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ClinicalTrials.gov public records Last synced Sep 30, 2026, 6:49 PM EDT

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Showing 25–48 of 124 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Levodopa / Carbidopa Clear all
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 Sep 30, 2026, 6:49 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Levodopa for Diabetic Retinopathy

NCT07444892
View directory record Official record
Conditions
Diabetic Retinopathy
Interventions
Levodopa, Placebo
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
230 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Decatur, Georgia
Source: ClinicalTrials.gov public record
Updated Mar 3, 2026 · Synced Sep 30, 2026, 6:49 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 Sep 30, 2026, 6:49 PM EDT
Suspended Early Phase 1 Interventional Accepts healthy volunteers

Changes in Glutamatergic Neurotransmission of Severe TBI Patients

NCT04244058
View directory record Official record
Conditions
Disorder of Consciousness, Traumatic Brain Injury
Interventions
Amantadine + L-DOPA, NMDA blocker
Drug
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years to 75 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Sep 30, 2022 · Synced Sep 30, 2026, 6:49 PM EDT
Completed Phase 3 Interventional

A Study of Istradefylline (KW-6002) in Treating Patients With Parkinson's Disease on Levodopa

NCT00199420
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Istradefylline (KW-6002)
Drug
Lead sponsor
Kyowa Kirin, Inc.
Industry
Eligibility
30 Years and older
Enrollment
580 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2005
U.S. locations
2
States / cities
Princeton, New Jersey
Source: ClinicalTrials.gov public record
Updated Apr 25, 2024 · Synced Sep 30, 2026, 6:49 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 Sep 30, 2026, 6:49 PM EDT
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 Sep 30, 2026, 6:49 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Dopaminergic Enhancement of Rehabilitation Therapy Early After Stroke

NCT05369533
View directory record Official record
Conditions
Stroke
Interventions
Telerehabilitation, Sinemet Pill, Placebo
Device · Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 24, 2025 · Synced Sep 30, 2026, 6:49 PM EDT
Completed Phase 1 Interventional

Pharmacological Agents for Chronic Spinal Cord Injury (SCI)

NCT05708274
View directory record Official record
Conditions
Spinal Cord Injuries
Interventions
CPH + hand training, CD-LD + hand training, ATX + hand training, Placebo + hand training
Drug
Lead sponsor
Bronx VA Medical Center
Federal
Eligibility
18 Years to 65 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Dec 8, 2025 · Synced Sep 30, 2026, 6:49 PM EDT
Completed Phase 3 Interventional

Study To Assess Adverse Events and Change in Disease Activity Of 24-hour Continuous Subcutaneous Infusion Of ABBV-951 In Adult Participants With Advanced Parkinson's Disease

NCT04750226
View directory record Official record
Conditions
Parkinson's Disease (PD)
Interventions
ABBV-951
Drug
Lead sponsor
AbbVie
Industry
Eligibility
30 Years and older
Enrollment
118 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
47
States / cities
Birmingham, Alabama • Mobile, Alabama • Phoenix, Arizona + 41 more
Source: ClinicalTrials.gov public record
Updated Jun 1, 2026 · Synced Sep 30, 2026, 6:49 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 Sep 30, 2026, 6:49 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 Sep 30, 2026, 6:49 PM EDT
Completed Phase 1 Interventional

A Study of the Pharmacokinetics, Pharmacodynamics, and Safety of Opicapone in Subjects With Parkinson's Disease Taking Levodopa.

NCT03496870
View directory record Official record
Conditions
Parkinson Disease
Interventions
Opicapone, Carbidopa Levodopa
Drug
Lead sponsor
Neurocrine Biosciences
Industry
Eligibility
18 Years to 85 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
3
States / cities
Glendale, California • Long Beach, California • Farmington Hills, Michigan
Source: ClinicalTrials.gov public record
Updated Mar 22, 2019 · Synced Sep 30, 2026, 6:49 PM EDT
Completed Phase 2 Interventional Results available

