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Showing 1–24 of 39 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Carbidopa capsule Clear all
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 15, 2015 · Synced Sep 7, 2026, 2:23 PM 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 17, 2022 · Synced Sep 7, 2026, 2:23 PM 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 14, 2020 · Synced Sep 7, 2026, 2:23 PM 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 5, 2019 · Synced Sep 7, 2026, 2:23 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 25, 2016 · Synced Sep 7, 2026, 2:23 PM 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 12, 2016 · Synced Sep 7, 2026, 2:23 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 26, 2021 · Synced Sep 7, 2026, 2:23 PM 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 20, 2016 · Synced Sep 7, 2026, 2:23 PM EDT
Completed Phase 3 Interventional Results available

A Study To Evaluate The Safety And Efficacy Of IPX066 In Advanced Parkinson's Disease (ADVANCE-PD).

NCT00974974
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
471 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
35
States / cities
Birmingham, Alabama • Phoenix, Arizona • Little Rock, Arkansas + 30 more
Source: ClinicalTrials.gov public record
Updated Aug 10, 2020 · Synced Sep 7, 2026, 2:23 PM 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 28, 2023 · Synced Sep 7, 2026, 2:23 PM 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 13, 2018 · Synced Sep 7, 2026, 2:23 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 7, 2019 · Synced Sep 7, 2026, 2:23 PM EDT
Not listed Phase 2 Interventional

Effect of L-Dihydoxyphenylserine on Locomotion, Postural Stability, and Fall Risk Reduction in Parkinson Disease

NCT02812147
View directory record Official record
Conditions
Parkinson Disease
Interventions
L-DOPS, Placebo
Drug
Lead sponsor
St. Joseph's Hospital and Medical Center, Phoenix
Other
Eligibility
30 Years to 83 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Feb 14, 2019 · Synced Sep 7, 2026, 2:23 PM 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 5, 2026 · Synced Sep 7, 2026, 2:23 PM 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 2, 2012 · Synced Sep 7, 2026, 2:23 PM 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 7, 2025 · Synced Sep 7, 2026, 2:23 PM 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 22, 2012 · Synced Sep 7, 2026, 2:23 PM EDT
Completed Phase 1 Interventional

A Study of the Safety and Levodopa Pharmacokinetics Following Single Dose Administration of CVT 301 (Levodopa Inhalation Powder) in Smoking and Non-Smoking Adults

NCT02633839
View directory record Official record
Conditions
Smoking
Interventions
CVT-301, Carbidopa
Drug
Lead sponsor
Acorda Therapeutics
Industry
Eligibility
25 Years to 65 Years
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
2
States / cities
Daytona Beach, Florida • Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Jul 13, 2016 · Synced Sep 7, 2026, 2:23 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A TQT Study to Evaluate the Electrocardiographic Effects of Carbidopa in Healthy Subjects

NCT06161220
View directory record Official record
Conditions
Cardiac Repolarization in Healthy Subjects
Interventions
Carbidopa capsule, Moxifloxacin Tablets, USP, Placebo
Drug
Lead sponsor
Impax Laboratories, LLC
Industry
Eligibility
18 Years to 55 Years
Enrollment
35 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Dilworth, Minnesota
Source: ClinicalTrials.gov public record
Updated Mar 4, 2024 · Synced Sep 7, 2026, 2:23 PM 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 30, 2019 · Synced Sep 7, 2026, 2:23 PM 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 8, 2017 · Synced Sep 7, 2026, 2:23 PM 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 20, 2025 · Synced Sep 7, 2026, 2:23 PM EDT
Withdrawn Phase 2 Interventional Accepts healthy volunteers

Histaminergic Basis of Fatigue in Multiple Sclerosis

NCT04764383
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
L-Histidine, Placebo, Lodosyn
Drug
Lead sponsor
University of Miami
Other
Eligibility
18 Years to 60 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jul 28, 2021 · Synced Sep 7, 2026, 2:23 PM 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 29, 2023 · Synced Sep 7, 2026, 2:23 PM EDT