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Showing 1–24 of 77 matching trials from the live ClinicalTrials.gov search.
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Completed No phase listed Observational

ACEI or ARB and COVID-19 Severity and Mortality in US Veterans

NCT04467931
View directory record Official record
Conditions
Hypertension, COVID
Interventions
ACEI/ARB, Non-ACEI/ARB, ACEI, ARB
Drug
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
22,213 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Apr 27, 2021 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Phase 4 Interventional Results available

Neurobiological Basis of Response to Guanfacine Extended Release in Children and Adolescents With ADHD

NCT01709695
View directory record Official record
Conditions
ADHD, Attention Deficit Hyperactivity Disorder
Interventions
Guanfacine Hydrochloride XR, Placebo
Drug
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
8 Years to 15 Years
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 13, 2018 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Combining Varenicline and Guanfacine for Smoking Cessation

NCT04198116
View directory record Official record
Conditions
Smoking Cessation
Interventions
Varenicline, Guanfacine ER
Drug
Lead sponsor
Yale University
Other
Eligibility
18 Years and older
Enrollment
167 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2025
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Jun 8, 2026 · Synced Sep 5, 2026, 5:26 PM EDT
Not yet recruiting Early Phase 1 Interventional

Guanfacine and Cromolyn Sodium for POTS: The DBPOTS Trial

NCT07757555
View directory record Official record
Conditions
Postural Orthostatic Tachycardia Syndrome (POTS), Dysautonomia, Orthostatic Intolerance, Autonomic Nervous System Diseases
Interventions
Guanfacine (GFC), Cromolyn Sodium, Placebo
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 100 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 11, 2026 · Synced Sep 5, 2026, 5:26 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 5, 2020 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Phase 1 Interventional

Guanfacine to Reduce Stress-Induced Cocaine/Alcohol Craving and Relapse

NCT00585754
View directory record Official record
Conditions
Cocaine Dependent, Alcohol Dependent
Interventions
Guanfacine, Placebo
Drug
Lead sponsor
Yale University
Other
Eligibility
18 Years to 50 Years
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2016
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Nov 29, 2016 · Synced Sep 5, 2026, 5:26 PM EDT
Recruiting Phase 2 Interventional Accepts healthy volunteers

Mechanistic Evaluation of Guanfacine on Drinking Behavior in Women and Men With Alcohol Use Disorders

NCT03764098
View directory record Official record
Conditions
Alcohol Use
Interventions
Guanfacine ER, Placebo
Drug · Other
Lead sponsor
Yale University
Other
Eligibility
21 Years to 70 Years
Enrollment
160 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2026
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Feb 26, 2026 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Guanfacine Treatment for Prefrontal Cognitive Dysfunction in Elderly Subjects

NCT00935493
View directory record Official record
Conditions
Cognitive Aging
Interventions
Guanfacine, Placebo
Drug
Lead sponsor
Yale University
Other
Eligibility
75 Years and older
Enrollment
154 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Aug 12, 2014 · Synced Sep 5, 2026, 5:26 PM EDT
Not listed Not applicable Interventional

Prospective, Multicenter, RCT of the Tenex Ultrasound System

NCT06137222
View directory record Official record
Conditions
Diabetic Foot Ulcer
Interventions
Tenex TXB MicroTip Ultrasound system plus SOC, Standard of Care for diabetic foot ulcer
Device · Other
Lead sponsor
Tenex Health Inc.
Industry
Eligibility
18 Years and older
Enrollment
148 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
2
States / cities
Mobile, Alabama • St. George, Utah
Source: ClinicalTrials.gov public record
Updated Nov 17, 2023 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Early Phase 1 Interventional

Mindfulness-Based ADHD Treatment for Children: a Feasibility Study

NCT04737512
View directory record Official record
Conditions
Attention Deficit Hyperactivity Disorder
Interventions
Mindfulness-Based ADHD Treatment for Children, Goal-Standard Medication (Treatment as Usual)
Behavioral · Biological
Lead sponsor
Yale University
Other
Eligibility
7 Years to 13 Years
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Nov 24, 2024 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Phase 4 Interventional Results available

Efficacy and Safety Eval of Guanfacine Hydrochloride in Combination With Psychostimulants in Adults (18-65).

