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Showing 1–24 of 156 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: HCTZ-hydrochlorothiazide Clear all
Completed Phase 3 Interventional Results available

Diuretic Comparison Project

NCT02185417
View directory record Official record
Conditions
Hypertension
Interventions
Hydrochlorothiazide (HCTZ), Chlorthalidone (CTD)
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
65 Years and older
Enrollment
20,723 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2022
U.S. locations
69
States / cities
Birmingham, Alabama • Anchorage, Alaska • Fayetteville, Arkansas + 64 more
Source: ClinicalTrials.gov public record
Updated May 21, 2024 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Phase 3 Interventional

Safety/Efficacy of Combo Therapy With Aliskiren & Hydrochlorothiazide vs Therapy With Hydrochlorothiazide Alone in Patients With Hypertension

NCT00387517
View directory record Official record
Conditions
Hypertension
Interventions
Aliskiren/HCTZ
Drug
Lead sponsor
Novartis
Industry
Eligibility
18 Years and older
Enrollment
726 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
1
States / cities
East Hanover, New Jersey
Source: ClinicalTrials.gov public record
Updated Feb 6, 2017 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Phase 3 Interventional

Ramipril and Hydrochlorothiazide Alone and in Combination for the Treatment of Essential Hypertension

NCT00355589
View directory record Official record
Conditions
Hypertension, Blood Pressure, High
Interventions
Ramipril and hydrochlorothiazide
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 80 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
60
States / cities
Birmingham, Alabama • Huntsville, Alabama • Glendale, Arizona + 51 more
Source: ClinicalTrials.gov public record
Updated Oct 9, 2012 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Phase 4 Interventional Results available

A Dose Escalation Study of a Combination Antihypertensive Drug in the Treatment of Various Groups of Patients Who do Not Respond to Single Drug Treatment of Their High Blood Pressure

NCT00791258
View directory record Official record
Conditions
Hypertension
Interventions
amlodipine and olmesartan medoxomil tablets, hydrochlorothiazide tablets
Drug
Lead sponsor
Daiichi Sankyo
Industry
Eligibility
18 Years and older
Enrollment
999 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
72
States / cities
Birmingham, Alabama • Green Valley, Arizona • Mesa, Arizona + 69 more
Source: ClinicalTrials.gov public record
Updated Jan 8, 2019 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Crossover Bioequivalence Study of Irbesartan HCTZ 300/25 mg Tablets Under Fasted Conditions

NCT01712139
View directory record Official record
Conditions
Hypertension
Interventions
Irbesartan and Hydrochlorothiazide, Avalide
Drug
Lead sponsor
Roxane Laboratories
Industry
Eligibility
18 Years to 45 Years
Enrollment
37 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Jan 22, 2018 · Synced Sep 4, 2026, 1:30 AM EDT
Terminated Phase 3 Interventional Results available

Study to Evaluate Symptoms in Patients Treated With Nebivolol or Metoprolol Extended-release (ER) for Hypertension

NCT00547300
View directory record Official record
Conditions
Hypertension
Interventions
Metoprolol ER, Nebivolol
Drug
Lead sponsor
Forest Laboratories
Industry
Eligibility
18 Years to 80 Years
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
24
States / cities
Birmingham, Alabama • Beverly Hills, California • Encinitas, California + 21 more
Source: ClinicalTrials.gov public record
Updated May 20, 2019 · Synced Sep 4, 2026, 1:30 AM EDT
Completed No phase listed Observational Results available

Data Analysis for Drug Repurposing for Effective Alzheimer's Medicines (DREAM)- Dihydropyridine Calcium Channel Blockers Versus Hydrochlorothiazide

NCT05125224
View directory record Official record
Conditions
Hypertension
Interventions
Dihydropyridine calcium channel blocker, Hydrochlorothiazide
Drug
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
65 Years and older
Enrollment
163,720 participants
Timeline
2021 – 2023
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 5, 2025 · Synced Sep 4, 2026, 1:30 AM EDT
Withdrawn Phase 4 Interventional

Association of Diuretics With Change in Extracellular Volume, Natriuretic Peptides, Symptoms, and Cardiovascular Outcomes in CKD

NCT04192110
View directory record Official record
Conditions
Chronic Kidney Disease
Interventions
Diuretic initiation or augmentation
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Dec 8, 2021 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Phase 3 Interventional

