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ClinicalTrials.gov public records Last synced Oct 25, 2026, 5:26 PM EDT

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Showing 97–120 of 253 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: levodopa Clear all
Not listed Phase 3 Interventional

A Study to Assess the Safety and Efficacy of the of the Gastric-retentive AP-CD/LD in Advanced Parkinson's Patients

NCT02605434
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Accordion Pill™ Carbidopa/Levodopa, Sinemet®, Placebo -AP-CD/LD, Placebo- Sinemet
Drug
Lead sponsor
Intec Pharma Ltd.
Industry
Eligibility
30 Years and older
Enrollment
420 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
36
States / cities
Birmingham, Alabama • Phoenix, Arizona • Fountain Valley, California + 32 more
Source: ClinicalTrials.gov public record
Updated Aug 8, 2019 · Synced Oct 25, 2026, 5:26 PM EDT
Terminated Early Phase 1 Interventional

The Use of Sensory or Motor Cues Using Electrical Stimulation to Reduce Gait Freezing in Patients With Parkinson Disease

NCT00762814
View directory record Official record
Conditions
Parkinson Disease
Interventions
Gait tests with and without the use of a tactile sensory cue (electrical stimulation using a TENS unit)
Device
Lead sponsor
Washington University School of Medicine
Other
Eligibility
50 Years to 80 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated May 11, 2018 · Synced Oct 25, 2026, 5:26 PM EDT
Completed No phase listed Observational

Influence of Theta Burst Stimulation and Carbidopa-Levodopa on Motor Performance in Stroke Patients

NCT00366184
View directory record Official record
Conditions
Stroke
Interventions
Not listed
Lead sponsor
National Institute of Neurological Disorders and Stroke (NINDS)
NIH
Eligibility
18 Years to 90 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2010
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 2, 2017 · Synced Oct 25, 2026, 5:26 PM EDT
Terminated Phase 2 Interventional Results available

A Study to Assess the Safety and Effectiveness of Pridopidine Compared to Placebo in the Treatment of Levodopa-Induced Dyskinesia in Patients With Parkinson's Disease

NCT03922711
View directory record Official record
Conditions
Parkinson Disease
Interventions
Pridopidine, Placebo
Drug
Lead sponsor
Prilenia
Industry
Eligibility
30 Years to 85 Years
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
33
States / cities
Birmingham, Alabama • Phoenix, Arizona • Scottsdale, Arizona + 27 more
Source: ClinicalTrials.gov public record
Updated Jul 1, 2022 · Synced Oct 25, 2026, 5:26 PM EDT
Not listed Phase 1Phase 2 Interventional

A Study of IBRF Disorders of Consciousness Advanced Care/MultiModal Care Protocol in Severe Disorders of Consciousness

NCT02696512
View directory record Official record
Conditions
Brain Injury
Interventions
Polypharmacy using FDA-approved products, Median Nerve Stimulation (MNS), Nutraceutical Supplementation, Standard of Care
Drug · Device · Dietary Supplement + 1 more
Lead sponsor
International Brain Research Foundation
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
1
States / cities
Edison, New Jersey
Source: ClinicalTrials.gov public record
Updated Sep 2, 2016 · Synced Oct 25, 2026, 5:26 PM EDT
Terminated Phase 3 Interventional Results available

Treating H. Pylori in Parkinson's Patients With Motor Fluctuations

NCT00664209
View directory record Official record
Conditions
Parkinson's Disease, Helicobacter Infections, Motor Fluctuations
Interventions
clartihromycin, amoxicillin, and omeprazole, placebo
Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
Male only
Enrollment
64 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Dec 2, 2017 · Synced Oct 25, 2026, 5:26 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Effect of Levodopa on Cardiovascular Autonomic Function in Parkinson's Disease

NCT05487300
View directory record Official record
Conditions
Parkinson Disease, Orthostatic Hypotension
Interventions
Autonomic testing on and off levodopa
Drug
Lead sponsor
University of Utah
Other
Eligibility
Not listed
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Dec 5, 2024 · Synced Oct 25, 2026, 5:26 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 25, 2026, 5:26 PM EDT
Completed Phase 1 Interventional

Sinemet for Spasticity and Function in Amyotrophic Lateral Sclerosis and Primary Lateral Sclerosis

NCT03929068
View directory record Official record
Conditions
Amyotrophic Lateral Sclerosis, Motor Neuron Disease
Interventions
carbidopa-levodopa, Placebo Oral Tablet
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 11, 2022 · Synced Oct 25, 2026, 5:26 PM EDT
Completed Phase 2 Interventional

12-Week, Double-Blind, Placebo-Controlled, Randomized Study of the Efficacy of 40 mg/Day KW-6002 in Parkinson's Disease Patients on Levodopa/Carbidopa

NCT00456586
View directory record Official record
Conditions
Parkinson's Disease
Interventions
KW-6002 (istradefylline)
Drug
Lead sponsor
Kyowa Kirin, Inc.
Industry
Eligibility
30 Years and older
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2003
U.S. locations
1
States / cities
Princeton, New Jersey
Source: ClinicalTrials.gov public record
Updated Apr 25, 2024 · Synced Oct 25, 2026, 5:26 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 25, 2026, 5:26 PM EDT
Completed Early Phase 1 Interventional

Short-term Effects of TOLCAPONE on Transthyretin Stability in Subjects With Leptomeningeal TTR Amyloidosis (ATTR)

NCT03591757
View directory record Official record
Conditions
Transthyretin Amyloidosis, Amyloidosis, Leptomeningeal, Transthyretin-Related
Interventions
Tolcapone
Drug
Lead sponsor
Boston University
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 14, 2019 · Synced Oct 25, 2026, 5:26 PM EDT
Completed Phase 2Phase 3 Interventional Results available

