 2026, 7:48 PM EDT
Completed Phase 2 Interventional Results available

Prazosin for Alcohol Dependence and Posttraumatic Stress Disorder

NCT01518972
View directory record Official record
Conditions
Alcohol Abuse, Posttraumatic Stress Disorder
Interventions
Prazosin, Placebo medication
Drug
Lead sponsor
Seattle Institute for Biomedical and Clinical Research
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Aug 24, 2020 · Synced Sep 1, 2026, 7:48 PM EDT
Completed Not applicable Interventional Results available

Orthostatic Hypotension Treatment on Rehab Unit

NCT01030874
View directory record Official record
Conditions
Orthostatic Hypotension, Falls
Interventions
Medication review, Nutrition/Salt intake, Education, Exercise, Drug Recommendations
Other
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years to 99 Years
Enrollment
356 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jun 30, 2021 · Synced Sep 1, 2026, 7:48 PM EDT
Completed No phase listed Observational

ACEI or ARB and COVID-19 Severity and Mortality in US Veterans

NCT04467931
View directory record Official record
Conditions
Hypertension, COVID
Interventions
ACEI/ARB, Non-ACEI/ARB, ACEI, ARB
Drug
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
22,213 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Apr 27, 2021 · Synced Sep 1, 2026, 7:48 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 1, 2026, 7:48 PM EDT
Terminated Not applicable Interventional Results available

Prazosin vs Paroxetine in Combat Stress-Related Post-Traumatic Stress Disorder (PTSD) Nightmares & Sleep Disturbance

NCT00202449
View directory record Official record
Conditions
Stress Disorders, Post-Traumatic, Sleep Disorders
Interventions
prazosin, paroxetine, Placebo
Drug
Lead sponsor
Seattle Institute for Biomedical and Clinical Research
Other
Eligibility
18 Years to 50 Years
Enrollment
59 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2008
U.S. locations
2
States / cities
Washington D.C., District of Columbia • Fort Lewis, Washington
Source: ClinicalTrials.gov public record
Updated Jul 9, 2018 · Synced Sep 1, 2026, 7:48 PM EDT