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Showing 1–24 of 253 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Levodopa Clear all
Completed Not applicable Interventional

Deep Brain Stimulation to Treat Symptoms of Parkinson's Disease

NCT00552474
View directory record Official record
Conditions
Parkinson Disease, Movement Disorders
Interventions
Libra Deep Brain Stimulation System
Device
Lead sponsor
Abbott Medical Devices
Industry
Eligibility
18 Years to 80 Years
Enrollment
136 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2016
U.S. locations
15
States / cities
Loma Linda, California • Gainesville, Florida • Miami, Florida + 11 more
Source: ClinicalTrials.gov public record
Updated Feb 3, 2019 · Synced Sep 1, 2026, 5:37 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 11, 2024 · Synced Sep 1, 2026, 5:37 PM 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 13, 2022 · Synced Sep 1, 2026, 5:37 PM EDT
Completed Phase 3 Interventional

A Study of Istradefylline (KW-6002) for the Treatment of Parkinson's Disease in Patients Taking Levodopa

NCT00199407
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
230 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2006
U.S. locations
1
States / cities
Princeton, New Jersey
Source: ClinicalTrials.gov public record
Updated Apr 24, 2024 · Synced Sep 1, 2026, 5:37 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 1, 2026, 5:37 PM EDT
Terminated Phase 3 Interventional Results available

Effect of Rotigotine on Motor Symptoms in Patients With Advanced Parkinson's Disease (PD) With Motor Fluctuations and Symptoms of Gastrointestinal Dysfunction

NCT01536015
View directory record Official record
Conditions
Advanced Parkinson's Disease
Interventions
Rotigotine, Placebo
Drug
Lead sponsor
UCB Pharma
Industry
Eligibility
30 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
26
States / cities
Birmingham, Alabama • Gilbert, Arizona • Fountain Valley, California + 23 more
Source: ClinicalTrials.gov public record
Updated Jul 31, 2014 · Synced Sep 1, 2026, 5:37 PM EDT
Completed Phase 3 Interventional Results available

Efficacy, Safety and Tolerability Study of APL-130277 for the Acute Treatment of OFF Episodes in Patients With Parkinson's Disease

NCT02469090
View directory record Official record
Conditions
Parkinson Disease, Off Episodes
Interventions
APL-130277, Placebo
Drug
Lead sponsor
Sumitomo Pharma America, Inc.
Industry
Eligibility
18 Years and older
Enrollment
141 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
32
States / cities
Birmingham, Alabama • Phoenix, Arizona • Scottsdale, Arizona + 27 more
Source: ClinicalTrials.gov public record
Updated Jul 29, 2020 · Synced Sep 1, 2026, 5:37 PM EDT
Completed Not applicable Interventional Results available

Computational Modeling of 60 Hz Subthalamic Nucleus Deep Brain Stimulation for Gait Disorder in Parkinson's Disease

NCT04184791
View directory record Official record
Conditions
Parkinson Disease
Interventions
Deep Brain Stimulation
Device
Lead sponsor
Northwell Health
Other
Eligibility
21 Years to 80 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Great Neck, New York
Source: ClinicalTrials.gov public record
Updated Mar 14, 2024 · Synced Sep 1, 2026, 5:37 PM 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 13, 2023 · Synced Sep 1, 2026, 5:37 PM EDT
Completed Phase 2 Interventional

Evaluation of the Efficacy and Safety of Modified Release AFQ056 in Parkinson's Patients With L-dopa Induced Dyskinesias

NCT01491529
View directory record Official record
Conditions
Dyskinesias, Parkinson Disease, Movement Disorders, Parkinsonian Disorders, Anti-Dyskinesia Agents
Interventions
AFQ056, Placebo
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
30 Years to 80 Years
Enrollment
154 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
5
States / cities
Sunnyvale, California • Englewood, Colorado • Tampa, Florida + 2 more
Source: ClinicalTrials.gov public record
Updated Dec 22, 2020 · Synced Sep 1, 2026, 5:37 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

PET Imaging of the Dopaminergic and Serotonergic Systems in Treated HIV Positive Subjects

NCT03581305
View directory record Official record
Conditions
Depression, HIV Infections, HIV-Associated Cognitive Motor Complex
Interventions
18F-FDOPA, 11C-DASB
Drug
Lead sponsor
National Institutes of Health Clinical Center (CC)
NIH
Eligibility
18 Years to 70 Years
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2022
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 20, 2023 · Synced Sep 1, 2026, 5:37 PM EDT
Not listed Phase 1 Interventional

Phase I Open-label Study of Low-dose Ketamine Infusion Treatment in Levodopa-Induced Dyskinesia in Parkinson's Disease

NCT06021756
View directory record Official record
Conditions
Levodopa-Induced Dyskinesia, Parkinson's Disease
Interventions
Intervention: Ketamine
Drug
Lead sponsor
University of Arizona
Other
Eligibility
30 Years to 85 Years
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Aug 31, 2023 · Synced Sep 1, 2026, 5:37 PM EDT
Completed Phase 2Phase 3 Interventional

