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ClinicalTrials.gov public records Last synced Oct 20, 2026, 3:56 PM EDT

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Showing 1–24 of 345 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: phenylacetate Clear all
Terminated Phase 1 Interventional Results available

Methylphenidate for Cancer-Related Fatigue

NCT01164956
View directory record Official record
Conditions
Cancer
Interventions
methylphenidate, Placebo
Drug · Other
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
7 Years to 21 Years
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 26, 2019 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers

A PET Study Examining Pharmacokinetics and Dopamine Transporter Receptor Occupancy Of Two Long-Acting Formulations of Methylphenidate in Adults

NCT00301639
View directory record Official record
Conditions
Healthy Volunteers
Interventions
OROS methylphenidate hydrochloride, methylphenidate hydrochloride
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 55 Years
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005
U.S. locations
1
States / cities
Cambridge, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 12, 2011 · Synced Oct 20, 2026, 3:56 PM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

Contribution of UGT2B17 to the Pharmacokinetics of Diclofenac

NCT06053411
View directory record Official record
Conditions
Interaction
Interventions
Diclofenac, curcumin
Drug · Dietary Supplement
Lead sponsor
Washington State University
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2027
U.S. locations
1
States / cities
Spokane, Washington
Source: ClinicalTrials.gov public record
Updated Oct 20, 2026 · Synced Oct 20, 2026, 3:56 PM EDT
Terminated Phase 3 Interventional

Methylphenidate to Improve Quality of Life in Patients Undergoing Radiation Therapy for Brain Tumors

NCT00031798
View directory record Official record
Conditions
Brain and Central Nervous System Tumors, Cognitive/Functional Effects, Depression, Fatigue, Quality of Life
Interventions
methylphenidate hydrochloride, quality-of-life assessment, radiation therapy
Drug · Procedure · Radiation
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 120 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2006
U.S. locations
7
States / cities
Phoenix, Arizona • Decatur, Illinois • New Orleans, Louisiana + 4 more
Source: ClinicalTrials.gov public record
Updated Sep 9, 2021 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Guanfacine Immediate-release Electrocardiogram Results (QTc) Study

NCT00672984
View directory record Official record
Conditions
Healthy Volunteers
Interventions
immediate release guanfacine hydrochloride, moxifloxacin, Placebo
Drug
Lead sponsor
Shire
Industry
Eligibility
18 Years to 45 Years
Enrollment
83 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Jun 14, 2021 · Synced Oct 20, 2026, 3:56 PM EDT
Recruiting No phase listed Observational

WAKIX® (Pitolisant) Pregnancy Registry

NCT05536011
View directory record Official record
Conditions
Pregnancy Related, Narcolepsy
Interventions
Pitolisant, Comparator Products
Drug
Lead sponsor
Harmony Biosciences Management, Inc.
Industry
Eligibility
Female only
Enrollment
1,329 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2030
U.S. locations
1
States / cities
Morrisville, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 12, 2026 · Synced Oct 20, 2026, 3:56 PM EDT
Completed No phase listed Observational

A Study on Suicidality, Psychosis or Substance Abuse With Methylphenidate, Atomoxetine, Amphetamine/Dextroamphetamine or Lisdexamfetamine

NCT04132557
View directory record Official record
Conditions
Attention Deficit Disorder With Hyperactivity
Interventions
Methylphenidate, Lisdexamfetamine, Atomoxetine, Amphetamine, Dextroamphetamine
Drug
Lead sponsor
Janssen Research & Development, LLC
Industry
Eligibility
Not listed
Enrollment
430,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
1
States / cities
Titusville, New Jersey
Source: ClinicalTrials.gov public record
Updated Jun 25, 2025 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study of the Ability of Functional Magnetic Resonance Imaging (fMRI) to Detect and Characterize the Effects of Two Marketed Centrally Active Drugs, Placebo, and RO4917523 in Healthy Volunteers

NCT01045083
View directory record Official record
Conditions
Healthy Volunteer
Interventions
RO4917523, escitalopram, methylphenidate, placebo
Drug
Lead sponsor
Hoffmann-La Roche
Industry
Eligibility
18 Years to 45 Years
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2011
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Nov 2, 2016 · Synced Oct 20, 2026, 3:56 PM EDT
Terminated Phase 3 Interventional

