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Showing 1–24 of 130 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: COVID-19 (Prevention) Clear all
Terminated Phase 2 Interventional Results available

Inhaled Nitric Oxide for Preventing Progression in COVID-19

NCT04388683
View directory record Official record
Conditions
COVID-19
Interventions
Nitric Oxide
Drug
Lead sponsor
Tufts Medical Center
Other
Eligibility
18 Years to 85 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 18, 2022 · Synced Jul 22, 2026, 8:02 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Low vs. Moderate to High Dose Vitamin D for Prevention of COVID-19

NCT04868903
View directory record Official record
Conditions
SARS-CoV-2 Infection
Interventions
Vitamin D3
Dietary Supplement
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
1,475 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
2
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 21, 2026 · Synced Jul 22, 2026, 8:02 PM 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 Jul 22, 2026, 8:02 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

A Study of Ad26.COV2.S in Adults (COVID-19)

NCT04436276
View directory record Official record
Conditions
Covid-19 Prevention
Interventions
Ad26.COV2.S, Placebo
Biological
Lead sponsor
Janssen Vaccines & Prevention B.V.
Industry
Eligibility
18 Years and older
Enrollment
1,085 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
7
States / cities
San Diego, California • Melbourne, Florida • Peoria, Illinois + 4 more
Source: ClinicalTrials.gov public record
Updated Feb 3, 2025 · Synced Jul 22, 2026, 8:02 PM EDT
Active, not recruiting Phase 2 Interventional

A Phase 2 Study of RTB101 as COVID-19 Post-Exposure Prophylaxis in Older Adults

NCT04584710
View directory record Official record
Conditions
Covid19
Interventions
RTB101, Placebo
Drug
Lead sponsor
Restorbio Inc.
Industry
Eligibility
65 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
2
States / cities
Farmington, Connecticut • Roslindale, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 8, 2021 · Synced Jul 22, 2026, 8:02 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

NO Prevention of COVID-19 for Healthcare Providers

NCT04312243
View directory record Official record
Conditions
Coronavirus Infections, Healthcare Associated Infection
Interventions
Inhaled nitric oxide gas
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 99 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 19, 2026 · Synced Jul 22, 2026, 8:02 PM EDT
Not listed No phase listed Observational

Improving Cancer Screening and Prevention During the COVID-19 Pandemic in Underserved Populations of Rhode Island

NCT04587258
View directory record Official record
Conditions
Breast Cancer, Colorectal Cancer, Covid19
Interventions
Informational videos and social media campaigns encouraging cancer screening.
Behavioral
Lead sponsor
Rhode Island Hospital
Other
Eligibility
18 Years and older
Enrollment
100 participants
Timeline
2020 – 2022
U.S. locations
1
States / cities
Pawtucket, Rhode Island
Source: ClinicalTrials.gov public record
Updated Oct 13, 2020 · Synced Jul 22, 2026, 8:02 PM EDT
Completed Not applicable Interventional Results available

SAFE Workplace Intervention for People With IDD

NCT06112249
View directory record Official record
Conditions
Communicable Diseases, Prevention, Workplace Intervention
Interventions
SAFE Employment Training
Behavioral
Lead sponsor
Temple University
Other
Eligibility
18 Years and older
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
2
States / cities
Collingswood, New Jersey • Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 27, 2026 · Synced Jul 22, 2026, 8:02 PM EDT
Completed Not applicable Interventional Results available

Assess and Adapt to the Impact of COVID-19 on CVD Self-Management and Prevention Care in Adults Living With HIV

NCT04661813
View directory record Official record
Conditions
HIV-1-infection, Hypertension
Interventions
EXTRA-CVD Virtual Care
Other
Lead sponsor
Case Western Reserve University
Other
Eligibility
18 Years and older
Enrollment
81 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
3
States / cities
Durham, North Carolina • Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 23, 2024 · Synced Jul 22, 2026, 8:02 PM EDT
Terminated Phase 2 Interventional Results available

Tocilizumab for Prevention of Respiratory Failure in Patients With Severe COVID-19 Infection

NCT04377659
View directory record Official record
Conditions
COVID-19
Interventions
Tocilizumab
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 27, 2025 · Synced Jul 22, 2026, 8:02 PM EDT
Terminated Phase 2 Interventional

Phase 2 Study to Determine if RTB101 Reduces the Severity of COVID-19 in Older Adults Residing in Nursing Homes

NCT04409327
View directory record Official record
Conditions
COVID19
Interventions
RTB101, Placebo
Drug
Lead sponsor
Restorbio Inc.
Industry
Eligibility
65 Years and older
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Middletown, Rhode Island
Source: ClinicalTrials.gov public record
Updated Feb 9, 2021 · Synced Jul 22, 2026, 8:02 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Safety and Immunogenicity Study of 2019-nCoV Vaccine (mRNA-1273) for Prophylaxis of SARS-CoV-2 Infection (COVID-19)

NCT04283461
View directory record Official record
Conditions
COVID-19, COVID-19 Immunisation
Interventions
mRNA-1273
Biological
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 99 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2022
U.S. locations
3
States / cities
Decatur, Georgia • Bethesda, Maryland • Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Mar 17, 2024 · Synced Jul 22, 2026, 8:02 PM EDT
Not listed Phase 2 Interventional

Prevention of COVID-19 Infection to Severe Pneumonia or ARDS

NCT04569227
View directory record Official record
Conditions
Covid19 Pneumonia
Interventions
EC-18, Placebo
Drug
Lead sponsor
Enzychem Lifesciences Corporation
Industry
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
2
States / cities
The Bronx, New York • Warwick, Rhode Island
Source: ClinicalTrials.gov public record
Updated Jun 9, 2021 · Synced Jul 22, 2026, 8:02 PM EDT
Recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

