Independent directory Public ClinicalTrials.gov records United States
Clinical Trials Finder
Objective public record navigation
Search Results

Search by objective public record fields.

Search by query text, NCT ID, condition, intervention, sponsor, city, state, recruitment status, phase, study type, healthy volunteer eligibility, sex, or age. Results come from ClinicalTrials.gov. When the live registry is unavailable, a clearly labeled stored copy may be shown.

Clear filters

These results were retrieved from the live ClinicalTrials.gov registry. Filters and sort order apply to this result list.

ClinicalTrials.gov public records Last synced Oct 23, 2026, 10:37 AM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 1–14 of 14 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Carbidopa High-Dose Clear all
Completed Phase 2 Interventional Results available

Pilot Study to Evaluate Levodopa as Treatment for Residual Amblyopia

NCT00789672
View directory record Official record
Conditions
Amblyopia
Interventions
levodopa/carbidopa, patching
Drug · Device
Lead sponsor
Jaeb Center for Health Research
Other
Eligibility
8 Years to 17 Years
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 13, 2016 · Synced Oct 23, 2026, 10:37 AM EDT
Completed Phase 2 Interventional Results available

Carbidopa for the Treatment of Excessive Blood Pressure Variability

NCT02553265
View directory record Official record
Conditions
Dysautonomia, Familial, Baroreflex Failure Syndrome
Interventions
Carbidopa Low-Dose, Placebo, Carbidopa High-Dose
Drug · Other
Lead sponsor
NYU Langone Health
Other
Eligibility
10 Years to 60 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
2
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 9, 2022 · Synced Oct 23, 2026, 10:37 AM 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 23, 2026, 10:37 AM 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 23, 2026, 10:37 AM 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 11, 2025 · Synced Oct 23, 2026, 10:37 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 23, 2026, 10:37 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 23, 2026, 10:37 AM EDT
Completed Phase 3 Interventional Results available

A Study to Evaluate the Safety and Tolerability of ABBV-951 in Subjects With Parkinson's Disease (PD)

NCT03781167
View directory record Official record
Conditions
Parkinson's Disease (PD)
Interventions
ABBV-951
Drug
Lead sponsor
AbbVie
Industry
Eligibility
30 Years and older
Enrollment
244 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
24
States / cities
Birmingham, Alabama • Sun City, Arizona • Fountain Valley, California + 21 more
Source: ClinicalTrials.gov public record
Updated Oct 23, 2023 · Synced Oct 23, 2026, 10:37 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 23, 2026, 10:37 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 23, 2026, 10:37 AM 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 23, 2026, 10:37 AM 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 23, 2026, 10:37 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

The Effect of Dopamine on Diabetic Retinopathy

NCT02706977
View directory record Official record
Conditions
Diabetes
Interventions
Low Dose Sinemet CR, High Dose Sinemet CR, RETeval Electroretinogram (ERG) Testing, Contrast Sensitivity Testing, Visual Acuity Testing
Drug · Device · Other
Lead sponsor
Emory University
Other
Eligibility
18 Years to 80 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2019
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Oct 9, 2019 · Synced Oct 23, 2026, 10:37 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 23, 2026, 10:37 AM EDT