Cognitive Remediation for Cocaine Dependence

NCT01393457
View directory record Official record
Conditions
Cocaine Dependence
Interventions
levodopa/carbidopa, Ropinirole 2 mg/d, Placebo, Ropinirole 4 mg/d
Drug
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years to 55 Years
Enrollment
119 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2017
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 29, 2018 · Synced Sep 30, 2026, 6:49 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 Sep 30, 2026, 6:49 PM EDT
Completed Phase 3 Interventional Results available

Study of Efficacy, Safety and Tolerability of Levodopa-Carbidopa Intestinal Gel in Levodopa-Responsive Parkinson's Subjects

NCT00357994
View directory record Official record
Conditions
Advanced Parkinson's Disease
Interventions
Levodopa carbidopa intestinal gel (LCIG), Placebo gel, Levodopa carbidopa (LC) oral encapsulated immediate release (IR) tablets, Placebo (PBO) oral capsules, 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
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
8
States / cities
Los Angeles, California • Englewood, Colorado • Washington D.C., District of Columbia + 5 more
Source: ClinicalTrials.gov public record
Updated Jan 16, 2015 · Synced Sep 30, 2026, 6:49 PM EDT
Recruiting Phase 4 Interventional

Personalized Real-Time DBS and PD Mechanisms

NCT06013956
View directory record Official record
Conditions
Parkinson Disease
Interventions
Neurostimulation, Carbidopa 25/Levodopa 100Mg Tab
Device · Drug
Lead sponsor
David Escobar
Other
Eligibility
18 Years to 80 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2028
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 20, 2026 · Synced Sep 30, 2026, 6:49 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 Sep 30, 2026, 6:49 PM EDT
Withdrawn Phase 2 Interventional

Use of Zolpidem in Parkinson's Disease

NCT01351168
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Levodopa, Zolpidem first dose, Zolpidem second dose, sugar pill
Drug
Lead sponsor
Rush University Medical Center
Other
Eligibility
30 Years to 75 Years
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 3, 2012 · Synced Sep 30, 2026, 6:49 PM EDT
Completed Phase 1 Interventional

Study to Assess How ABBV-951 is Absorbed When Administered at Different Subcutaneous Sites of Adult Participants With Parkinson's Disease

NCT05094050
View directory record Official record
Conditions
Parkinson's Disease
Interventions
ABBV-951
Drug
Lead sponsor
AbbVie
Industry
Eligibility
30 Years and older
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
10
States / cities
Aurora, Colorado • Washington D.C., District of Columbia • Chicago, Illinois + 7 more
Source: ClinicalTrials.gov public record
Updated Mar 24, 2023 · Synced Sep 30, 2026, 6:49 PM EDT
Completed Phase 2 Interventional

A Study to Assess the PK and Pharmacodynamics of IPX203 in Patients With Advanced Parkinson's Disease

NCT02271503
View directory record Official record
Conditions
Parkinson's Disease
Interventions
CD-LD IR, IPX203 180 mg, IPX203 270 mg, Rytary 195 mg, Rytary 145 mg
Drug
Lead sponsor
Impax Laboratories, LLC
Industry
Eligibility
40 Years and older
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
11
States / cities
Phoenix, Arizona • Little Rock, Arkansas • Fountain Valley, California + 8 more
Source: ClinicalTrials.gov public record
Updated Nov 6, 2019 · Synced Sep 30, 2026, 6:49 PM EDT
Completed Phase 2 Interventional Results available

Carbidopa/Levodopa Combined With Behavioral Therapy for the Treatment of Cocaine Dependence

NCT00713583
View directory record Official record
Conditions
Cocaine Dependence
Interventions
levodopa, Placebo, Cognitive Behavioral Therapy, Contingency Management
Drug · Behavioral
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years to 60 Years
Enrollment
85 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Apr 23, 2018 · Synced Sep 30, 2026, 6:49 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Neurobiological Drivers of Mobility Resilience: The Dopaminergic System

NCT04325503
View directory record Official record
Conditions
Parkinsonian Signs in Older Persons
Interventions
carbidopa
Drug
Lead sponsor
University of Michigan
Other
Eligibility
60 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2022
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Apr 4, 2024 · Synced Sep 30, 2026, 6:49 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 Sep 30, 2026, 6:49 PM EDT