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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Placebo Comparator Challenge Clear all
Completed Not applicable Interventional Accepts healthy volunteers

Leukotriene Antagonism in Recruitment of CD49d Expressing Neutrophils in Atopic Subjects

NCT03039101
View directory record Official record
Conditions
Nasal Allergy
Interventions
Nasal lavage, Nasal allergen challenge, Epicutaneous skin testing, Peripheral blood, Montelukast 10Mg Tablet, Placebo Oral Tablet
Procedure · Drug
Lead sponsor
Mitchell Grayson
Other
Eligibility
21 Years to 65 Years
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Oct 6, 2019 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Phase 2 Interventional

Placebo-Controlled, Single-Dose Challenge Study of Gaboxadol in Adult Males With Fragile X Syndrome (FXS)

NCT06334419
View directory record Official record
Conditions
Fragile X Syndrome
Interventions
Gaboxadol, Placebo
Drug
Lead sponsor
Craig Erickson
Other
Eligibility
18 Years to 40 Years · Male only
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 22, 2025 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Impact of Metformin in Teens With Polycystic Ovary Syndrome (PCOS) on Oral Contraceptive Therapy

NCT00283816
View directory record Official record
Conditions
Polycystic Ovary Syndrome
Interventions
Metformin, Oral Contraceptive Pill, Lifestyle Management Program, Quality of Life Questionnaire, Oral Glucose Tolerance Test, Blood work, Abdominal Ultra Sound, Dual-energy x-ray absorptiometry (DEXA scan), placebo
Drug · Behavioral · Procedure
Lead sponsor
University of Rochester
Other
Eligibility
12 Years to 18 Years · Female only
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2008
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated May 14, 2015 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Phase 2 Interventional Results available

A Multiple Dose Opioid Challenge Study

NCT02611752
View directory record Official record
Conditions
Moderate or Severe Opioid Use Disorder
Interventions
CAM2038
Drug
Lead sponsor
Braeburn Pharmaceuticals
Industry
Eligibility
18 Years to 55 Years
Enrollment
47 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
3
States / cities
Overland Park, Kansas • Lexington, Kentucky • New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 13, 2019 · Synced Sep 24, 2026, 10:11 PM EDT
Completed No phase listed Observational

Yale Swallow Protocol in Extubated Patients

NCT03352908
View directory record Official record
Conditions
Dysphagia
Interventions
Not listed
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years and older
Enrollment
166 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Sep 13, 2021 · Synced Sep 24, 2026, 10:11 PM EDT
Recruiting Phase 1Phase 2 Interventional Accepts healthy volunteers

Neural Response to Inflammatory Challenge in Major Depressive Disorder

NCT04751331
View directory record Official record
Conditions
Major Depressive Disorder
Interventions
LPS, Saline
Biological
Lead sponsor
Laureate Institute for Brain Research, Inc.
Other
Eligibility
18 Years to 65 Years
Enrollment
180 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Tulsa, Oklahoma
Source: ClinicalTrials.gov public record
Updated Apr 20, 2026 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Phase 2 Interventional Results available

Efficacy and Safety of Vascana® in Subjects With Secondary Raynaud's Phenomenon

NCT02688270
View directory record Official record
Conditions
Raynaud's Phenomenon Secondary to Connective Tissue Disease
Interventions
Vascana (0.9% nitroglycerin cream), Vehicle Cream (placebo)
Drug
Lead sponsor
Covis Pharma S.à.r.l.
Industry
Eligibility
18 Years to 75 Years
Enrollment
65 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016
U.S. locations
1
States / cities
Multiple Locations, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 1, 2022 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

An Inflammatory Challenge Using Endotoxin

NCT04310423
View directory record Official record
Conditions
Alcohol Use Disorder, Inflammatory Response, Craving, Depressed Mood
Interventions
Placebo, Endotoxin
Drug · Biological
Lead sponsor
University of California, Los Angeles
Other
Eligibility
21 Years to 45 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 30, 2025 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

