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ClinicalTrials.gov public records Last synced Oct 2, 2026, 8:38 AM EDT

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Showing 1–24 of 24 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Levodopa/Carbidopa (4:1) Clear all
Suspended Phase 2Phase 3 Interventional

Effects of 5HTP and LDOPA on CNS Excitability After SCI

NCT04000919
View directory record Official record
Conditions
Spinal Cord Injuries
Interventions
5HTP, L-DOPA, Placebo oral tablet, Carbidopa
Drug
Lead sponsor
Jessica M D'Amico
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
Louisville, Kentucky
Source: ClinicalTrials.gov public record
Updated Oct 17, 2022 · Synced Oct 2, 2026, 8:38 AM 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 2, 2026, 8:38 AM EDT
Recruiting Phase 4 Interventional

Dopaminergic Therapy for Anhedonia - 2

NCT06075771
View directory record Official record
Conditions
Anhedonia, Depression
Interventions
Carbidopa Levodopa, Placebo
Drug
Lead sponsor
Emory University
Other
Eligibility
25 Years to 55 Years
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jan 28, 2026 · Synced Oct 2, 2026, 8:38 AM 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 2, 2026, 8:38 AM 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 2, 2026, 8:38 AM EDT
Active, not recruiting Phase 2 Interventional

Project 1 Aim 2, Adaptations of the Brain in Chronic Pain With Opioid Exposure

NCT05463367
View directory record Official record
Conditions
Opioid Use, Opioid Dependence, Opioid-use Disorder, Narcotic Use, Back Pain, Back Injuries, Chronic Pain, Chronic Low-back Pain, Pain, Chronic, Pain;Back Low;Chronic, Pain, Back
Interventions
Carbidopa-Levodopa 25 Mg-100 Mg Oral Tablet, Naproxen 500 Mg, Opioids
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2025
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 27, 2024 · Synced Oct 2, 2026, 8:38 AM EDT
Completed Phase 4 Interventional Results available

Effects of Carbidopa/Levodopa/Entacapone on Motor Function and Quality of Life in Patients With Parkinson's Disease

NCT00219284
View directory record Official record
Conditions
Parkinson's Disease With End of Dose Wearing Off
Interventions
Carbidopa/levodopa/entacapone
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
30 Years to 85 Years
Enrollment
359 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2008
U.S. locations
41
States / cities
Phoenix, Arizona • Fullerton, California • Irvine, California + 38 more
Source: ClinicalTrials.gov public record
Updated Mar 30, 2017 · Synced Oct 2, 2026, 8:38 AM EDT
Completed Phase 3 Interventional Results available

A Study to Evaluate the Safety and Efficacy of IPX203 in Parkinson's Disease Participants With Motor Fluctuations

NCT03670953
View directory record Official record
Conditions
Parkinson's Disease (Disorder)
Interventions
IR CD-LD, IPX203 ER CD-LD, Placebo Matching IPX203, Placebo Matching IR CD-LD
Drug · Other
Lead sponsor
Impax Laboratories, LLC
Industry
Eligibility
40 Years and older
Enrollment
630 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
56
States / cities
Phoenix, Arizona • Little Rock, Arkansas • Loma Linda, California + 46 more
Source: ClinicalTrials.gov public record
Updated Feb 9, 2023 · Synced Oct 2, 2026, 8:38 AM EDT
Completed Phase 2 Interventional

A Efficacy, Safety and Pharmacokinetic Study of XP21279 and Sinemet® in Parkinson's Disease Subjects

NCT01171313
View directory record Official record
Conditions
Parkinson's Disease
Interventions
XP21279 and carbidopa (experimental), Sinemet (comparator), Placebo for XP21279 and carbidopa, Placebo for Sinemet
Drug
Lead sponsor
XenoPort, Inc.
Industry
Eligibility
30 Years to 80 Years
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
12
States / cities
Phoenix, Arizona • Little Rock, Arkansas • Long Beach, California + 9 more
Source: ClinicalTrials.gov public record
Updated Feb 18, 2021 · Synced Oct 2, 2026, 8:38 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Medications for Stopping Cocaine Dependence and Preventing Relapse

NCT00218023
View directory record Official record
Conditions
Cocaine Abuse, Cocaine-Related Disorders
Interventions
Modafinil, Levodopa/Carbidopa, Naltrexone HCl, Placebo, Motivational Interviewing (MI), Contingency management (CM), Cognitive-Behavioral Therapy (CBT)
Drug · Behavioral
Lead sponsor
The University of Texas Health Science Center, Houston
Other
Eligibility
18 Years to 55 Years
Enrollment
101 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2012
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 9, 2017 · Synced Oct 2, 2026, 8:38 AM 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 2, 2026, 8:38 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Neurobiological Drivers of Mobility Resilience: The Dopaminergic System - Placebo-Controlled Arm

