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ClinicalTrials.gov public records Last synced Oct 17, 2026, 4:32 AM EDT

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Showing 1–24 of 35 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: carbidopa-levodopa 25-100 mg Clear all
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 Oct 17, 2026, 4:32 AM 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 17, 2026, 4:32 AM 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 17, 2026, 4:32 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Withdrawn Phase 2 Interventional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, 4:32 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, 4:32 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, 4:32 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, 4:32 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, 4:32 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, 4:32 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, 4:32 AM 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 17, 2026, 4:32 AM EDT
Terminated Phase 4 Interventional Results available

Carbidopa/Levodopa/Entacapone Versus Immediate Release (IR) Carbidopa/Levodopa on Non-motor Symptoms in Patients With Idiopathic Parkinson's Disease and Demonstrating Non-motor Symptoms of Wearing Off

NCT00642356
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Carbidopa/levodopa/entacapone, Immediate release carbidopa/levodopa
Drug
Lead sponsor
Novartis
Industry
Eligibility
30 Years to 85 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
21
States / cities
Phoenix, Arizona • Aliso Viejo, California • Irvine, California + 17 more
Source: ClinicalTrials.gov public record
Updated Feb 18, 2011 · Synced Oct 17, 2026, 4:32 AM 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 17, 2026, 4:32 AM EDT
Completed Phase 1 Interventional

Pharmacokinetic Study of CVT-301 (Levodopa Inhalation Powder)

NCT03887884
View directory record Official record
Conditions
Parkinson's Disease
Interventions
CVT-301, Sinemet
Drug
Lead sponsor
Acorda Therapeutics
Industry
Eligibility
30 Years to 85 Years
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
5
States / cities
Long Beach, California • Hallandale, Florida • Orlando, Florida + 2 more
Source: ClinicalTrials.gov public record
Updated Aug 2, 2019 · Synced Oct 17, 2026, 4:32 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 17, 2026, 4:32 AM EDT
Completed Phase 3 Interventional

A Study to Evaluate Fixed Dose Carbidopa/Levodopa/Entacapone Versus Immediate Release Carbidopa/Levodopa

NCT00134966
View directory record Official record
Conditions
Parkinson's Disease
Interventions
capsules containing: carbidopa (25 mg), levodopa (100 mg), entacapone (200 mg)
Drug
Lead sponsor
Novartis
Industry
Eligibility
30 Years to 80 Years
Enrollment
493 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
17
States / cities
Phoenix, Arizona • La Jolla, California • Reseda, California + 13 more
Source: ClinicalTrials.gov public record
Updated May 17, 2017 · Synced Oct 17, 2026, 4:32 AM 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 Oct 17, 2026, 4:32 AM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers

Carbidopa-Levodopa in Dry AMD With Geographic Atrophy

NCT03451500
View directory record Official record
Conditions
Age Related Macular Degeneration
Interventions
carbidopa-levodopa
Drug
Lead sponsor
Snyder, Robert W., M.D., Ph.D., P.C.
Individual
Eligibility
50 Years to 85 Years
Enrollment
7 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Apr 25, 2024 · Synced Oct 17, 2026, 4:32 AM 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 Oct 17, 2026, 4:32 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 17, 2026, 4:32 AM 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 Oct 17, 2026, 4:32 AM EDT
Enrolling by invitation Early Phase 1 Interventional

Treating Early Stage Diabetic Retinopathy

NCT05132660
View directory record Official record
Conditions
Diabetic Retinopathy
Interventions
Sinemet CR, placebo
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
30 Years to 80 Years
Enrollment
244 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2028
U.S. locations
1
States / cities
Decatur, Georgia
Source: ClinicalTrials.gov public record
Updated Apr 7, 2026 · Synced Oct 17, 2026, 4:32 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 17, 2026, 4:32 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 17, 2026, 4:32 AM EDT