Independent directory Public ClinicalTrials.gov records United States
Clinical Trials Finder
Objective public record navigation
Search Results

Search by objective public record fields.

Search by query text, NCT ID, condition, intervention, sponsor, city, state, recruitment status, phase, study type, healthy volunteer eligibility, sex, or age. Results come from ClinicalTrials.gov. When the live registry is unavailable, a clearly labeled stored copy may be shown.

Clear filters

These results were retrieved from the live ClinicalTrials.gov registry. Filters and sort order apply to this result list.

ClinicalTrials.gov public records Last synced Oct 17, 2026, 9:31 PM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 169–192 of 253 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Levodopa Clear all
Completed No phase listed Observational Accepts healthy volunteers

How the Loss of Dopamine and Dopamine-Restoring Medicines Affect Movement Performance

NCT00040196
View directory record Official record
Conditions
Parkinson Disease
Interventions
Not listed
Lead sponsor
National Institute of Neurological Disorders and Stroke (NINDS)
NIH
Eligibility
21 Years and older
Enrollment
133 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2002 – 2009
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 2, 2017 · Synced Oct 17, 2026, 9:31 PM EDT
Completed No phase listed Observational

Clinical Laboratory Evaluation of Chronic Autonomic Failure

NCT03648905
View directory record Official record
Conditions
Parkinson's Disease, Multiple System Atrophy, Autonomic Failure
Interventions
13N-Ammonia, 18F-DOPA, 11C-Methylreboxetine (11C-MRB), 18F-Dopamine
Drug
Lead sponsor
National Institute of Neurological Disorders and Stroke (NINDS)
NIH
Eligibility
18 Years to 120 Years
Enrollment
89 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2026
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 16, 2026 · Synced Oct 17, 2026, 9:31 PM EDT
Recruiting Not applicable Interventional

Real-Time Levodopa Level Monitoring in Parkinson Disease

NCT04735627
View directory record Official record
Conditions
Parkinson Disease
Interventions
Levodopameter
Device
Lead sponsor
University of California, San Diego
Other
Eligibility
40 Years to 85 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2028
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Feb 11, 2025 · Synced Oct 17, 2026, 9:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Modulating Glucose Tolerance With Dietary Tyrosine

NCT03872557
View directory record Official record
Conditions
Glucose Tolerance
Interventions
Tyrosine (TYR) Supplementation
Dietary Supplement
Lead sponsor
Columbia University
Other
Eligibility
18 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 5, 2021 · Synced Oct 17, 2026, 9:31 PM EDT
Completed Phase 2 Interventional Results available

A Study to Evaluate SAGE-217 in Participants With Parkinson's Disease

NCT03000569
View directory record Official record
Conditions
Parkinson Disease
Interventions
SAGE-217, Levodopa, Antiparkinsonian Agent(s)
Drug
Lead sponsor
Biogen
Industry
Eligibility
40 Years to 75 Years
Enrollment
29 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
11
States / cities
Panorama City, California • Jacksonville, Florida • Miami, Florida + 7 more
Source: ClinicalTrials.gov public record
Updated Nov 29, 2023 · Synced Oct 17, 2026, 9:31 PM EDT
Terminated Phase 3 Interventional Results available

Safety and Tolerability of Tozadenant as Adjunctive Therapy in Levodopa-Treated Patients With Parkinson's Disease.

NCT03051607
View directory record Official record
Conditions
Idiopathic Parkinson Disease
Interventions
Tozadenant
Drug
Lead sponsor
Biotie Therapies Inc.
Industry
Eligibility
30 Years to 80 Years
Enrollment
66 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
31
States / cities
Phoenix, Arizona • Little Rock, Arkansas • Long Beach, California + 25 more
Source: ClinicalTrials.gov public record
Updated May 3, 2019 · Synced Oct 17, 2026, 9:31 PM EDT
Completed Phase 1Phase 2 Interventional

Pharmacokinetics and Pharmacodynamics of IPX054 in Subjects With Parkinson's Disease

NCT00239564
View directory record Official record
Conditions
Idiopathic Parkinson's Disease
Interventions
IPX054 100 mg, IPX054 150 mg, IPX054 200 mg, IPX054 250 mg, IPX054 300 mg
Drug
Lead sponsor
Impax Laboratories, LLC
Industry
Eligibility
30 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
2
States / cities
Sunnyvale, California • Lawrence, Kansas
Source: ClinicalTrials.gov public record
Updated Oct 29, 2019 · Synced Oct 17, 2026, 9:31 PM EDT
Completed No phase listed Observational

