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ClinicalTrials.gov public records Last synced Oct 17, 2026, 11:09 AM EDT

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Showing 1–24 of 74 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Prazosin Clear all
Completed Phase 1Phase 2 Interventional Results available

Prazosin to Reduce Stress-Induced Alcohol/Drug Craving and Relapse

NCT00585780
View directory record Official record
Conditions
Alcohol Dependence
Interventions
Prazosin Tablet, Placebo Tablet
Drug
Lead sponsor
Yale University
Other
Eligibility
18 Years to 70 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2019
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Jul 27, 2020 · Synced Oct 17, 2026, 11:09 AM EDT
Completed Phase 3 Interventional Results available

Preoperative Alpha Blockade for Pheochromocytoma

NCT03176693
View directory record Official record
Conditions
Pheochromocytoma, Paraganglioma
Interventions
Phenoxybenzamine, Doxazosin
Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2021
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Nov 20, 2023 · Synced Oct 17, 2026, 11:09 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Optimal Duration of Indwelling Urinary Catheter Following Pelvic Surgery

NCT01923129
View directory record Official record
Conditions
Urinary Retention
Interventions
Prazosin given 6 hours prior to catheter removal in the 24 hour group
Drug
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
18 Years and older
Enrollment
142 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2017
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Feb 20, 2019 · Synced Oct 17, 2026, 11:09 AM EDT
Completed Not applicable Interventional Results available

Prazosin Augmentation of Outpatient Treatment of Alcohol Use Disorders in Active Duty Soldiers With and Without PTSD

NCT02226367
View directory record Official record
Conditions
Alcohol Use Disorders, Stress Disorders, Posttraumatic, Combat Disorders
Interventions
prazosin hydrochloride, placebo
Drug
Lead sponsor
Seattle Institute for Biomedical and Clinical Research
Other
Eligibility
21 Years and older
Enrollment
158 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Feb 3, 2023 · Synced Oct 17, 2026, 11:09 AM 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 26, 2024 · Synced Oct 17, 2026, 11:09 AM EDT
Completed Phase 2 Interventional Results available

Prazosin for Agitation in Alzheimer's Disease

NCT03710642
View directory record Official record
Conditions
Alzheimer's Disease, Disruptive Behavior
Interventions
Prazosin, Placebo oral capsule
Drug
Lead sponsor
Alzheimer's Disease Cooperative Study (ADCS)
Other
Eligibility
Not listed
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
14
States / cities
Sun City, Arizona • Los Angeles, California • San Diego, California + 10 more
Source: ClinicalTrials.gov public record
Updated Feb 6, 2023 · Synced Oct 17, 2026, 11:09 AM 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 12, 2020 · Synced Oct 17, 2026, 11:09 AM 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 30, 2026 · Synced Oct 17, 2026, 11:09 AM EDT
Completed Not applicable Interventional Results available

A Policy Relevant US Trauma Care System Pragmatic Trial for PTSD and Comorbidity

NCT02655354
View directory record Official record
Conditions
Posttraumatic Stress Disorder, Depression, Alcohol-Related Disorders, Suicidal Ideation, Substance-Related Disorders, Mild Cognitive Impairment, Quality of Life, Pain, Wounds and Injury, Brain Injuries, Chronic Disease
Interventions
Motivational Interviewing, Cognitive Behavioral Therapy Elements, Care Management, Fluoxetine, Fluvoxamine, Paroxetine, Sertraline, Citalopram, Venlafaxine, Duloxetine, Mirtazapine, Diphenhydramine, Trazodone, Prazosin
Behavioral · Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
635 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
24
States / cities
Scottsdale, Arizona • Beverly Hills, California • Sacramento, California + 20 more
Source: ClinicalTrials.gov public record
Updated Jul 2, 2021 · Synced Oct 17, 2026, 11:09 AM 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 28, 2018 · Synced Oct 17, 2026, 11:09 AM 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 10, 2024 · Synced Oct 17, 2026, 11:09 AM EDT
Withdrawn Phase 1 Interventional Accepts healthy volunteers

The Acute Cardiovascular Effects of Nicotine in E-cigarettes (ACE) Study

NCT03010995
View directory record Official record
Conditions
Cigarette Smoking Toxicity, Nicotine, Acute Cardiovascular Disease
Interventions
Prazosin
Drug
Lead sponsor
University of Louisville
Other
Eligibility
18 Years to 40 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2018
U.S. locations
1
States / cities
Louisville, Kentucky
Source: ClinicalTrials.gov public record
Updated Jul 26, 2018 · Synced Oct 17, 2026, 11:09 AM 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 20, 2019 · Synced Oct 17, 2026, 11:09 AM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Cooperative Studies Program #563 - Prazosin and Combat Trauma PTSD

NCT00532493
View directory record Official record
Conditions
PTSD, Sleep Disorders
Interventions
prazosin, placebo
Drug · Other
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years and older
Enrollment
304 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
15
States / cities
Loma Linda, California • Long Beach, California • Palo Alto, California + 12 more
Source: ClinicalTrials.gov public record
Updated May 1, 2018 · Synced Oct 17, 2026, 11:09 AM 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 2, 2012 · Synced Oct 17, 2026, 11:09 AM EDT
Completed 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
152 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Sep 30, 2026 · Synced Oct 17, 2026, 11:09 AM 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 Jul 1, 2021 · Synced Oct 17, 2026, 11:09 AM 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 28, 2021 · Synced Oct 17, 2026, 11:09 AM 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 24, 2016 · Synced Oct 17, 2026, 11:09 AM 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 22, 2019 · Synced Oct 17, 2026, 11:09 AM EDT
Completed Phase 2 Interventional Results available

Study of the Medication Prazosin for Alcohol Dependence

NCT00762710
View directory record Official record
Conditions
Alcoholism
Interventions
Prazosin medication, Placebo medication
Drug
Lead sponsor
Seattle Institute for Biomedical and Clinical Research
Other
Eligibility
18 Years and older
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2014
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jun 4, 2020 · Synced Oct 17, 2026, 11:09 AM 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 15, 2026 · Synced Oct 17, 2026, 11:09 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Hemodynamic Study of Avanafil and Two α-Adrenergic Blockers,Doxazosin and Tamsulosin

NCT01100021
View directory record Official record
Conditions
Erectile Dysfunction
Interventions
Tamsulosin and avanafil, Doxazosin and avanafil
Drug
Lead sponsor
VIVUS LLC
Industry
Eligibility
40 Years to 65 Years · Male only
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Tempe, Arizona
Source: ClinicalTrials.gov public record
Updated Jan 7, 2011 · Synced Oct 17, 2026, 11:09 AM EDT
Recruiting Phase 2 Interventional Accepts healthy volunteers

Brain Blood Vessel Responses to Changes in Blood Flow: Younger Cohort

NCT06629090
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
20 Years to 40 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jul 6, 2026 · Synced Oct 17, 2026, 11:09 AM EDT