Safety and Efficacy Study of SYN115 in Parkinson's Patients Using Levodopa to Treat End of Dose Wearing Off

NCT01283594
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Tozadenant (SYN115) 60 mg BID, Placebo, Levodopa (L-dopa), Tozadenant (SYN115) 120 mg BID, Tozadenant (SYN115) 180 mg BID, Tozadenant (SYN115) 240 mg BID
Drug
Lead sponsor
Biotie Therapies Inc.
Industry
Eligibility
30 Years to 80 Years
Enrollment
420 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
40
States / cities
Birmingham, Alabama • La Jolla, California • Loma Linda, California + 37 more
Source: ClinicalTrials.gov public record
Updated Jan 16, 2019 · Synced Sep 1, 2026, 5:37 PM EDT
Recruiting Not applicable Interventional

Real-Time Levodopa Level Monitoring in Parkinson Disease

NCT04735627
View directory record Official record
Conditions
Parkinson Disease
Interventions
Levodopameter
Device
Lead sponsor
University of California, San Diego
Other
Eligibility
40 Years to 85 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2028
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Feb 10, 2025 · Synced Sep 1, 2026, 5:37 PM EDT
Completed Phase 2 Interventional Results available

A Clinical Study of Mesdopetam in Patients With Parkinson's Disease Experiencing Levodopa Induced Dyskinesia

NCT04435431
View directory record Official record
Conditions
Parkinson Disease
Interventions
Mesdopetam, Placebo
Drug
Lead sponsor
Integrative Research Laboratories AB
Industry
Eligibility
30 Years to 79 Years
Enrollment
155 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
14
States / cities
Scottsdale, Arizona • Long Beach, California • Palo Alto, California + 9 more
Source: ClinicalTrials.gov public record
Updated Mar 5, 2024 · Synced Sep 1, 2026, 5:37 PM EDT
Completed Phase 2 Interventional

Effects of Monoamine Reuptake Inhibitor NS2330 in Parkinson's Disease

NCT00006077
View directory record Official record
Conditions
Parkinson's Disease
Interventions
NS2330, Levodopa and Domperidone
Drug
Lead sponsor
National Institute of Neurological Disorders and Stroke (NINDS)
NIH
Eligibility
Not listed
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2003
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 1, 2026, 5:37 PM EDT
Terminated Phase 3 Interventional Results available

Efficacy and Safety of Amantadine Hydrochloride (HCl) ER Tablets to Treat Parkinson's Disease Patients With LID.

NCT02153645
View directory record Official record
Conditions
Parkinson's Disease, Levodopa Induced Dyskinesias (LID)
Interventions
240mg Amantadine HCl ER tablets, Placebo tablets, 320mg Amantadine HCl ER tablets
Drug
Lead sponsor
Adamas Pharmaceuticals, Inc.
Industry
Eligibility
30 Years to 85 Years
Enrollment
87 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
26
States / cities
Tucson, Arizona • Fountain Valley, California • Irvine, California + 21 more
Source: ClinicalTrials.gov public record
Updated Feb 15, 2022 · Synced Sep 1, 2026, 5:37 PM EDT
Completed Phase 2 Interventional

Lenrispodun as Adjunctive Therapy in the Treatment of Patients With Motor Fluctuations Due to Parkinson's Disease

NCT05766813
View directory record Official record
Conditions
Parkinson Disease
Interventions
Lenrispodun, Placebo
Drug
Lead sponsor
Intra-Cellular Therapies, Inc.
Industry
Eligibility
40 Years and older
Enrollment
79 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
35
States / cities
Phoenix, Arizona • Scottsdale, Arizona • Irvine, California + 31 more
Source: ClinicalTrials.gov public record
Updated Jul 23, 2026 · Synced Sep 1, 2026, 5:37 PM 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 21, 2018 · Synced Sep 1, 2026, 5:37 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 1, 2026, 5:37 PM EDT
Completed Phase 1 Interventional

Safety Study of AADC Gene Therapy (VY-AADC01) for Parkinson's Disease

NCT01973543
View directory record Official record
Conditions
Parkinson's Disease
Interventions
VY-AADC01
Biological
Lead sponsor
Neurocrine Biosciences
Industry
Eligibility
40 Years to 70 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2020
U.S. locations
2
States / cities
San Francisco, California • Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 2, 2020 · Synced Sep 1, 2026, 5:37 PM 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 15, 2024 · Synced Sep 1, 2026, 5:37 PM EDT
Completed Phase 1 Interventional Results available

Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of PF-06649751 in Parkinson's Disease

NCT02224664
View directory record Official record
Conditions
Parkinson's Disease
Interventions
PF-06649751
Drug
Lead sponsor
Pfizer
Industry
Eligibility
30 Years to 80 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
16
States / cities
Fountain Valley, California • Long Beach, California • Englewood, Colorado + 10 more
Source: ClinicalTrials.gov public record
Updated Mar 26, 2017 · Synced Sep 1, 2026, 5:37 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 1, 2026, 5:37 PM EDT