Observational, Long-term Extension Study for Participants of Prior VY-AADC01 Studies

NCT03733496
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Not listed
Lead sponsor
Neurocrine Biosciences
Industry
Eligibility
40 Years and older
Enrollment
14 participants
Timeline
2018 – 2023
U.S. locations
3
States / cities
San Francisco, California • Atlanta, Georgia • Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 22, 2023 · Synced Oct 17, 2026, 9:31 PM EDT
Not listed Phase 2 Interventional

A Study of Efficacy and Safety of Eltoprazine HCl for Treating Levodopa-induced Dyskinesia in Parkinson's Disease Patients

NCT02439125
View directory record Official record
Conditions
Parkinson's Disease, Dyskinesia
Interventions
Eltoprazine HCl, Placebo
Drug
Lead sponsor
Amarantus BioScience Holdings, Inc.
Industry
Eligibility
30 Years to 85 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Boca Raton, Florida
Source: ClinicalTrials.gov public record
Updated Apr 22, 2016 · Synced Oct 17, 2026, 9:31 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Effect of Dopamine on Diabetic Retinopathy

NCT02706977
View directory record Official record
Conditions
Diabetes
Interventions
Low Dose Sinemet CR, High Dose Sinemet CR, RETeval Electroretinogram (ERG) Testing, Contrast Sensitivity Testing, Visual Acuity Testing
Drug · Device · Other
Lead sponsor
Emory University
Other
Eligibility
18 Years to 80 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Oct 9, 2019 · Synced Oct 17, 2026, 9:31 PM EDT
Completed Phase 1 Interventional Results available

Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of PF-06649751 in Parkinson's Disease

NCT02224664
View directory record Official record
Conditions
Parkinson's Disease
Interventions
PF-06649751
Drug
Lead sponsor
Pfizer
Industry
Eligibility
30 Years to 80 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
16
States / cities
Fountain Valley, California • Long Beach, California • Englewood, Colorado + 10 more
Source: ClinicalTrials.gov public record
Updated Mar 27, 2017 · Synced Oct 17, 2026, 9:31 PM EDT
Not yet recruiting Phase 4 Interventional

Gastrointestinal Dopamine Decarboxylase and Levodopa Pharmacokinetics

NCT07793461
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Levodopa (L-dopa)
Drug
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
Not listed
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2027 – 2030
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 28, 2026 · Synced Oct 17, 2026, 9:31 PM EDT
Completed Phase 3 Interventional Results available

A Study To Evaluate The Safety And Efficacy Of IPX066 In Subjects With Parkinson's Disease

NCT00880620
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Placebo, IPX066 95 mg LD, IPX066 145 mg LD, IPX066 195 mg LD, IPX066 245 mg LD
Drug
Lead sponsor
Impax Laboratories, LLC
Industry
Eligibility
30 Years and older
Enrollment
381 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
27
States / cities
Birmingham, Alabama • Phoenix, Arizona • Garden Grove, California + 22 more
Source: ClinicalTrials.gov public record
Updated Oct 29, 2019 · Synced Oct 17, 2026, 9:31 PM EDT
Completed Phase 3 Interventional Results available

Safety/Efficacy Study of Levodopa-Carbidopa Intestinal Gel in Parkinson's Subjects

NCT00360568
View directory record Official record
Conditions
Dyskinesias, Parkinson's Disease, Severe Motor Fluctuations
Interventions
Levodopa-carbidopa intestinal gel, CADD-Legacy® 1400 ambulatory infusion pump, PEG tube, J-tube
Drug · Device
Lead sponsor
AbbVie (prior sponsor, Abbott)
Industry
Eligibility
30 Years and older
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
16
States / cities
Birmingham, Alabama • Fountain Valley, California • Los Angeles, California + 13 more
Source: ClinicalTrials.gov public record
Updated Jan 16, 2015 · Synced Oct 17, 2026, 9:31 PM EDT
Completed No phase listed Observational

Development of an Instrumented System to Measure Mobility in Parkinson's Disease

NCT01174758
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Not listed
Lead sponsor
Oregon Health and Science University
Other
Eligibility
50 Years to 80 Years
Enrollment
160 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Nov 3, 2014 · Synced Oct 17, 2026, 9:31 PM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Developing Objective Measures of Levodopa Induced Dyskinesia: (Study 1)

NCT00467597
View directory record Official record
Conditions
Dyskinesias, Movement Disorders, Parkinson Disease
Interventions
Levodopa (delivered intravenously)
Drug
Lead sponsor
US Department of Veterans Affairs
Federal
Eligibility
21 Years and older
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2013
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Nov 26, 2014 · Synced Oct 17, 2026, 9:31 PM EDT
Completed Not applicable Interventional Results available

