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Showing 1–24 of 59 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Hydroxychloroquine Placebo Clear all
Completed Phase 3 Interventional Results available

Post-exposure Prophylaxis / Preemptive Therapy for SARS-Coronavirus-2

NCT04308668
View directory record Official record
Conditions
Corona Virus Infection, Acute Respiratory Distress Syndrome, SARS-CoV Infection, Coronavirus, Coronavirus Infections
Interventions
Hydroxychloroquine, Placebo
Drug · Other
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
1,312 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
2
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated May 12, 2021 · Synced Sep 25, 2026, 3:13 AM EDT
Withdrawn Phase 2 Interventional

A Study of Hydroxycholoroquine Compared to Placebo as Treatment for People With COVID-19

NCT04379492
View directory record Official record
Conditions
COVID-19, COVID19, Sars-CoV2, SARS-Cov-2
Interventions
Hydroxychloroquine, Placebo
Drug · Other
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 15, 2025 · Synced Sep 25, 2026, 3:13 AM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

The PATCH Trial (Prevention And Treatment of COVID-19 With Hydroxychloroquine)

NCT04329923
View directory record Official record
Conditions
COVID-19
Interventions
Hydroxychloroquine Sulfate 400 mg twice a day, Hydroxychloroquine Sulfate 600 mg twice a day, Hydroxychloroquine Sulfate 600 mg once a day, Placebo oral tablet
Drug
Lead sponsor
Ravi Amaravadi, MD
Other
Eligibility
18 Years and older
Enrollment
173 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 9, 2020 · Synced Sep 25, 2026, 3:13 AM EDT
Withdrawn Phase 2 Interventional

Asymptomatic COVID-19 Trial

NCT04374552
View directory record Official record
Conditions
SARS-CoV-2 Infection
Interventions
Hydroxychloroquine sulfate &Azithromycin, Placebo
Drug
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
20 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated Nov 1, 2020 · Synced Sep 25, 2026, 3:13 AM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

Strategy to Prevent the Onset of Clinically-Apparent Rheumatoid Arthritis

NCT02603146
View directory record Official record
Conditions
Healthy Participants, Rheumatoid Arthritis (RA) Prevention
Interventions
Hydroxychloroquine, HCQ Placebo
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
144 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2022
U.S. locations
14
States / cities
Birmingham, Alabama • Los Angeles, California • San Francisco, California + 10 more
Source: ClinicalTrials.gov public record
Updated Jun 11, 2025 · Synced Sep 25, 2026, 3:13 AM EDT
Completed Phase 4 Interventional Results available

Moderate Rheumatoid Arthritis (RA) With Etanercept (Enbrel)

NCT01313208
View directory record Official record
Conditions
Rheumatoid Arthritis
Interventions
etanercept, Placebo, DMARD Therapy
Drug
Lead sponsor
Amgen
Industry
Eligibility
18 Years to 80 Years
Enrollment
210 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
38
States / cities
Birmingham, Alabama • Tuscaloosa, Alabama • Peoria, Arizona + 34 more
Source: ClinicalTrials.gov public record
Updated Feb 8, 2017 · Synced Sep 25, 2026, 3:13 AM EDT
Completed Phase 2 Interventional Results available

University of Utah COVID-19 Hydrochloroquine Trial

NCT04342169
View directory record Official record
Conditions
Coronavirus Infection, Coronavirus, Infectious Disease
Interventions
Hydroxychloroquine, Placebo oral tablet
Drug
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
368 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Feb 14, 2023 · Synced Sep 25, 2026, 3:13 AM EDT
Completed Phase 2 Interventional Results available

Study of Anti-Malarials in Incomplete Lupus Erythematosus

NCT03030118
View directory record Official record
Conditions
Systemic Lupus Erythematosus
Interventions
Hydroxychloroquine, Placebo Oral Capsule
Drug
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
15 Years to 49 Years
Enrollment
187 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2024
U.S. locations
7
States / cities
Los Angeles, California • Aurora, Colorado • Great Neck, New York + 4 more
Source: ClinicalTrials.gov public record
Updated Sep 15, 2025 · Synced Sep 25, 2026, 3:13 AM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Hydroxychloroquine for COVID-19 Post-exposure Prophylaxis (PEP)

