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ClinicalTrials.gov public records Last synced Oct 20, 2026, 4:51 PM EDT

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Showing 1–24 of 66 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Smell Loss Clear all
Completed Phase 2 Interventional Results available

Stellate Ganglion Block for COVID-induced Parosmia

NCT06253806
View directory record Official record
Conditions
COVID-19-Induced Parosmia
Interventions
Stellate Ganglion Block, Placebo Sham Injection
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 70 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Nov 10, 2025 · Synced Oct 20, 2026, 4:51 PM EDT
Terminated Phase 1Phase 2 Interventional Results available

Treatment of Pediatric Patients That Lost Sense of Smell Due to COVID-19

NCT04964414
View directory record Official record
Conditions
Dysosmia, Anosmia, Covid19
Interventions
Smell Retraining, Budesonide
Other · Drug
Lead sponsor
Amanda Stapleton
Other
Eligibility
6 Years to 21 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 13, 2024 · Synced Oct 20, 2026, 4:51 PM EDT
Recruiting No phase listed Observational

NIDCD Otolaryngology Clinical Protocol Biospecimen Bank

NCT06303180
View directory record Official record
Conditions
Hearing Loss, Head and Neck Neoplasms, Hearing Disorders, Laryngeal Disease
Interventions
Not listed
Lead sponsor
National Institute on Deafness and Other Communication Disorders (NIDCD)
NIH
Eligibility
3 Years to 99 Years
Enrollment
1,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2033
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 5, 2026 · Synced Oct 20, 2026, 4:51 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 13, 2023 · Synced Oct 20, 2026, 4:51 PM EDT
Not listed Not applicable Interventional

"Platelet Rich Plasma for the Management of Post-Viral Olfactory Dysfunction.

NCT05666492
View directory record Official record
Conditions
Olfactory Disorder, Olfaction Disorders
Interventions
Platelet rich plasma, Saline
Other
Lead sponsor
Thomas Jefferson University
Other
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 27, 2022 · Synced Oct 20, 2026, 4:51 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 23, 2023 · Synced Oct 20, 2026, 4:51 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Olfactory Transcranial Focused Ultrasound

NCT07658365
View directory record Official record
Conditions
Healthy, Olfaction
Interventions
transcranial focused ultrasound (tFUS)
Device
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years to 65 Years
Enrollment
28 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Oct 6, 2026 · Synced Oct 20, 2026, 4:51 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Steroid Nasal Irrigation for Flavor Evaluation and Detection Study

NCT02985515
View directory record Official record
Conditions
Olfactory Disorder
Interventions
Smell training
Behavioral
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 70 Years
Enrollment
51 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Nov 4, 2022 · Synced Oct 20, 2026, 4:51 PM EDT
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 5, 2019 · Synced Oct 20, 2026, 4:51 PM EDT
Completed Phase 2 Interventional Results available

Helping Olfaction and Nutrition On Renal Replacement

NCT02479451
View directory record Official record
Conditions
End Stage Renal Disease, Olfactory Disorders
Interventions
Theophylline
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2022
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 9, 2024 · Synced Oct 20, 2026, 4:51 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 20, 2018 · Synced Oct 20, 2026, 4:51 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 4, 2021 · Synced Oct 20, 2026, 4:51 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 4, 2025 · Synced Oct 20, 2026, 4:51 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Chemosensory Dysfunction and Recovery in Endoscopic Endonasal Skull Base Surgery

NCT05912881
View directory record Official record
Conditions
Anosmia, Skull Base Neoplasms
Interventions
Olfactory training, Placebo training
Other
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years and older
Enrollment
41 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 18, 2026 · Synced Oct 20, 2026, 4:51 PM EDT
Terminated Phase 1 Interventional Accepts healthy volunteers

Evaluate a Medication on How Hunger and Appetite Are Influenced by Smell

NCT01021176
View directory record Official record
Conditions
Food Intake
Interventions
Placebo spray, Diltiazem
Other · Drug
Lead sponsor
Pennington Biomedical Research Center
Other
Eligibility
18 Years to 60 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009
U.S. locations
1
States / cities
Baton Rouge, Louisiana
Source: ClinicalTrials.gov public record
Updated Dec 18, 2015 · Synced Oct 20, 2026, 4:51 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

PPMI Clinical - Establishing a Deeply Phenotyped PD Cohort

NCT04477785
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
4,500 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2033
U.S. locations
30
States / cities
Birmingham, Alabama • Phoenix, Arizona • Scottsdale, Arizona + 25 more
Source: ClinicalTrials.gov public record
Updated Jul 27, 2026 · Synced Oct 20, 2026, 4:51 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 7, 2023 · Synced Oct 20, 2026, 4:51 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 20, 2012 · Synced Oct 20, 2026, 4:51 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Digital Accessible Remote Olfactory Mediated Health Assessments for Preclinical AD

NCT05881239
View directory record Official record
Conditions
Subjective Cognitive Concerns, Mild Cognitive Impairment, Mild Behavioral Impairment, Healthy Aging
Interventions
AROMHA Brain Health Test
Device
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 100 Years
Enrollment
250 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 6, 2026 · Synced Oct 20, 2026, 4:51 PM EDT
Completed Phase 2 Interventional Results available

Smell in Covid-19 and Efficacy of Nasal Theophylline

NCT04789499
View directory record Official record
Conditions
Covid19, Anosmia, Olfactory Disorder, Covid-19 Pandemic, SARS-CoV-2 Infection, Hyposmia, Ageusia, Hypogeusia
Interventions
Theophylline Powder, Placebo Comparator
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 70 Years
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated May 24, 2023 · Synced Oct 20, 2026, 4:51 PM EDT
Completed Phase 2 Interventional Results available

Smell Changes & Efficacy of Nasal Theophylline

NCT03990766
View directory record Official record
Conditions
Olfactory Disorder, Anosmia, Viral Infection, Theophylline Causing Adverse Effects in Therapeutic Use, Smell Disorder
Interventions
Theophylline, Saline Nasal
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 70 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Mar 31, 2022 · Synced Oct 20, 2026, 4:51 PM EDT
Recruiting No phase listed Observational

Collection of Clinical Data and Specimens for Research in Hearing, Balance, Taste, Smell, Voice, Speech, and Language Disorders.

NCT05670496
View directory record Official record
Conditions
Hearing Loss, Deafness
Interventions
Not listed
Lead sponsor
National Institute on Deafness and Other Communication Disorders (NIDCD)
NIH
Eligibility
2 Years to 99 Years
Enrollment
600 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2032
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 18, 2026 · Synced Oct 20, 2026, 4:51 PM EDT
Completed Not applicable Interventional

Cognitive and Affective Mechanisms Underlying an Olfactory Approach to Modify Cigarette Craving

NCT04902469
View directory record Official record
Conditions
Craving
Interventions
Pleasant Odor, Odor Blank
Behavioral
Lead sponsor
University of Pittsburgh
Other
Eligibility
18 Years to 49 Years
Enrollment
232 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 13, 2026 · Synced Oct 20, 2026, 4:51 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Investigating the Efficacy of OMT to Recover Olfactory Perception After COVID-19

NCT06766279
View directory record Official record
Conditions
Anosmia
Interventions
Osteopathic Manipulative Treatment, Sham treatment
Procedure
Lead sponsor
Burrell College of Health Sciences
Other
Eligibility
18 Years and older
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Las Cruces, New Mexico
Source: ClinicalTrials.gov public record
Updated Jan 9, 2025 · Synced Oct 20, 2026, 4:51 PM EDT