A Phase 1/2A, Randomized Study of a T Follicular Helper (TFH)-Targeting Genetic Vaccine Strategy Designed to Induce Broad, Durable Immune Responses

NCT06810934
View directory record Official record
Conditions
COVID-19, SARS-CoV-2 Infection
Interventions
CoTend-BXBB (SARS2-30404), CoTend-s3BXBB (SARS2-17032), Placebo
Biological
Lead sponsor
Kara Chew
Other
Eligibility
40 Years to 64 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2029
U.S. locations
2
States / cities
Los Angeles, California • San Francisco, California
Source: ClinicalTrials.gov public record
Updated Oct 30, 2025 · Synced Jul 22, 2026, 8:02 PM EDT
Completed Phase 4 Interventional Results available

Prevention of Arteriovenous Thrombotic Events in Critically-Ill COVID-19 Patients Trial

NCT04409834
View directory record Official record
Conditions
COVID-19, Venous Thromboembolism, Arterial Thrombosis
Interventions
Unfractionated Heparin IV, Enoxaparin 1 mg/kg, Clopidogrel, Unfractionated heparin SC, Enoxaparin 40 mg SC
Drug
Lead sponsor
The TIMI Study Group
Other
Eligibility
18 Years and older
Enrollment
390 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 18, 2024 · Synced Jul 22, 2026, 8:02 PM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Covid-19 Long Haul Preventative and Health Promotion Care Clinical Trial Acceleration Program.

NCT06441955
View directory record Official record
Conditions
COVID-19, Long Haul
Interventions
Ritonavir-Boosted Nirmatrelvir (Paxlovid), Physiological Evaluation, Moderna COVID-19 Vaccine, Biopsychological, Behavioral (e.g., Psychotherapy, Lifestyle Counseling), Genetic (including gene transfer, stem cell and recombinant DNA), Multidisciplinary approach
Drug · Diagnostic Test · Biological + 3 more
Lead sponsor
Well- Konnect Healthcare Services and Research Firm
Network
Eligibility
18 Years to 65 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2030
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 26, 2024 · Synced Jul 22, 2026, 8:02 PM 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 Jul 22, 2026, 8:02 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

COVID-19 Preventive Behavior in African Americans

NCT04700462
View directory record Official record
Conditions
Covid19, Health Behavior
Interventions
Sm-EMA
Behavioral
Lead sponsor
Johns Hopkins University
Other
Eligibility
60 Years and older
Enrollment
250 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 2, 2021 · Synced Jul 22, 2026, 8:02 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Study of MK-4482 for Prevention of Coronavirus Disease 2019 (COVID-19) in Adults (MK-4482-013)

NCT04939428
View directory record Official record
Conditions
Coronavirus Disease (COVID-19)
Interventions
Molnupiravir, Placebo
Drug
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
18 Years and older
Enrollment
2,441 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2022
U.S. locations
59
States / cities
Birmingham, Alabama • Mesa, Arizona • Tucson, Arizona + 53 more
Source: ClinicalTrials.gov public record
Updated Sep 25, 2024 · Synced Jul 22, 2026, 8:02 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Topical Antibacterial Agents for Prevention of COVID-19

NCT05449392
View directory record Official record
Conditions
COVID-19, SARS-CoV2 Infection
Interventions
Neosporin, Vaseline
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
18 Years to 60 Years
Enrollment
67 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Oct 2, 2023 · Synced Jul 22, 2026, 8:02 PM EDT
Terminated Phase 2 Interventional Results available

Saved From COVID-19 - Chloroquine (CQ) Prophylaxis for Health Care Workers at Risk for COVID

NCT04349371
View directory record Official record
Conditions
COVID, Coronavirus Infection
Interventions
Chloroquine, Placebo oral tablet
Drug
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 26, 2025 · Synced Jul 22, 2026, 8:02 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Hydroxychloroquine as Chemoprevention for COVID-19 for High Risk Healthcare Workers

NCT04345653
View directory record Official record
Conditions
Covid19
Interventions
Hydroxychloroquine Sulfate (HCQ)
Drug
Lead sponsor
Hackensack Meridian Health
Other
Eligibility
18 Years to 99 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
1
States / cities
Edison, New Jersey
Source: ClinicalTrials.gov public record
Updated May 11, 2021 · Synced Jul 22, 2026, 8:02 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

A Study of Ad26.COV2.S for the Prevention of SARS-CoV-2-Mediated COVID-19 in Adult Participants

NCT04505722
View directory record Official record
Conditions
Participants With or Without Stable Co-morbidities Associated With Progression to Severe COVID-19 at Different Stages of the Protocol
Interventions
Ad26.COV2.S, Placebo
Biological · Other
Lead sponsor
Janssen Vaccines & Prevention B.V.
Industry
Eligibility
18 Years and older
Enrollment
44,325 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
117
States / cities
Birmingham, Alabama • Huntsville, Alabama • Glendale, Arizona + 77 more
Source: ClinicalTrials.gov public record
Updated Feb 3, 2025 · Synced Jul 22, 2026, 8:02 PM EDT
Terminated Phase 1 Interventional

Treatment and Prevention of Acute Lung Injury (ALI) in Patients With COVID-19 Infection

NCT04526912
View directory record Official record
Conditions
Acute Lung Injury
Interventions
VIB7734, Placebo
Drug
Lead sponsor
Viela Bio
Industry
Eligibility
18 Years to 80 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 16, 2021 · Synced Jul 22, 2026, 8:02 PM EDT