NCT04328961
View directory record Official record
Conditions
COVID-19, Corona Virus Infection, SARS (Severe Acute Respiratory Syndrome), SARS-CoV-2
Interventions
Hydroxychloroquine Sulfate, Ascorbic Acid
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 80 Years
Enrollment
943 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
8
States / cities
Los Angeles, California • New Orleans, Louisiana • Baltimore, Maryland + 4 more
Source: ClinicalTrials.gov public record
Updated Dec 15, 2021 · Synced Sep 25, 2026, 3:13 AM EDT
Completed Phase 2 Interventional Results available

Hydroxychloroquine and Metabolic Outcomes in Patients Undergoing TPAIT

NCT03283566
View directory record Official record
Conditions
Chronic Pancreatitis, Insulin Dependent Diabetes
Interventions
Hydroxychloroquine, Placebo
Drug
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years to 65 Years
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 7, 2022 · Synced Sep 25, 2026, 3:13 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Rediscovering Hydroxychloroquine as a Novel Insulin Sensitizer

NCT02124681
View directory record Official record
Conditions
Insulin Resistance
Interventions
Hydroxychloroquine, Placebo
Drug · Other
Lead sponsor
University of Pittsburgh
Other
Eligibility
21 Years to 69 Years
Enrollment
34 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2016
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 5, 2017 · Synced Sep 25, 2026, 3:13 AM EDT
Completed Phase 3 Interventional Results available

Pre-exposure Prophylaxis for SARS-Coronavirus-2

NCT04328467
View directory record Official record
Conditions
COVID-19, Corona Virus Infection, ARDS, Acute Respiratory Distress Syndrome
Interventions
Hydroxychloroquine, Placebo
Drug · Other
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
1,483 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
2
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 1, 2021 · Synced Sep 25, 2026, 3:13 AM EDT
Terminated Phase 2 Interventional

Baricitinib, Placebo and Antiviral Therapy for the Treatment of Patients With Moderate and Severe COVID-19

NCT04373044
View directory record Official record
Conditions
Symptomatic COVID-19 Infection Laboratory-Confirmed
Interventions
Baricitinib, Hydroxychloroquine, Placebo Administration
Drug
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
2
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated May 25, 2021 · Synced Sep 25, 2026, 3:13 AM EDT
Terminated Phase 2 Interventional Results available

A Triple Combination Antiviral Coronavirus Therapy (TriACT) for COVID-19

NCT04605588
View directory record Official record
Conditions
SARS-CoV Infection, Covid19
Interventions
Nitazoxanide, Placebo Nitazoxanide, Ribavirin, Placebo Ribavirin, Hydroxychloroquine, Placebo Hydroxychloroquine
Drug
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
21 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
New Brunswick, New Jersey
Source: ClinicalTrials.gov public record
Updated May 4, 2022 · Synced Sep 25, 2026, 3:13 AM EDT
Terminated Phase 3 Interventional Accepts healthy volunteers Results available

Will Hydroxychloroquine Impede or Prevent COVID-19

NCT04341441
View directory record Official record
Conditions
COVID-19, Coronavirus, Coronavirus Infections, SARS-CoV 2
Interventions
Hydroxychloroquine - Daily Dosing, Hydroxychloroquine - Weekly Dosing, Placebo oral tablet, Monitoring Visit - Baseline, Monitoring Visit - Week 4, Monitoring Visit - Week 8, Weekly Assessment
Drug · Other · Diagnostic Test
Lead sponsor
Henry Ford Health System
Other
Eligibility
18 Years to 75 Years
Enrollment
624 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Jun 20, 2022 · Synced Sep 25, 2026, 3:13 AM EDT
Not listed Phase 3 Interventional Accepts healthy volunteers

HEalth Care Worker pROphylaxis Against COVID-19: The HERO Trial

NCT04352946
View directory record Official record
Conditions
Prophylaxis, COVID-19, Health Care Worker, Hydroxychloroquine
Interventions
Hydroxychloroquine Pre-Exposure Prophylaxis, Placebo oral tablet
Drug
Lead sponsor
GeoSentinel Foundation
Other
Eligibility
18 Years and older
Enrollment
374 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 21, 2020 · Synced Sep 25, 2026, 3:13 AM EDT
Completed Phase 2 Interventional Results available

A Phase 2a, Efficacy and Safety Study of Ustekinumab in Systemic Lupus Erythematosus

