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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Anosmia Clear all
Completed No phase listed Observational Accepts healthy volunteers

The Effects of Expectation on Natural and Drug -Induced Rewards

NCT01036230
View directory record Official record
Conditions
Drug Abuse
Interventions
Not listed
Lead sponsor
National Institute on Drug Abuse (NIDA)
NIH
Eligibility
18 Years to 50 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2019
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 4, 2019 · Synced Jul 21, 2026, 6:07 PM EDT
Completed Phase 2 Interventional Results available

Efficacy of Gabapentin for Post-Covid-19 Olfactory Dysfunction

NCT05184192
View directory record Official record
Conditions
COVID-19, Olfactory Disorder, Anosmia, Hyposmia, Parosmia
Interventions
Gabapentin gelatin capsules 300mg, Placebo
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 65 Years
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Mar 3, 2025 · Synced Jul 21, 2026, 6:07 PM EDT
Completed Not applicable Interventional

At-Home Olfactory Training

NCT03611673
View directory record Official record
Conditions
Olfactory Disorder
Interventions
Smell Test
Other
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Jul 19, 2023 · Synced Jul 21, 2026, 6:07 PM EDT
Completed No phase listed Observational

Decrease in Sense of Smell and Associated Cognitive Decline in Parkinson's Disease

NCT01572142
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Not listed
Lead sponsor
University of Michigan
Other
Eligibility
50 Years and older
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2016
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Sep 28, 2017 · Synced Jul 21, 2026, 6:07 PM EDT
Completed Early Phase 1 Interventional

NAC Trial for Anosmia

NCT02481609
View directory record Official record
Conditions
Anosmia
Interventions
N-acetyl cysteine (NAC)
Drug
Lead sponsor
University of Miami
Other
Eligibility
18 Years and older
Enrollment
29 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Mar 19, 2018 · Synced Jul 21, 2026, 6:07 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Experiments to Test How and Why the Sense of Smell Differs Between People

NCT00220038
View directory record Official record
Conditions
Specific Anosmias
Interventions
smell tests
Behavioral
Lead sponsor
Rockefeller University
Other
Eligibility
18 Years and older
Enrollment
500 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2010
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jan 10, 2012 · Synced Jul 21, 2026, 6:07 PM EDT
Completed Not applicable Interventional

Intranasal Injection of PRP Versus Saline for Treatment of Olfactory Dysfunction

NCT04406584
View directory record Official record
Conditions
Olfactory Disorder, Olfaction Disorders, Olfactory Nerve Injuries, Olfactory Nerve Disorder, Olfactory Nerve Diseases, Covid19, Post-Viral Disorder
Interventions
Injection into olfactory cleft
Procedure
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
2
States / cities
San Diego, California • Stanford, California
Source: ClinicalTrials.gov public record
Updated Mar 12, 2023 · Synced Jul 21, 2026, 6:07 PM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Longitudinal At Home Smell Testing to Detect Infection by SARS-CoV-2

NCT05040659
View directory record Official record
Conditions
Anosmia, Asymptomatic COVID-19, COVID-19 Respiratory Infection, Influenza, Healthy, PASC Post Acute Sequelae of COVID 19
Interventions
AROMHA Longitudinal Smell Test
Device
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 100 Years
Enrollment
1,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 5, 2026 · Synced Jul 21, 2026, 6:07 PM EDT
Not listed Phase 4 Interventional

A Study Assessing Change in Sense of Smell After Rasagiline Use in Parkinson's Patients

NCT01007630
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Rasagiline, Placebo
Drug
Lead sponsor
The Parkinson's Institute
Other
Eligibility
Up to 90 Years
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
1
States / cities
Sunnyvale, California
Source: ClinicalTrials.gov public record
Updated Dec 1, 2013 · Synced Jul 21, 2026, 6:07 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Stellate Ganglion Block for COVID-19-Induced Olfactory Dysfunction

NCT05445921
View directory record Official record
Conditions
Anosmia, Hyposmia, Parosmia, Olfactory Disorder
Interventions
Stellate Ganglion Block
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 70 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Feb 11, 2026 · Synced Jul 21, 2026, 6:07 PM EDT
Recruiting No phase listed Observational

Olfactory Cleft Obstruction and Electrophysiological Field Potentials Predict Olfactory Restoration by Dupilumab in CRSwNP Patients.

NCT06892704
View directory record Official record
Conditions
Chronic Rhinosinusitis Phenotype With Nasal Polyps (CRSwNP), Smell Loss
Interventions
Dupilumab - Standard Dose
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 15, 2026 · Synced Jul 21, 2026, 6:07 PM EDT
Withdrawn Phase 2 Interventional

Trial of Directed High-dose Nasal Steroids on Residual Smell Loss in Sinus Patients After Sinus Surgery

NCT01814618
View directory record Official record
Conditions
Olfaction Disorders, Sinusitis, Paranasal Sinus Diseases
Interventions
Budesonide Respules
Drug
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 84 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 5, 2016 · Synced Jul 21, 2026, 6:07 PM EDT
Terminated Phase 3 Interventional Results available

NAC for Head Trauma-induced Anosmia

NCT03680911
View directory record Official record
Conditions
Anosmia, Head Trauma
Interventions
N Acetyl Cysteine, Placebo oral capsule
Drug
Lead sponsor
University of Miami
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Feb 3, 2021 · Synced Jul 21, 2026, 6:07 PM EDT
Enrolling by invitation No phase listed Observational Accepts healthy volunteers