FlaxFx, A Research Study of the Effects of Flaxseed Lignans on Colon Health

NCT01619020
View directory record Official record
Conditions
Healthy
Interventions
Flaxseed Lignans
Dietary Supplement
Lead sponsor
Fred Hutchinson Cancer Center
Other
Eligibility
20 Years to 45 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2017
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 12, 2017 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers

Norwalk Vaccine Study

NCT00973284
View directory record Official record
Conditions
Acute Gastroenteritis, Norwalk Virus Infection
Interventions
Norwalk VLP vaccine, mannitol and sucrose, Norwalk virus
Biological
Lead sponsor
Takeda
Industry
Eligibility
18 Years to 50 Years
Enrollment
98 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2010
U.S. locations
3
States / cities
Baltimore, Maryland • Cincinnati, Ohio • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 7, 2017 · Synced Sep 24, 2026, 10:11 PM EDT
Recruiting Phase 2 Interventional Accepts healthy volunteers

BPL-1357 Against H1N1 Influenza Virus Challenge

NCT07215858
View directory record Official record
Conditions
Influenza, Human
Interventions
BPL-1357 IM, BPL-1357 IN, Placebo IM, Placebo IN
Biological · Other
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years to 55 Years
Enrollment
129 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
2
States / cities
Bethesda, Maryland • Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Sep 23, 2026 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Safety and Efficacy Study of a Vaccine Against Enterotoxigenic Escherichia Coli (ETEC) to Prevent Moderate to Severe Diarrhea

NCT01060748
View directory record Official record
Conditions
Diarrhea
Interventions
ACE527, Placebo
Biological
Lead sponsor
TD Vaccines A/S
Industry
Eligibility
18 Years to 50 Years
Enrollment
70 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 6, 2011 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Inflammation-Induced Depressed Mood: The Role of Social Neurocognitive Mechanisms

NCT01671150
View directory record Official record
Conditions
Depression
Interventions
endotoxin
Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 50 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2013
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 17, 2014 · Synced Sep 24, 2026, 10:11 PM EDT
Not listed Phase 2 Interventional Accepts healthy volunteers

Therapeutic Effect of Chinese Herbal Medicine on Food Allergy

NCT00602160
View directory record Official record
Conditions
Food Allergy
Interventions
FAHF-2 (TM)
Drug
Lead sponsor
Li, Xiu-Min, M.D.
Individual
Eligibility
12 Years to 45 Years
Enrollment
68 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2012
U.S. locations
2
States / cities
Little Rock, Arkansas • New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 3, 2010 · Synced Sep 24, 2026, 10:11 PM EDT
Active, not recruiting Phase 2 Interventional Accepts healthy volunteers

A Human Challenge Study to Assess Protection of a Shigella Tetravalent Bioconjugate Vaccine

NCT06615375
View directory record Official record
Conditions
Shigellosis
Interventions
Shigella4V2, Placebo
Biological
Lead sponsor
LimmaTech Biologics AG
Industry
Eligibility
18 Years to 50 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
3
States / cities
Atlanta, Georgia • Baltimore, Maryland • Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 15, 2026 · Synced Sep 24, 2026, 10:11 PM EDT
Active, not recruiting Early Phase 1 Interventional

Efficacy of Spinal Manipulation Therapy or Mindfulness-based Reduction Therapy on Patients With Chronic Low Back Pain

NCT04744883
View directory record Official record
Conditions
Chronic Low-back Pain
Interventions
Spinal Manipulation Therapy (SMT), Naloxone, Placebo, Mindfulness Based Stress Reduction Therapy (MT)
Other · Drug · Behavioral
Lead sponsor
Rush University Medical Center
Other
Eligibility
18 Years to 75 Years
Enrollment
140 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
2
States / cities
Chicago, Illinois • Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jul 9, 2025 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Assess the Electrophysiology, Safety, Tolerability, Pharmacokinetics and Pharmacodynamics Response Using Magnetic Resonance Imaging of SAGE-718 Using a Ketamine Challenge in Healthy Subjects