NCT02349061
View directory record Official record
Conditions
Lupus Erythematosus, Systemic
Interventions
Ustekinumab IV, Placebo Infusion, Placebo SC, Ustekinumab SC, Concomitant Medication
Drug · Other
Lead sponsor
Janssen Research & Development, LLC
Industry
Eligibility
18 Years to 75 Years
Enrollment
102 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
12
States / cities
Huntsville, Alabama • Beverly Hills, California • Tampa, Florida + 9 more
Source: ClinicalTrials.gov public record
Updated Mar 23, 2020 · Synced Sep 25, 2026, 3:13 AM EDT
Not listed Phase 4 Interventional

Hydroxychloroquine Use in Hospitalized Patients With COVID-19: Impact on Progression to Severe or Critical Disease

NCT04429867
View directory record Official record
Conditions
COVID-19
Interventions
Hydroxychloroquine, Placebo
Drug
Lead sponsor
WellStar Health System
Other
Eligibility
18 Years and older
Enrollment
700 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Marietta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 15, 2020 · Synced Sep 25, 2026, 3:13 AM EDT
Completed Phase 2 Interventional Results available

Management of Cardiovascular Disease in Kidney Disease (MaCK) Study

NCT03636152
View directory record Official record
Conditions
Chronic Kidney Disease, Cardiovascular Disease, Inflammation, Atherosclerosis, Aortic Stiffness
Interventions
MRI carotid, APWV, Hydroxychloroquine, Matching Placebo
Procedure · Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years to 80 Years
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Aug 19, 2026 · Synced Sep 25, 2026, 3:13 AM EDT
Completed Phase 3 Interventional Results available

Outcomes Related to COVID-19 Treated With Hydroxychloroquine Among In-patients With Symptomatic Disease

NCT04332991
View directory record Official record
Conditions
Coronavirus, Acute Respiratory Infection, SARS-CoV Infection
Interventions
Hydroxychloroquine, Placebo
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
479 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
40
States / cities
Tucson, Arizona • Fresno, California • Los Angeles, California + 31 more
Source: ClinicalTrials.gov public record
Updated Mar 16, 2021 · Synced Sep 25, 2026, 3:13 AM EDT
Not listed Phase 3 Interventional Accepts healthy volunteers

Hydroxychloroquine as Prophylaxis for COVID-19 in Healthcare Workers (HCQPreP)

NCT04363450
View directory record Official record
Conditions
COVID-19, Corona Virus Infection, Wuhan Coronavirus, Prophylaxis, Healthcare Worker, Sars-CoV2, Hydroxychloroquine
Interventions
Hydroxychloroquine, Placebo
Drug
Lead sponsor
Louisiana State University Health Sciences Center in New Orleans
Other
Eligibility
18 Years and older
Enrollment
1,700 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
2
States / cities
Lafayette, Louisiana
Source: ClinicalTrials.gov public record
Updated Sep 1, 2020 · Synced Sep 25, 2026, 3:13 AM EDT
Terminated Phase 2 Interventional Results available

CD40L Antagonism in Rheumatoid Arthritis (RA)

NCT05306353
View directory record Official record
Conditions
Rheumatoid Arthritis
Interventions
Placebo for VIB4920, VIB4920 with TNFi, VIB4920 without TNFi
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
5
States / cities
San Francisco, California • Aurora, Colorado • Boston, Massachusetts + 2 more
Source: ClinicalTrials.gov public record
Updated Jul 19, 2026 · Synced Sep 25, 2026, 3:13 AM EDT
Terminated Phase 1 Interventional

Hydroxychloroquine in Outpatient Adults With COVID-19

NCT04333654
View directory record Official record
Conditions
Coronavirus Infection
Interventions
Hydroxychloroquine SAR321068, Placebo
Drug
Lead sponsor
Sanofi
Industry
Eligibility
18 Years to 80 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 22, 2025 · Synced Sep 25, 2026, 3:13 AM EDT
Suspended Phase 3 Interventional

VA Remote and Equitable Access to COVID-19 Healthcare Delivery (VA-REACH TRIAL)

NCT04363203
View directory record Official record
Conditions
SARS-CoV-2, COVID-19
Interventions
Hydroxychloroquine, Azithromycin, Placebo oral tablet
Drug
Lead sponsor
Salomeh Keyhani MD
Federal
Eligibility
216 Months and older
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jun 21, 2020 · Synced Sep 25, 2026, 3:13 AM EDT