A Clinical Study to Compare Long-term Efficacy and Safety of an Aliskiren Based Regimen to a Hydrochlorothiazide Based Treatment Regimen With Optional Addition of Amlodipine

NCT00294710
View directory record Official record
Conditions
Hypertension
Interventions
Aliskiren
Drug
Lead sponsor
Novartis
Industry
Eligibility
18 Years to 80 Years
Enrollment
976 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2006
U.S. locations
1
States / cities
East Hanover, New Jersey
Source: ClinicalTrials.gov public record
Updated Nov 7, 2011 · Synced Sep 4, 2026, 1:30 AM EDT
Withdrawn Phase 4 Interventional

Evaluating the Effect of Aliskiren Versus HCTZ on Coronary Flow Reserve in Hypertensive Type II Diabetics

NCT00994253
View directory record Official record
Conditions
Hypertension, Diabetes Type 2
Interventions
Aliskiren, Hydrochlorothiazide
Drug
Lead sponsor
Corewell Health East
Other
Eligibility
18 Years to 85 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
Royal Oak, Michigan
Source: ClinicalTrials.gov public record
Updated Oct 1, 2017 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Phase 4 Interventional Results available

The Effects of Moderate vs. Aggressive Treatment With Valsartan + Amlodipine on Patients With Hypertension Uncontrolled by Angiotensin-Receptor Blocker (Herein, ARB) Monotherapy

NCT00666536
View directory record Official record
Conditions
Hypertension
Interventions
valsartan and amlodipine
Drug
Lead sponsor
Novartis
Industry
Eligibility
18 Years and older
Enrollment
728 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2008
U.S. locations
1
States / cities
Metairie, Louisiana
Source: ClinicalTrials.gov public record
Updated Oct 26, 2016 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Moexipril HCl/Hydrochlorothiazide 15/25 mg Tablets Under Non-Fasting Conditions

NCT00834067
View directory record Official record
Conditions
Healthy
Interventions
Moexipril HCl/hydrochlorothiazide 15/25 mg tablets, UNIRETIC® 15/25 mg tablets
Drug
Lead sponsor
Teva Pharmaceuticals USA
Industry
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2003
U.S. locations
2
States / cities
Saint Charles, Missouri • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 19, 2024 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Tolerance to Target Doses of Thiazides in Actual Practice: A Feasibility Study

NCT01235377
View directory record Official record
Conditions
Hypertension
Interventions
Favor one of two thiazides for new prescriptions & attempt target dose
Other
Lead sponsor
VA Pharmacy Benefits Management Strategic Healthcare Group
Federal
Eligibility
Not listed
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2014
U.S. locations
5
States / cities
Hines, Illinois • Asheville, North Carolina • Wilkes-Barre, Pennsylvania + 2 more
Source: ClinicalTrials.gov public record
Updated Nov 24, 2014 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Phase 3 Interventional Results available

Efficacy and Safety of the Combination Aliskiren (300 mg) and Hydrochlorothiazide (25mg) to Aliskiren (300mg) Monotherapy in Patients With Staged II Hypertension

NCT00705575
View directory record Official record
Conditions
Hypertension
Interventions
Aliskiren/hydrochlorothiazide (HCTZ) (300/25 mg), Aliskiren (300 mg)
Drug
Lead sponsor
Novartis
Industry
Eligibility
18 Years and older
Enrollment
688 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
1
States / cities
East Hanover, New Jersey
Source: ClinicalTrials.gov public record
Updated May 29, 2011 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Not applicable Interventional

OPTImizing Precision of Hypertension Care to Maximize Blood Pressure Control Pilot (OPTI-BP Pilot)

NCT02814552
View directory record Official record
Conditions
High Blood Pressure
Interventions
HTN PRA App, Blood Sample
Other
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 65 Years
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
3
States / cities
Macclenny, Florida • Old Town, Florida • Tallahassee, Florida
Source: ClinicalTrials.gov public record
Updated Oct 24, 2018 · Synced Sep 4, 2026, 1:30 AM EDT
Withdrawn Phase 4 Interventional

Ertugliflozin Versus Hydrochlorothiazide in Reducing Sympathetic Neural Overactivity in Patients With Hypertension and Recently-diagnosed Type 2 Diabetes.