NCT03770780
View directory record Official record
Conditions
Healthy Volunteer
Interventions
SAGE-718, Placebo
Drug
Lead sponsor
Supernus Pharmaceuticals, Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
2
States / cities
Long Beach, California • Berlin, New Jersey
Source: ClinicalTrials.gov public record
Updated Sep 16, 2025 · Synced Sep 24, 2026, 10:11 PM EDT
Withdrawn Phase 2Phase 3 Interventional

Empiric Quinidine for Asymptomatic Brugada Syndrome

NCT00789165
View directory record Official record
Conditions
Arrhythmia
Interventions
quinidine, no therapy
Drug
Lead sponsor
International Registry of Asymptomatic Brugada Syndrome
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2020
U.S. locations
1
States / cities
Wynnewood, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 12, 2020 · Synced Sep 24, 2026, 10:11 PM EDT
Not listed Phase 1Phase 2 Interventional

Impact of CBD-Rich Oil on Aversive Memory Reconsolidation

NCT04726475
View directory record Official record
Conditions
Anxiety and Fear
Interventions
Interoceptive Aversive Memory Reactivation, Cannabidiol (CBD)-Rich Broad Spectrum Hemp Extract Oil, Placebo Oil
Behavioral · Dietary Supplement
Lead sponsor
University of Texas at Austin
Other
Eligibility
18 Years to 65 Years
Enrollment
96 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Austin, Texas
Source: ClinicalTrials.gov public record
Updated Jan 18, 2022 · Synced Sep 24, 2026, 10:11 PM EDT
Terminated Phase 1 Interventional Accepts healthy volunteers

Study of AT-752 in Healthy Subjects in a Dengue Human Challenge Model

NCT05366439
View directory record Official record
Conditions
Dengue
Interventions
AT-752, Placebo Comparator
Drug
Lead sponsor
Atea Pharmaceuticals, Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Syracuse, New York
Source: ClinicalTrials.gov public record
Updated Apr 20, 2023 · Synced Sep 24, 2026, 10:11 PM EDT
Not listed Phase 2 Interventional

A Study of TL-925 for the Treatment of Allergic Conjunctivitis

NCT06153342
View directory record Official record
Conditions
Allergic Conjunctivitis
Interventions
TL-925, Placebo
Drug
Lead sponsor
Telios Pharma, Inc.
Industry
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Andover, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 30, 2023 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Drug Challenges Without Prior Skin Testing

NCT03158831
View directory record Official record
Conditions
Drug Hypersensitivity, Penicillin Allergy, Antibiotic Allergy
Interventions
Placebo-Controlled Graded Drug Challenge
Drug
Lead sponsor
Montefiore Medical Center
Other
Eligibility
7 Years and older
Enrollment
166 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2021
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Nov 15, 2021 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Phase 2 Interventional

A Study Of TL-925 For The Treatment of AC

NCT06293820
View directory record Official record
Conditions
Allergic Conjunctivitis
Interventions
TL-925, Placebo
Drug
Lead sponsor
Telios Pharma, Inc.
Industry
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
1
States / cities
Andover, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 2, 2024 · Synced Sep 24, 2026, 10:11 PM EDT
Completed Phase 3 Interventional

Pharmacodynamic Bioequivalence of Metered Dose Inhalers of Albuterol Sulfate in Patients With Stable Mild Asthma

NCT02624505
View directory record Official record
Conditions
Bronchial Asthma
Interventions
90 mcg Reference Product, 180 mcg Reference Product, 90 mcg Test Product, Placebo
Drug
Lead sponsor
Cipla Ltd.
Industry
Eligibility
18 Years to 65 Years
Enrollment
110 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 24, 2019 · Synced Sep 24, 2026, 10:11 PM EDT