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ClinicalTrials.gov public records Last synced Oct 4, 2026, 5:42 PM EDT

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Showing 49–72 of 124 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Carbidopa Levodopa Clear all
Withdrawn Phase 2 Interventional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 4, 2026, 5:42 PM 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 4, 2026, 5:42 PM EDT
Completed Phase 2 Interventional Results available

Extension, Carbidopa-levodopa in Neovascular Age-related Macular Degeneration (AMD)

NCT03197493
View directory record Official record
Conditions
Macula; Degeneration, Retina
Interventions
carbidopa-levodopa 25-100 mg
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 4, 2026, 5:42 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 4, 2026, 5:42 PM EDT
Completed Phase 3 Interventional Results available

Carbidopa-Levodopa (CD-LD) ER Alone or in Combination With CD-LD IR to IPX066 Followed by IPX066 Extension Safety Study

NCT01411137
View directory record Official record
Conditions
Parkinson's Disease
Interventions
IPX066
Drug
Lead sponsor
Impax Laboratories, LLC
Industry
Eligibility
30 Years and older
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
8
States / cities
Birmingham, Alabama • La Jolla, California • Sunnyvale, California + 5 more
Source: ClinicalTrials.gov public record
Updated Nov 7, 2019 · Synced Oct 4, 2026, 5:42 PM EDT
Completed Phase 3 Interventional Results available

An Open Label Extension Study of the Safety and Clinical Utility of IPX066 in Subjects With Parkinson's Disease

NCT01096186
View directory record Official record
Conditions
Parkinson's Disease
Interventions
IPX066 95 mg, IPX066 145 mg, IPX066 195 mg, IPX066 245 mg
Drug
Lead sponsor
Impax Laboratories, LLC
Industry
Eligibility
30 Years and older
Enrollment
617 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
36
States / cities
Birmingham, Alabama • Phoenix, Arizona • Little Rock, Arkansas + 30 more
Source: ClinicalTrials.gov public record
Updated Nov 8, 2019 · Synced Oct 4, 2026, 5:42 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 Oct 4, 2026, 5:42 PM 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 4, 2026, 5:42 PM EDT
Completed Phase 2 Interventional Results available

A Study to Compare Pharmacokinetics and Pharmacodynamics of IPX066 to Standard Carbidopa-Levodopa

NCT00869791
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
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
1
States / cities
Hayward, California
Source: ClinicalTrials.gov public record
Updated Nov 8, 2019 · Synced Oct 4, 2026, 5:42 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 Oct 4, 2026, 5:42 PM 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 4, 2026, 5:42 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Compare Two Dose Strengths of CVT-301 (Levodopa Inhalation Powder) With an Oral Dose of Sinemet® (Carbidopa-levodopa) Tablets

NCT02812394
View directory record Official record
Conditions
Parkinson Disease
Interventions
CVT-301 (Dose Level 1), CVT-301 (Dose Level 2), Sinemet®
Drug
Lead sponsor
Acorda Therapeutics
Industry
Eligibility
25 Years to 65 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Oct 26, 2016 · Synced Oct 4, 2026, 5:42 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 Oct 4, 2026, 5:42 PM 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 4, 2026, 5:42 PM 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 4, 2026, 5:42 PM EDT
Completed Phase 2 Interventional Results available

High and Low Dose Carbidopa Treatment of Parkinson's Disease

NCT01399905
View directory record Official record
Conditions
Parkinson's Disease
Interventions
carbidopa
Drug
Lead sponsor
Oregon Health and Science University
Other
Eligibility
35 Years to 85 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jan 9, 2020 · Synced Oct 4, 2026, 5:42 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 4, 2026, 5:42 PM EDT
Completed Phase 1 Interventional

A Study in Subjects With Parkinson's Disease to Evaluate the Safety and Tolerability of Titration and Continuous Subcutaneous Infusion of ABBV-951 in an Outpatient Environment

NCT03374917
View directory record Official record
Conditions
Parkinson's Disease (PD)
Interventions
ABBV-951
Drug
Lead sponsor
AbbVie
Industry
Eligibility
30 Years to 85 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2019
U.S. locations
12
States / cities
Sun City, Arizona • Loma Linda, California • Orange, California + 9 more
Source: ClinicalTrials.gov public record
Updated Nov 12, 2024 · Synced Oct 4, 2026, 5:42 PM EDT
Completed No phase listed Observational Results available

Clinical Outcome Assessment of Parkinson's Disease Patients Treated With XADAGO (Safinamide)

NCT03944785
View directory record Official record
Conditions
Idiopathic Parkinson Disease
Interventions
XADAGO (safinamide)
Drug
Lead sponsor
Supernus Pharmaceuticals, Inc.
Industry
Eligibility
30 Years to 80 Years
Enrollment
164 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
30
States / cities
Homewood, Alabama • Bakersfield, California • Laguna Hills, California + 27 more
Source: ClinicalTrials.gov public record
Updated Jun 7, 2023 · Synced Oct 4, 2026, 5:42 PM EDT
Completed Phase 3 Interventional

A Single Center, Randomized, Double-blind, Crossover Pilot Trial Comparing the Onset of Action of Parcopa™ With Sinemet® in Subjects With Stable Parkinson's Disease

NCT00139880
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Parcopa
Drug
Lead sponsor
UCB Pharma
Industry
Eligibility
40 Years and older
Timeline
2005
U.S. locations
1
States / cities
Milwaukee, Wisconsin
Source: ClinicalTrials.gov public record
Updated Sep 4, 2013 · Synced Oct 4, 2026, 5:42 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 4, 2026, 5:42 PM 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 4, 2026, 5:42 PM EDT
Completed Phase 2 Interventional

12-Week, Double-Blind, Placebo-Controlled Study of 20 and 60 mg/Day Istradefylline in Parkinson's Disease Patients on Levodopa/Carbodopa

NCT00456794
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
325 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 4, 2026, 5:42 PM EDT
Withdrawn Phase 4 Interventional

Combining Robotic-Assisted Therapy and Pharmacotherapy in Post-Stroke Rehabilitation

NCT02346630
View directory record Official record
Conditions
Stroke
Interventions
Placebo, Levodopa / Carbidopa, Armeo
Drug · Device
Lead sponsor
Ross D. Zafonte, MD
Other
Eligibility
18 Years to 85 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Charlestown, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 27, 2021 · Synced Oct 4, 2026, 5:42 PM EDT