DORADO-AC-EX - A Long-Term Safety Extension Study to the Phase 3 DORADOC-AC Study (Protocol DAR-312) of Darusentan in Resistant Hypertension

NCT00389675
View directory record Official record
Conditions
Hypertension
Interventions
Darusentan, Guanfacine
Drug
Lead sponsor
Gilead Sciences
Industry
Eligibility
35 Years to 80 Years
Enrollment
661 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
85
States / cities
Birmingham, Alabama • Huntsville, Alabama • Montgomery, Alabama + 69 more
Source: ClinicalTrials.gov public record
Updated Jan 6, 2014 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

PK/PD Comparison of Guanfacine ER and IR

NCT01904526
View directory record Official record
Conditions
Smoking
Interventions
Guanfacine
Drug
Lead sponsor
Yale University
Other
Eligibility
18 Years to 65 Years
Enrollment
5 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2016
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 6, 2020 · Synced Oct 20, 2026, 3:56 PM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

An fMRI Study of Stimulant vs. Non-Stimulant Treatment of ADHD

NCT02259517
View directory record Official record
Conditions
Attention Deficit Hyperactivity Disorder
Interventions
Guanfacine, Lisdexamfetamine
Drug
Lead sponsor
New York State Psychiatric Institute
Other
Eligibility
6 Years to 17 Years
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2021
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 2, 2023 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 2 Interventional Results available

SPD503 in Subjects Aged 6-17 Years With Generalized Anxiety Disorder (GAD), Separation Anxiety Disorder (SAD), or Social Phobia (SoP)

NCT01470469
View directory record Official record
Conditions
Generalized Anxiety Disorder (GAD), Anxiety, Separation, Phobia, Social
Interventions
SPD503 (extended-release Guanfacine hydrochloride), Placebo
Drug
Lead sponsor
Shire
Industry
Eligibility
6 Years to 17 Years
Enrollment
83 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
33
States / cities
Birmingham, Alabama • Carson, California • Imperial, California + 29 more
Source: ClinicalTrials.gov public record
Updated Jun 10, 2021 · Synced Oct 20, 2026, 3:56 PM EDT
Recruiting Phase 4 Interventional

An Open-Label Treatment With Randomization Observation, Investigator-Initiated Study, on the Duration and Efficacy of Jornay PM (Methylphenidate Hydrochloride Extended-Release Capsules) on Adult ADHD Symptoms and Executive Function and Emotional Regulation Throughout the Day Into Early Evening

NCT06577779
View directory record Official record
Conditions
Attention-deficit/Hyperactivity Disorder
Interventions
Methylphenidate Hydrochloride Extended Release Capsule
Drug
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 60 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 29, 2026 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Metabolism of Ornithine Phenylacetate

NCT03159390
View directory record Official record
Conditions
Healthy
Interventions
phenylacetate salt of ornithine
Other
Lead sponsor
Texas A&M University
Other
Eligibility
40 Years to 70 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
College Station, Texas
Source: ClinicalTrials.gov public record
Updated Sep 30, 2025 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 2 Interventional

Methylphenidate in the Treatment of Cocaine Dependent Patients With Adult Attention Deficit Hyperactivity Disorder - 5

NCT00015223
View directory record Official record
Conditions
Cocaine-Related Disorders, Substance-Related Disorders
Interventions
Methylphenidate
Drug
Lead sponsor
National Institute on Drug Abuse (NIDA)
NIH
Eligibility
21 Years to 50 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
1997 – 1999
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Jan 16, 2017 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 3 Interventional Results available

A Pivotal Efficacy Trial to Evaluate HLD200 in Children With ADHD in a Naturalistic Setting

NCT02520388
View directory record Official record
Conditions
Attention Deficit Hyperactivity Disorder
Interventions
HLD200 methylphenidate hydrochloride (MPH) Capsules, Placebo
Drug
Lead sponsor
Ironshore Pharmaceuticals and Development, Inc
Other
Eligibility
6 Years to 12 Years
Enrollment
163 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
21
States / cities
Newport Beach, California • Bradenton, Florida • Gainesville, Florida + 16 more
Source: ClinicalTrials.gov public record
Updated Jul 23, 2021 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 4 Interventional Results available

