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ClinicalTrials.gov public records Last synced Oct 17, 2026, 9:34 AM EDT

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Showing 97–120 of 136 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Carbidopa Clear all
Completed Phase 1Phase 2 Interventional

An Exploratory Study of XP21279 (With Lodosyn®) and Sinemet® in Parkinson's Disease Subjects

NCT00914602
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Sinemet 25-100 Oral Tablet, XP21279, Carbidopa Pill
Drug
Lead sponsor
XenoPort, Inc.
Industry
Eligibility
30 Years to 75 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
2
States / cities
Peoria, Arizona • Bingham Farms, Michigan
Source: ClinicalTrials.gov public record
Updated May 5, 2021 · Synced Oct 17, 2026, 9:34 AM EDT
Completed Phase 1 Interventional

Treatment of Supine Hypertension in Autonomic Failure

NCT00223717
View directory record Official record
Conditions
Hypertension
Interventions
Clonidine, Nitroglycerin transdermal, Dipyridamole/ Aspirin (Aggrenox), Desmopressin (DDAVP), Sildenafil, Nifedipine, Hydralazine, Hydrochlorothiazide, Placebo, Bosentan, Diltiazem, Eplerenone, guanfacine, L-arginine, captopril, carbidopa, losartan, metoprolol tartrate, nebivolol hydrochloride, prazosin hydrochloride, tamsulosin hydrochloride, Head-up tilt., aliskiren, Local heat stress
Drug · Dietary Supplement · Other
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 80 Years
Enrollment
152 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2017
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 13, 2017 · Synced Oct 17, 2026, 9:34 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 17, 2026, 9:34 AM EDT
Completed No phase listed Observational

Observational Study Evaluating Long-Term Effectiveness of Duodopa/Duopa in Patients With Advanced Parkinson's Disease

NCT02611713
View directory record Official record
Conditions
Advanced Parkinson's Disease
Interventions
Not listed
Lead sponsor
AbbVie
Industry
Eligibility
18 Years to 99 Years
Enrollment
213 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
19
States / cities
Birmingham, Alabama • Boca Raton, Florida • Gainesville, Florida + 16 more
Source: ClinicalTrials.gov public record
Updated Dec 15, 2021 · Synced Oct 17, 2026, 9:34 AM EDT
Completed Phase 1 Interventional

Sinemet for Spasticity and Function in Amyotrophic Lateral Sclerosis and Primary Lateral Sclerosis

NCT03929068
View directory record Official record
Conditions
Amyotrophic Lateral Sclerosis, Motor Neuron Disease
Interventions
carbidopa-levodopa, Placebo Oral Tablet
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 11, 2022 · Synced Oct 17, 2026, 9:34 AM EDT
Completed Phase 1Phase 2 Interventional

NE3107 Activity and Safety in Patients With Parkinson's Disease Using Levodopa

NCT05083260
View directory record Official record
Conditions
Parkinson Disease
Interventions
NE3107, placebo
Drug
Lead sponsor
BioVie Inc.
Industry
Eligibility
30 Years to 80 Years
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
16
States / cities
Englewood, Colorado • Boca Raton, Florida • Hallandale, Florida + 10 more
Source: ClinicalTrials.gov public record
Updated Feb 8, 2023 · Synced Oct 17, 2026, 9:34 AM EDT
Completed Phase 1 Interventional

Measuring Parkinson's Disease Progression

NCT03205956
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Levodopa
Drug
Lead sponsor
Kevin J. Black, MD
Other
Eligibility
40 Years to 79 Years
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Oct 14, 2022 · Synced Oct 17, 2026, 9:34 AM EDT
Completed Phase 3 Interventional Results available

Open Label Continuation Treatment Study With Levodopa-Carbidopa Intestinal Gel in Advanced Parkinson's Disease

NCT00660673
View directory record Official record
Conditions
Advanced Parkinson's Disease
Interventions
Levodopa-Carbidopa Intestinal Gel (LCIG), CADD-Legacy® 1400 ambulatory infusion pump, Percutaneous Endoscopic Gastrostomy with jejunal extension tube (PEG-J)
Drug · Device
Lead sponsor
AbbVie
Industry
Eligibility
30 Years to 99 Years
Enrollment
262 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2021
U.S. locations
31
States / cities
Birmingham, Alabama • Encinitas, California • Fountain Valley, California + 25 more
Source: ClinicalTrials.gov public record
Updated Dec 2, 2022 · Synced Oct 17, 2026, 9:34 AM EDT
Completed Phase 2 Interventional Results available

Study of Droxidopa Treatment in Adults With Attention Deficit Hyperactivity Disorder With Co-administration of Carbidopa

NCT00983814
View directory record Official record
Conditions
Attention Deficit Hyperactivity Disorder
Interventions
Droxidopa+Carbidopa
Drug
Lead sponsor
Chelsea Therapeutics
Industry
Eligibility
18 Years to 55 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 18, 2024 · Synced Oct 17, 2026, 9:34 AM EDT
Completed Phase 3 Interventional Results available

A Study Comparing Efficacy of Levodopa-Carbidopa Intestinal Gel/Carbidopa-Levodopa Enteral Suspension and Optimized Medical Treatment on Dyskinesia in Subjects With Advanced Parkinson's Disease (DYSCOVER)