PharmacoMRI of Parkinson Disease

NCT01528592
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Carbidopa-Levodopa
Drug
Lead sponsor
Northwestern University
Other
Eligibility
30 Years and older
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 3, 2018 · Synced Oct 17, 2026, 9:31 PM EDT
Completed Phase 2Phase 3 Interventional

Safety and Efficacy Study of SYN115 in Parkinson's Patients Using Levodopa to Treat End of Dose Wearing Off

NCT01283594
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Tozadenant (SYN115) 60 mg BID, Placebo, Levodopa (L-dopa), Tozadenant (SYN115) 120 mg BID, Tozadenant (SYN115) 180 mg BID, Tozadenant (SYN115) 240 mg BID
Drug
Lead sponsor
Biotie Therapies Inc.
Industry
Eligibility
30 Years to 80 Years
Enrollment
420 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
40
States / cities
Birmingham, Alabama • La Jolla, California • Loma Linda, California + 37 more
Source: ClinicalTrials.gov public record
Updated Jan 17, 2019 · Synced Oct 17, 2026, 9:31 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Levodopa Response and Gut Microbiome in Patients With Parkinson's Disease

NCT04956939
View directory record Official record
Conditions
Parkinson Disease
Interventions
Low dose levodopa, High dose levodopa
Drug
Lead sponsor
Rush University Medical Center
Other
Eligibility
40 Years to 80 Years
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2021
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 7, 2022 · Synced Oct 17, 2026, 9:31 PM EDT
Completed Phase 1Phase 2 Interventional

An Exploratory Study of XP21279 (With Lodosyn®) and Sinemet® in Parkinson's Disease Subjects

NCT00914602
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Sinemet 25-100 Oral Tablet, XP21279, Carbidopa Pill
Drug
Lead sponsor
XenoPort, Inc.
Industry
Eligibility
30 Years to 75 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
2
States / cities
Peoria, Arizona • Bingham Farms, Michigan
Source: ClinicalTrials.gov public record
Updated May 5, 2021 · Synced Oct 17, 2026, 9:31 PM EDT
Completed No phase listed Observational

Prospective Evaluation of Forceplate Measured Levodopa-Induced Dyskinesia

NCT00912977
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Not listed
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Sep 30, 2016 · Synced Oct 17, 2026, 9:31 PM EDT
Completed Not applicable Interventional Results available

Computational Modeling of 60 Hz Subthalamic Nucleus Deep Brain Stimulation for Gait Disorder in Parkinson's Disease

NCT04184791
View directory record Official record
Conditions
Parkinson Disease
Interventions
Deep Brain Stimulation
Device
Lead sponsor
Northwell Health
Other
Eligibility
21 Years to 80 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Great Neck, New York
Source: ClinicalTrials.gov public record
Updated Mar 15, 2024 · Synced Oct 17, 2026, 9:31 PM EDT
Completed Phase 3 Interventional Results available

Efficacy and Safety Study of CVT-301 In Parkinson's Disease Patients With OFF Episodes

NCT02240030
View directory record Official record
Conditions
Idiopathic Parkinson's Disease
Interventions
CVT-301 Low Dose, CVT-301 High Dose, Placebo
Drug · Other
Lead sponsor
Acorda Therapeutics
Industry
Eligibility
30 Years to 85 Years
Enrollment
351 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
55
States / cities
Scottsdale, Arizona • Fresno, California • Fullerton, California + 47 more
Source: ClinicalTrials.gov public record
Updated May 28, 2019 · Synced Oct 17, 2026, 9:31 PM EDT
Active, not recruiting Phase 3 Interventional

Efficacy, Safety and Tolerability Study of ND0612 vs. Oral Immediate Release Levodopa/Carbidopa (IR-LD/CD) in Subjects With Parkinson's Disease Experiencing Motor Fluctuations

NCT04006210
View directory record Official record
Conditions
Parkinson's Disease
Interventions
ND0612 Solution for SC infusion, Placebo for SC infusion, Oral IR-LD/CD, Placebo for Oral IR-LD/CD
Combination Product · Drug
Lead sponsor
NeuroDerm Ltd.
Industry
Eligibility
30 Years and older
Enrollment
381 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2027
U.S. locations
38
States / cities
Phoenix, Arizona • Little Rock, Arkansas • Los Angeles, California + 34 more
Source: ClinicalTrials.gov public record
Updated May 21, 2025 · Synced Oct 17, 2026, 9:31 PM EDT