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ClinicalTrials.gov public records Last synced Oct 17, 2026, 5:32 AM EDT

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Showing 25–48 of 136 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Carbidopa Clear all
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 17, 2026, 5:32 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 17, 2026, 5:32 AM EDT
Not listed Phase 3 Interventional

A Study of AP-CD/LD in Fluctuating Parkinson's Disease Patients Who Completed IN 11 004

NCT02615873
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Accordion Pill™ Carbidopa/Levodopa
Drug
Lead sponsor
Intec Pharma Ltd.
Industry
Eligibility
30 Years to 100 Years
Enrollment
460 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
37
States / cities
Birmingham, Alabama • Phoenix, Arizona • Sun City, Arizona + 33 more
Source: ClinicalTrials.gov public record
Updated Aug 14, 2018 · Synced Oct 17, 2026, 5:32 AM 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Withdrawn Phase 2 Interventional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 Oct 17, 2026, 5:32 AM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Sustained Release Oral Formulation for Treatment of Parkinson's Disease

NCT05471609
View directory record Official record
Conditions
Healthy Volunteers
Interventions
levodopa/carbidopa oral formulation A, levodopa/carbidopa oral formulation B
Drug
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years to 65 Years
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Jun 25, 2026 · Synced Oct 17, 2026, 5:32 AM 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 17, 2026, 5:32 AM 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 Oct 17, 2026, 5:32 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 17, 2026, 5:32 AM EDT
Completed Phase 2 Interventional

Comparison of IPX054 and Immediate-Release Carbidopa-Levodopa in Patients With Parkinson's Disease

NCT00253084
View directory record Official record
Conditions
Parkinson's Disease
Interventions
IPX054 200 mg, CD-LD IR, IPX054 Placebo, CD-LD IR Placebo
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
Chicago, Illinois • Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Oct 29, 2019 · Synced Oct 17, 2026, 5:32 AM EDT
Completed Phase 2 Interventional Results available

Pilot Study to Evaluate Levodopa as Treatment for Residual Amblyopia

NCT00789672
View directory record Official record
Conditions
Amblyopia
Interventions
levodopa/carbidopa, patching
Drug · Device
Lead sponsor
Jaeb Center for Health Research
Other
Eligibility
8 Years to 17 Years
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 13, 2016 · Synced Oct 17, 2026, 5:32 AM EDT
Completed Phase 2Phase 3 Interventional

A Long-Term, Safety Study With a Flexible Dose Range of KW-6002 in Patients With Motor Response Complications on Levodopa/Carbidopa Therapy

NCT00955045
View directory record Official record
Conditions
Parkinson's Disease
Interventions
istradefylline
Drug
Lead sponsor
Kyowa Kirin, Inc.
Industry
Eligibility
30 Years and older
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 17, 2026, 5:32 AM EDT
Completed Phase 3 Interventional Results available

Study Comparing Continuous Subcutaneous Infusion Of ABBV-951 With Oral Carbidopa/Levodopa Tablets For Treatment Of Motor Fluctuations In Adult Participants With Advanced Parkinson's Disease

NCT04380142
View directory record Official record
Conditions
Parkinson's Disease (PD)
Interventions
ABBV-951, Placebo for Levodopa/Carbidopa (LD/CD), Levodopa/Carbidopa (LD/CD), Placebo for ABBV-951
Drug
Lead sponsor
AbbVie
Industry
Eligibility
30 Years and older
Enrollment
174 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
70
States / cities
Birmingham, Alabama • Mobile, Alabama • Phoenix, Arizona + 62 more
Source: ClinicalTrials.gov public record
Updated Nov 18, 2022 · Synced Oct 17, 2026, 5:32 AM EDT
Completed Phase 2 Interventional Results available

Dose Ranging Study of Carbidopa-levodopa

NCT03023059
View directory record Official record
Conditions
Age-related Macular Degeneration
Interventions
Carbidopa-Levodopa, 25 Mg-100 Mg Oral Tablet
Drug
Lead sponsor
Snyder, Robert W., M.D., Ph.D., P.C.
Individual
Eligibility
50 Years to 85 Years
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Sep 12, 2025 · Synced Oct 17, 2026, 5:32 AM EDT
Completed Phase 3 Interventional Results available