NCT06219915
View directory record Official record
Conditions
Parkinsonian Signs in Older Persons
Interventions
Carbidopa 25 mg, Carbidopa-Levodopa 25/100 mg, Placebo 1, Placebo 2
Drug
Lead sponsor
University of Michigan
Other
Eligibility
60 Years and older
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
2
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Jun 17, 2025 · Synced Oct 2, 2026, 8:38 AM EDT
Terminated Phase 4 Interventional Results available

Levodopa and Exercise for Older Adults With Depression and Psychomotor Slowing

NCT04650217
View directory record Official record
Conditions
Depressive Disorder
Interventions
Carbidopa/levodopa, Placebo, Exercise training, Control
Drug · Behavioral
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
60 Years to 100 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 2, 2023 · Synced Oct 2, 2026, 8:38 AM 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 Oct 2, 2026, 8:38 AM EDT
Completed Phase 2 Interventional

Comparison of IPX054, IR Carbidopa-Levodopa, and CR Carbidopa-Levodopa in Subjects With Parkinson's Disease

NCT00279825
View directory record Official record
Conditions
Idiopathic Parkinson's Disease
Interventions
IPX054 200 mg, IPX054 250 mg, CD-LD IR, CD-LD CR, IPX054 200 mg Placebo, IPX054 250 mg Placebo, CD-LD IR Placebo, CD-LD CR Placebo
Drug
Lead sponsor
Impax Laboratories, LLC
Industry
Eligibility
30 Years and older
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
2
States / cities
Bingham Farms, Michigan • Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Oct 29, 2019 · Synced Oct 2, 2026, 8:38 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Neurobiological Drivers of Mobility Resilience: The Dopaminergic System - Supplemental Open-Label Arm

NCT06587217
View directory record Official record
Conditions
Parkinsonian Signs in Older Persons
Interventions
Carbidopa 25 mg, Carbidopa-Levodopa 25/100 mg
Drug
Lead sponsor
University of Michigan
Other
Eligibility
60 Years and older
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
2
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Apr 14, 2026 · Synced Oct 2, 2026, 8:38 AM EDT
Completed Phase 1 Interventional

A Study of the Safety and Pharmacokinetics of Levodopa Following Administration of CVT 301 (Levodopa Inhalation Powder) in Adults With Asthma

NCT02633007
View directory record Official record
Conditions
Asthma
Interventions
CVT-301 (levodopa inhalation powder), Carbidopa, Placebo
Drug · Other
Lead sponsor
Acorda Therapeutics
Industry
Eligibility
25 Years to 65 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
3
States / cities
Daytona Beach, Florida • North Dartmouth, Massachusetts • Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Jun 13, 2016 · Synced Oct 2, 2026, 8:38 AM 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 2, 2026, 8:38 AM EDT
Completed Phase 4 Interventional Results available

Vigor and the LDR in Parkinson Disease

NCT04821830
View directory record Official record
Conditions
Parkinson Disease
Interventions
carbidopa/levodopa, as prescribed by treating physician
Drug
Lead sponsor
University of Michigan
Other
Eligibility
45 Years to 90 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Jul 18, 2025 · Synced Oct 2, 2026, 8:38 AM 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 Oct 2, 2026, 8:38 AM 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 2, 2026, 8:38 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Striatal Effective Connectivity to Predict Treatment Response in Cocaine Misuse

NCT02080819
View directory record Official record
Conditions
Cocaine Dependence
Interventions
levodopa/carbidopa 400/100 BID
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years to 50 Years
Enrollment
131 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2017
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Apr 12, 2018 · Synced Oct 2, 2026, 8:38 AM EDT
Completed Phase 4 Interventional Results available

DTA (Dopaminergic Therapy for Anhedonia) Study

NCT04723147
View directory record Official record
Conditions
Depression, Anhedonia
Interventions
Carbidopa Levodopa, Placebo
Drug
Lead sponsor
Emory University
Other
Eligibility
25 Years to 55 Years
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Dec 16, 2024 · Synced Oct 2, 2026, 8:38 AM EDT
Completed Phase 4 Interventional Results available

Effect of L-dopa In Subacute Back Pain Population

NCT01951105
View directory record Official record
Conditions
Sub-acute Back Pain
Interventions
Naproxen, Carbidopa/Levodopa, Placebo
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years and older
Enrollment
72 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 24, 2021 · Synced Oct 2, 2026, 8:38 AM EDT