Study of Atomoxetine and OROS Methylphenidate to Treat Children and Adolescents Ages 6-17 With ADHD

NCT00585910
View directory record Official record
Conditions
ADHD, Attention Deficit Hyperactivity Disorder
Interventions
Atomoxetine and OROS Methylphenidate
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
6 Years to 17 Years
Enrollment
94 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2007
U.S. locations
1
States / cities
Cambridge, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 14, 2012 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Safety Study to Investigate the Skin Sensitization Potential of MFC51123

NCT02192203
View directory record Official record
Conditions
Pain
Interventions
Diclofenac + Menthol Gel, Diclofenac Only Gel, Menthol Only Gel, Placebo Only Gel
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years and older
Enrollment
227 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014
U.S. locations
1
States / cities
Paramus, New Jersey
Source: ClinicalTrials.gov public record
Updated Jun 28, 2017 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 2 Interventional

Effectiveness of Lobeline in Treating Symptoms of ADHD in Adult Patients

NCT00664703
View directory record Official record
Conditions
Attention Deficit Disorder With Hyperactivity
Interventions
Lobeline sulfate, Methylphenidate HCl, Placebo
Drug
Lead sponsor
Yaupon Therapeutics
Industry
Eligibility
21 Years to 45 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Jun 20, 2013 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 4 Interventional

Basic and Clinical Research on Attention Deficit Hyperactivity Disorder (ADHD)

NCT00663442
View directory record Official record
Conditions
ADHD
Interventions
OROS methylphenidate
Drug
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
6 Years to 17 Years
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1999 – 2004
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 22, 2008 · Synced Oct 20, 2026, 3:56 PM EDT
Recruiting Phase 2 Interventional

The Role of Brain Dopamine in Chronic Pain

NCT05285683
View directory record Official record
Conditions
Chronic Pain
Interventions
Methylphenidate, carbidopa-levodopa, Placebo
Drug
Lead sponsor
University of Rochester
Other
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Rochester, New York
Source: ClinicalTrials.gov public record
Updated May 15, 2026 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 2 Interventional

Phenylacetate in Treating Children With Recurrent or Progressive Brain Tumors

NCT00003241
View directory record Official record
Conditions
Brain and Central Nervous System Tumors
Interventions
phenylacetate
Drug
Lead sponsor
Texas Children's Cancer Center
Other
Eligibility
2 Years to 21 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
1998 – 2004
U.S. locations
6
States / cities
Los Angeles, California • San Francisco, California • Washington D.C., District of Columbia + 3 more
Source: ClinicalTrials.gov public record
Updated Jun 26, 2013 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 2 Interventional Results available

MNK6106 for Liver Disease (Hepatic Cirrhosis) That in the Past Has Affected the Brain (Hepatic Encephalopathy)

NCT03712280
View directory record Official record
Conditions
Hepatic Cirrhosis, Hepatic Encephalopathy (HE)
Interventions
MNK6106, Rifaximin
Drug
Lead sponsor
Mallinckrodt
Industry
Eligibility
18 Years to 80 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2020
U.S. locations
4
States / cities
Coronado, California • Rialto, California • St. Petersburg, Florida + 1 more
Source: ClinicalTrials.gov public record
Updated Jul 20, 2021 · Synced Oct 20, 2026, 3:56 PM EDT
Completed Phase 3 Interventional Results available

Sleep and Tolerability Study: Comparing the Effects of Adderall XR and Focalin XR

NCT00393042
View directory record Official record
Conditions
Attention Deficit Hyperactivity Disorder
Interventions
Dexmethylphenidate, Mixed Amphetamine Salts, ER, placebo
Drug
Lead sponsor
Seattle Children's Hospital
Other
Eligibility
9 Years to 17 Years
Enrollment
77 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
2
States / cities
Chicago, Illinois • Northbrook, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 19, 2017 · Synced Oct 20, 2026, 3:56 PM EDT