Levodopa for the Treatment of Residual Amblyopia

NCT01190813
View directory record Official record
Conditions
Amblyopia
Interventions
Levodopa/Carbidopa, Placebo, Patching
Drug · Other
Lead sponsor
Jaeb Center for Health Research
Other
Eligibility
7 Years to 12 Years
Enrollment
139 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jun 2, 2016 · Synced Oct 17, 2026, 5:32 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 17, 2026, 5:32 AM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Imaging the Neurobiology of Behavioral and Medication Treatment for Cocaine Dependence

NCT01468012
View directory record Official record
Conditions
Cocaine Dependence
Interventions
levodopa carbidopa and entacapone (LCE), Placebo
Drug
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
21 Years to 50 Years
Enrollment
23 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2015
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 22, 2018 · Synced Oct 17, 2026, 5:32 AM EDT
Completed Phase 4 Interventional Results available

Apokyn for Motor IMProvement of Morning AKinesia Trial (AM IMPAKT)

NCT01770145
View directory record Official record
Conditions
Parkinson's Disease, Motor Symptoms, Akinesia, Hypomobility, Delayed Levodopa Onset
Interventions
APOKYN, L-dopa, Trimethobenzamide
Drug
Lead sponsor
MDD US Operations, LLC a subsidiary of Supernus Pharmaceuticals
Industry
Eligibility
18 Years and older
Enrollment
127 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
12
States / cities
Los Angeles, California • Reseda, California • Washington D.C., District of Columbia + 9 more
Source: ClinicalTrials.gov public record
Updated Aug 14, 2023 · Synced Oct 17, 2026, 5:32 AM 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 Oct 17, 2026, 5:32 AM 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 17, 2026, 5:32 AM EDT
Withdrawn Phase 2 Interventional

A Safety and Efficacy Study of Carbidopa-levodopa in Patients With Macular Degeneration

NCT02873351
View directory record Official record
Conditions
Age-related Macular Degeneration
Interventions
carbidopa-levodopa 25-100 mg, placebo for carbidopa-levodopa 25-100 mg
Drug
Lead sponsor
Snyder, Robert W., M.D., Ph.D., P.C.
Individual
Eligibility
50 Years to 85 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Apr 5, 2019 · Synced Oct 17, 2026, 5:32 AM EDT
Completed Phase 3 Interventional Results available

Efficacy and Safety of Carbidopa/Levodopa/Entacapone in Patients With Parkinson's Disease Requiring Initiation of Levodopa Therapy

NCT00099268
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Carbidopa/levodopa/entacapone, Immediate release carbidopa/levodopa
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
30 Years to 70 Years
Enrollment
747 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2008
U.S. locations
31
States / cities
Birmingham, Alabama • Scottsdale, Arizona • La Jolla, California + 25 more
Source: ClinicalTrials.gov public record
Updated Apr 23, 2012 · Synced Oct 17, 2026, 5:32 AM EDT
Completed Phase 4 Interventional

Istradefylline Effect Protocol on Parkinson's Disease Tremor

NCT05885360
View directory record Official record
Conditions
Parkinson Disease, Tremor
Interventions
Istradefylline Pill
Drug
Lead sponsor
Georgetown University
Other
Eligibility
18 Years and older
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
McLean, Virginia
Source: ClinicalTrials.gov public record
Updated Mar 13, 2025 · Synced Oct 17, 2026, 5:32 AM EDT
Completed Phase 1 Interventional

Treatment of Orthostatic Hypotension in Autonomic Failure

NCT00223691
View directory record Official record
Conditions
Autonomic Failure, Orthostatic Hypotension
Interventions
Atomoxetine, Acarbose, Pyridostigmine Bromide, Yohimbine, Midodrine HCl, placebo, Modafinil, Octreotide, water intake, Diphenhydramine Hydrochloride, Ranitidine HCL, Tranylcypromine, Ergotamine/ Caffeine, Celecoxib, Pseudoephedrine, Methylphenidate, Indomethacin, Ibuprofen, Oxymetazoline 0.05% nasal solution, Bovril, Acetazolamide, Rivastigmine tartrate, Carbidopa/levodopa, Inflatable abdominal binder, inflatable abdominal binder (sham)
Drug · Other · Dietary Supplement + 1 more
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 85 Years
Enrollment
389 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2017
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 18, 2017 · Synced Oct 17, 2026, 5:32 AM EDT
Completed Phase 1 Interventional

PF 06412562 in Subjects With Advanced Stage Parkinson's Disease

NCT03665454
View directory record Official record
Conditions
Parkinson Disease
Interventions
PF-06412562, Standard of Care Placebo
Drug
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
Not listed
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
1
States / cities
Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 31, 2019 · Synced Oct 17, 2026, 5:32 AM EDT