NCT03640221
View directory record Official record
Conditions
Hypertension, Diabetes Mellitus, Type 2
Interventions
Ertugliflozin, Hydrochlorothiazide 12.5mg, Microneurography, SKNA recordings, Static Handgrip, Post-handgrip forearm vascular occlusion, Testing of the Arterial Baroreflex Function
Drug · Device · Other
Lead sponsor
Cedars-Sinai Medical Center
Other
Eligibility
35 Years to 65 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jan 13, 2020 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Early Phase 1 Interventional

N-of-1 Trials for Blood Pressure Medications in Adults

NCT02744456
View directory record Official record
Conditions
Hypertension, High Blood Pressure
Interventions
Losartan, Amlodipine, Hydrochlorothiazide
Drug
Lead sponsor
Columbia University
Other
Eligibility
21 Years to 80 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 25, 2019 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Phase 4 Interventional Results available

Efficacy and Safety of Valsartan/Hydrochlorothiazide Combination Compared to Valsartan Monotherapy or Hydrochlorothiazide Monotherapy in Elderly (>70) With Mild-moderate Hypertension.

NCT00698646
View directory record Official record
Conditions
Hypertension
Interventions
Valsartan + HCTZ, Valsartan, HCTZ
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
70 Years and older
Enrollment
384 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
20
States / cities
Birmingham, Alabama • Phoenix, Arizona • Escondido, California + 17 more
Source: ClinicalTrials.gov public record
Updated Apr 18, 2011 · Synced Sep 4, 2026, 1:30 AM EDT
Completed No phase listed Observational

Genetic Epidemiology of Responses to Antihypertensives

NCT00005520
View directory record Official record
Conditions
Cardiovascular Diseases, Heart Diseases, Hypertension
Interventions
Hydrochlorothiazide, Candesartan
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 60 Years
Enrollment
1,200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1997 – 2008
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jan 16, 2013 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Not applicable Interventional

Optimal HCTZ Cessation for Diagnosis of Hyperparathyroidism

NCT02591160
View directory record Official record
Conditions
Hyperparathyroidism
Interventions
HCTZ cessation
Procedure
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Jan 7, 2018 · Synced Sep 4, 2026, 1:30 AM 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 4, 2026, 1:30 AM EDT
Completed Phase 3 Interventional Results available

Action to Control Cardiovascular Risk in Diabetes (ACCORD)

NCT00000620
View directory record Official record
Conditions
Atherosclerosis, Cardiovascular Diseases, Hypercholesterolemia, Hypertension, Diabetes Mellitus, Type 2, Diabetes Mellitus, Coronary Disease
Interventions
Anti-hyperglycemic Agents, Anti-hypertensive Agents, Blinded fenofibrate or placebo plus simvastatin
Drug
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
40 Years to 79 Years
Enrollment
10,251 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2012
U.S. locations
6
States / cities
Minneapolis, Minnesota • New York, New York • Winston-Salem, North Carolina + 3 more
Source: ClinicalTrials.gov public record
Updated Nov 21, 2016 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Phase 4 Interventional

Randomized, Double-Blind, Placebo-Controlled, Forced-Titration, Comparing Telmisartan vs Valsartan. Taken Orally for Eight Weeks in Patients With Stage 1 and Stage 2 Hypertension

NCT00168779
View directory record Official record
Conditions
Hypertension
Interventions
telmisartan 80 mg / hydrochlorothiazide 25 mg, valsartan 160 mg / hydrochlorothiazide 25 mg, placebo
Drug
Lead sponsor
Boehringer Ingelheim
Industry
Eligibility
18 Years and older
Enrollment
1,185 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2006
U.S. locations
113
States / cities
Athens, Alabama • Birmingham, Alabama • Huntsville, Alabama + 90 more
Source: ClinicalTrials.gov public record
Updated Dec 27, 2017 · Synced Sep 4, 2026, 1:30 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Bioequivalence Study of Benazepril HCl / Hydrochlorothiazide 20 mg/ 25 mg Tablets Under Fasting Conditions

NCT00778726
View directory record Official record
Conditions
Healthy
Interventions
Benazepril HCl/ Hydrochlorothiazide 20 mg/ 25 mg Tablets
Drug
Lead sponsor
Ranbaxy Laboratories Limited
Industry
Eligibility
18 Years and older
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 22, 2008 · Synced Sep 4, 2026, 1:30 AM EDT