Longitudinal Deep Phenotyping of Central Mechanisms in Dysosmia: A Pilot Study Using Electrobulbogram (EBG), Functional MRI (fMRI), and Diffusion-Weighted Imaging (DWI)

NCT07149428
View directory record Official record
Conditions
Respiratory Tract Infection, Smell Disorder, Influenza, Rhinosinusitis, COVID-19, Depression, Parosmia, Hyposomia, Normosomia, Anosmia
Interventions
Not listed
Lead sponsor
National Institute on Deafness and Other Communication Disorders (NIDCD)
NIH
Eligibility
18 Years to 99 Years
Enrollment
80 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2029
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 20, 2026 · Synced Jul 21, 2026, 6:07 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Impact of Methadone Maintenance Therapy on Food Reward Processing in Opioid Dependence

NCT03575273
View directory record Official record
Conditions
Opioid Dependence, Obesity
Interventions
Sniffin' Sticks Odor Identification and Hedonic Scale, Sucrose Taste Preference Assessment, Food Preferences Task, Progressive Ratio (PR) Task, Clinical Electrophysiology, Standardized Meal and Hunger and Satiety Ratings
Behavioral · Procedure · Dietary Supplement
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 60 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
2
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Dec 15, 2020 · Synced Jul 21, 2026, 6:07 PM EDT
Active, not recruiting No phase listed Observational

Early Longitudinal Imaging in Parkinson's Progression Markers Initiative Using [¹⁸F] AV-133 and DaTscan™

NCT04507139
View directory record Official record
Conditions
Parkinson Disease
Interventions
Not listed
Lead sponsor
Michael J. Fox Foundation for Parkinson's Research
Other
Eligibility
30 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2025
U.S. locations
3
States / cities
New Haven, Connecticut • Boston, Massachusetts • Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 30, 2024 · Synced Jul 21, 2026, 6:07 PM EDT
Completed Phase 2 Interventional Results available

Directed Topical Drug Delivery for Treatment for PASC Hyposmia

NCT05970731
View directory record Official record
Conditions
Post Acute Sequelae Covid-19 Hyposmia
Interventions
Beclomethasone, Placebo, Microsponge
Drug · Other · Device
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 18, 2026 · Synced Jul 21, 2026, 6:07 PM EDT
Not yet recruiting No phase listed Observational

In Vivo Imaging of the Olfactory Epithelium Using Confocal Laser Endomicroscopy

NCT07546617
View directory record Official record
Conditions
Endonasal Surgery, Endoscopic Sinus Surgery, Olfactory Dysfunction
Interventions
CONVIVO system, Conventional histologic evaluation, Fluorescein injection, USP 10%
Device · Other · Drug
Lead sponsor
Dartmouth-Hitchcock Medical Center
Other
Eligibility
18 Years and older
Enrollment
36 participants
Timeline
2026 – 2027
U.S. locations
1
States / cities
Lebanon, New Hampshire
Source: ClinicalTrials.gov public record
Updated Apr 22, 2026 · Synced Jul 21, 2026, 6:07 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Physiological Effects of Androstadienone Exposure

NCT00553384
View directory record Official record
Conditions
Healthy
Interventions
Not listed
Lead sponsor
Rockefeller University
Other
Eligibility
18 Years to 35 Years · Female only
Enrollment
68 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2010
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 19, 2012 · Synced Jul 21, 2026, 6:07 PM EDT
Completed Phase 2 Interventional Results available

COVID-19 Anosmia Study

NCT04495816
View directory record Official record
Conditions
Anosmia, Covid19
Interventions
Omega-3 Fatty Acid Supplement, Placebo/Control
Drug
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years and older
Enrollment
139 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 Oct 22, 2023 · Synced Jul 21, 2026, 6:07 PM EDT
Not yet recruiting Phase 2 Interventional

Study of Chemosensory Enhancement Through Neuromodulation Training (SCENT): Open Label

NCT07689773
View directory record Official record
Conditions
Olfactory Impairment
Interventions
Trigeminal Nerve Stimulation-enhanced Smell Training
Combination Product
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 80 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Jul 8, 2026 · Synced Jul 21, 2026, 6:07 PM EDT
Completed Not applicable Interventional

Multimodal Investigation of Post COVID-19 in Females

NCT05225220
View directory record Official record
Conditions
Post COVID-19, Cognitive Dysfunction
Interventions
Parasym Device (of Parasym Ltd, UK) using Transcutaneous Vagus Nerve Stimulation (t-VNS)
Device
Lead sponsor
Casa Colina Hospital and Centers for Healthcare
Other
Eligibility
18 Years to 85 Years · Female only
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Pomona, California
Source: ClinicalTrials.gov public record
Updated Jul 6, 2023 · Synced Jul 21, 2026, 6:07 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers

Sensory Enrichment for Older Adults

NCT03914989
View directory record Official record
Conditions
Cognitive Function
Interventions
olfactory enrichment (essential oils)
Other
Lead sponsor
University of California, Irvine
Other
Eligibility
60 Years to 85 Years
Enrollment
110 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Irvine, California
Source: ClinicalTrials.gov public record
Updated Mar 23, 2023 · Synced Jul 21, 2026, 6:07 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Cognitive and Immunologic Profiles of Patients With Olfactory Dysfunction After Smell Training

NCT07681973
View directory record Official record
Conditions
Smell Loss, Chronic Rhinosinusitis (CRS)
Interventions
Smell Training
Other
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years and older
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 1, 2026 · Synced Jul 21, 2026, 6:07 PM EDT