A Trial of Levodopa in Angelman Syndrome

NCT01281475
View directory record Official record
Conditions
Angelman Syndrome
Interventions
Levodopa, Placebo Oral Capsule
Drug
Lead sponsor
Wen-Hann Tan
Other
Eligibility
4 Years to 12 Years
Enrollment
67 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
7
States / cities
San Diego, California • San Francisco, California • Boston, Massachusetts + 4 more
Source: ClinicalTrials.gov public record
Updated Jul 15, 2020 · Synced Oct 25, 2026, 5:26 PM EDT
Terminated Phase 4 Interventional Results available

L-DOPA vs. Placebo for Depression and Psychomotor Slowing in Older Adults

NCT03761030
View directory record Official record
Conditions
Major Depressive Disorder, Dysthymia, Depression
Interventions
L-DOPA, Placebo Oral Tablet
Drug
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
60 Years and older
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 22, 2023 · Synced Oct 25, 2026, 5:26 PM EDT
Recruiting Phase 2 Interventional Accepts healthy volunteers

Improving Therapeutic Learning for PTSD

NCT04558112
View directory record Official record
Conditions
PTSD, Post Traumatic Stress Disorder
Interventions
L-DOPA, Placebo
Drug
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
21 Years to 50 Years · Female only
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
2
States / cities
Austin, Texas • Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Aug 30, 2023 · Synced Oct 25, 2026, 5:26 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Dopaminergic Dysfunction in Late-Life Depression

NCT04469959
View directory record Official record
Conditions
Late Life Depression, Cognitive Decline, Depressive Disorder, Treatment-Resistant, Levodopa, Gait Impairment
Interventions
L-Dopa, Placebo
Drug
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
60 Years and older
Enrollment
79 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
2
States / cities
Pittsburgh, Pennsylvania • Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 6, 2026 · Synced Oct 25, 2026, 5:26 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 25, 2026, 5:26 PM EDT
Completed Phase 3 Interventional Results available

A Study to Examine the Effect of Levodopa-Carbidopa Intestinal Gel (LCIG) Therapy Relative to That of Optimized Medical Treatment (OMT) on Non-motor Symptoms (NMS) Associated With Advanced Parkinson's Disease (PD)

NCT02549092
View directory record Official record
Conditions
Advanced Parkinson's Disease
Interventions
Optimized Medical Treatment, Levodopa-Carbidopa Intestinal Gel, Nasojejunal (NJ) tube, Percutaneous endoscopic gastrostomy with a jejunal (PEG-J) tube
Drug · Device
Lead sponsor
AbbVie
Industry
Eligibility
30 Years and older
Enrollment
89 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2022
U.S. locations
8
States / cities
Fountain Valley, California • Boca Raton, Florida • Jacksonville, Florida + 5 more
Source: ClinicalTrials.gov public record
Updated Nov 28, 2023 · Synced Oct 25, 2026, 5:26 PM EDT
Completed Phase 1 Interventional Results available

Study on Tolerability of Levodopa/Carbidopa in Children With Angelman Syndrome

NCT00829439
View directory record Official record
Conditions
Angelman Syndrome
Interventions
Levodopa/Carbidopa (4:1)
Drug
Lead sponsor
Boston Children's Hospital
Other
Eligibility
4 Years to 12 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 21, 2016 · Synced Oct 25, 2026, 5:26 PM EDT
Completed Phase 3 Interventional Results available

A Study To Evaluate The Safety And Efficacy Of IPX066 In Advanced Parkinson's Disease (ADVANCE-PD).

NCT00974974
View directory record Official record
Conditions
Parkinson's Disease
Interventions
IPX066, IR CD-LD
Drug
Lead sponsor
Impax Laboratories, LLC
Industry
Eligibility
30 Years and older
Enrollment
471 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
35
States / cities
Birmingham, Alabama • Phoenix, Arizona • Little Rock, Arkansas + 30 more
Source: ClinicalTrials.gov public record
Updated Aug 11, 2020 · Synced Oct 25, 2026, 5:26 PM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers Results available

1/2-Dopaminergic Dysfunction in Late-Life Depression (The D3 Study)

NCT04493320
View directory record Official record
Conditions
Depression, Cognitive Impairment, Gait Impairment
Interventions
Carbidopa/levodopa, Placebo
Drug
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
60 Years and older
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 22, 2023 · Synced Oct 25, 2026, 5:26 PM EDT
Recruiting Phase 4 Interventional

A Study of CREXONT (Carbidopa and Levodopa) Extended-Release Capsules in Participants With Parkinson's Disease

NCT06765668
View directory record Official record
Conditions
Parkinson Disease
Interventions
CREXONT ER
Drug
Lead sponsor
Impax Laboratories, LLC
Industry
Eligibility
18 Years and older
Enrollment
220 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
27
States / cities
Phoenix, Arizona • Little Rock, Arkansas • Aliso Viejo, California + 22 more
Source: ClinicalTrials.gov public record
Updated Aug 24, 2025 · Synced Oct 25, 2026, 5:26 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 25, 2026, 5:26 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Renal Salt Handling in Postural Tachycardia Syndrome Following Dietary Dopa Administration

NCT01064739
View directory record Official record
Conditions
Healthy Participants
Interventions
Fava beans, Fixed Sodium Diet
Dietary Supplement · Other
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 60 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2012
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated May 26, 2016 · Synced Oct 25, 2026, 5:26 PM EDT