NCT02799381
View directory record Official record
Conditions
Parkinson's Disease (PD)
Interventions
Optimized antiparkinsonian treatment, Levodopa-Carbidopa Intestinal Gel (LCIG), CADD-Legacy ambulatory infusion pump, Percutaneous endoscopic gastrostomy tube, Jejunal extension tube
Drug · Device
Lead sponsor
AbbVie
Industry
Eligibility
30 Years and older
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
2
States / cities
Port Charlotte, Florida • Round Rock, Texas
Source: ClinicalTrials.gov public record
Updated Aug 18, 2020 · Synced Oct 17, 2026, 9:34 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Histaminergic Basis of Central Fatigue in Multiple Sclerosis - A Novel Approach

NCT03266965
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Carbidopa, L-Histidine
Drug · Dietary Supplement
Lead sponsor
University of Miami
Other
Eligibility
18 Years to 60 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Oct 8, 2020 · Synced Oct 17, 2026, 9:34 AM EDT
Not listed Phase 2 Interventional Accepts healthy volunteers

Proof of Mechanism Study for the Treatment of Social Anhedonia in ASD

NCT03243552
View directory record Official record
Conditions
ASD
Interventions
L-DOPA versus Placebo, Social Skills Training
Drug · Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
13 Years to 30 Years
Enrollment
56 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2023
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 28, 2023 · Synced Oct 17, 2026, 9:34 AM EDT
Active, not recruiting Phase 2Phase 3 Interventional

Effects of 5HTP on the Injured Human Spinal Cord

NCT04520178
View directory record Official record
Conditions
Spinal Cord Injuries
Interventions
5-Hydroxytryptophan 100 MG, 5-Hydroxytryptophan, Carbidopa, Placebo
Drug
Lead sponsor
University of Alberta
Other
Eligibility
18 Years to 65 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
1
States / cities
Louisville, Kentucky
Source: ClinicalTrials.gov public record
Updated Sep 16, 2026 · Synced Oct 17, 2026, 9:34 AM 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 17, 2026, 9:34 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 17, 2026, 9:34 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 17, 2026, 9:34 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 17, 2026, 9:34 AM EDT
Completed Phase 2 Interventional Results available

Carbidopa-levodopa in Neovascular AMD

NCT03022318
View directory record Official record
Conditions
Age-related Macular Degeneration
Interventions
carbidopa-levodopa 25-100 mg tablets
Drug
Lead sponsor
Snyder, Robert W., M.D., Ph.D., P.C.
Individual
Eligibility
50 Years to 85 Years
Enrollment
20 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, 9:34 AM EDT
Completed Phase 3 Interventional

Study to Evaluate the Safety and Tolerability of Rasagiline in Advanced Parkinson's Disease Patients

NCT00203164
View directory record Official record
Conditions
Parkinson's Disease
Interventions
rasagiline mesylate
Drug
Lead sponsor
Teva Branded Pharmaceutical Products R&D, Inc.
Industry
Eligibility
30 Years and older
Enrollment
254 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2006
U.S. locations
6
States / cities
Fresno, California • Chicago, Illinois • Omaha, Nebraska + 3 more
Source: ClinicalTrials.gov public record
Updated Mar 9, 2010 · Synced Oct 17, 2026, 9:34 AM EDT
Completed Phase 2Phase 3 Interventional Results available

Augmenting Language Therapy for Aphasia: Levodopa

NCT01429077
View directory record Official record
Conditions
Nonfluent Aphasia, Stroke
Interventions
levodopa/carbidopa, Placebo comparator
Drug
Lead sponsor
Shirley Ryan AbilityLab
Other
Eligibility
21 Years and older
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2012
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 25, 2013 · Synced Oct 17, 2026, 9:34 AM EDT
Completed Phase 2 Interventional Results available

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

NCT03007888
View directory record Official record
Conditions
Advanced Parkinson's Disease
Interventions
Sinemet, IPX203
Drug
Lead sponsor
Impax Laboratories, LLC
Industry
Eligibility
40 Years to 100 Years
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2017
U.S. locations
11
States / cities
Little Rock, Arkansas • Boca Raton, Florida • Naples, Florida + 7 more
Source: ClinicalTrials.gov public record
Updated Jun 6, 2022 · Synced Oct 17, 2026, 9:34 AM EDT
Active, not recruiting Phase 2 Interventional Results available

A Long Term Safety Study of ND0612 Administered as a Continuous SC Infusion in Advanced Parkinson's Disease

NCT02726386
View directory record Official record
Conditions
Parkinson's Disease
Interventions
ND0612
Drug
Lead sponsor
NeuroDerm Ltd.
Industry
Eligibility
30 Years and older
Enrollment
214 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2027
U.S. locations
26
States / cities
Phoenix, Arizona • Little Rock, Arkansas • Fountain Valley, California + 23 more
Source: ClinicalTrials.gov public record
Updated May 30, 2025 · Synced Oct 17, 2026, 9:34 AM 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 17, 2026, 9:34 AM 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 17, 2026, 9:34 AM EDT