NCT02141113
View directory record Official record
Conditions
Adult Attention-Deficit Hyperactivity Disorder
Interventions
Guanfacine Hydrochloride, Placebo
Drug · Other
Lead sponsor
Rochester Center for Behavioral Medicine
Other
Eligibility
18 Years to 65 Years
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2014
U.S. locations
1
States / cities
Rochester Hills, Michigan
Source: ClinicalTrials.gov public record
Updated Aug 11, 2025 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Phase 4 Interventional Results available

Electrophysiological Effects of Guanfacine Extended Release in Attention Deficit Hyperactivity Disorder (ADHD)

NCT01069523
View directory record Official record
Conditions
Attention Deficit Disorder With Hyperactivity
Interventions
Guanfacine Extended Release, Placebo
Drug
Lead sponsor
The University of Texas Health Science Center at San Antonio
Other
Eligibility
6 Years to 12 Years
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
San Antonio, Texas
Source: ClinicalTrials.gov public record
Updated Sep 2, 2012 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Phase 3 Interventional Results available

SPD503 (Guanfacine Hydrochloride) in ADHD Plus Oppositional Symptoms

NCT00367835
View directory record Official record
Conditions
ADHD
Interventions
SPD503 (Guanfacine hydrochloride), Placebo
Drug
Lead sponsor
Shire
Industry
Eligibility
6 Years to 12 Years
Enrollment
217 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
34
States / cities
Phoenix, Arizona • El Centro, California • Rolling Hills Estates, California + 29 more
Source: ClinicalTrials.gov public record
Updated Jun 13, 2021 · Synced Sep 5, 2026, 5:26 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 5, 2014 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Phase 3 Interventional Results available

The Effect of Guanfacine on Delirium in Critically Ill Patients

NCT04578886
View directory record Official record
Conditions
Delirium
Interventions
Guanfacine, Placebo
Drug
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Apr 14, 2025 · Synced Sep 5, 2026, 5:26 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 1, 2023 · Synced Sep 5, 2026, 5:26 PM EDT
Recruiting Phase 1 Interventional

Combined Guanfacine and Mindfulness Meditation as an Adjunct to Buprenorphine Maintenance in Opioid Use Disorder

NCT06642181
View directory record Official record
Conditions
Mindfulness, Guanfacine, Opioid Use Disorder
Interventions
Guanfacine pharmacotherapy, Mindfulness Oriented Recovery Enhancement (MORE)
Drug · Behavioral
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years to 55 Years
Enrollment
224 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Newark, New Jersey
Source: ClinicalTrials.gov public record
Updated Aug 7, 2025 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Phase 2 Interventional Results available

Efficacy of Guanfacine and Lidocaine Combination in Trigeminal Nerve Block for Pain Management in Trigeminal Neuropathy

NCT03865940
View directory record Official record
Conditions
Trigeminal Neuralgia
Interventions
Lidocaine, Guanfacine
Drug
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 80 Years
Enrollment
37 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Mar 29, 2025 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Phase 3 Interventional Results available

Efficacy and Safety of SPD503 in Combination With Psychostimulants

NCT00734578
View directory record Official record
Conditions
ADHD
Interventions
SPD503-AM, SPD503-PM, Placebo
Drug
Lead sponsor
Shire
Industry
Eligibility
6 Years to 17 Years
Enrollment
461 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
61
States / cities
Dothan, Alabama • Scottsdale, Arizona • Little Rock, Arkansas + 53 more
Source: ClinicalTrials.gov public record
Updated Jun 13, 2021 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

A Drug Interaction Study of SPD503 and Vyvanse Administered Alone and In Combination in Normal Healthy Volunteers

NCT00919867
View directory record Official record
Conditions
Healthy
Interventions
SPD503, VYVANSE, SPD503 and VYVANSE
Drug
Lead sponsor
Shire
Industry
Eligibility
18 Years to 45 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009
U.S. locations
1
States / cities
Hackensack, New Jersey
Source: ClinicalTrials.gov public record
Updated Jun 13, 2021 · Synced Sep 5, 2026, 5:26 PM EDT
Completed Phase 4 Interventional Results available

A Study of TAK-503 in Children and Teenagers With Attention Deficit Hyperactivity Disorder (ADHD)

NCT04085172
View directory record Official record
Conditions
Attention Deficit Hyperactivity Disorder
Interventions
Guanfacine hydrochloride (TAK-503), Atomoxetine hydrochloride, Placebo
Drug · Other
Lead sponsor
Shire
Industry
Eligibility
6 Years to 17 Years
Enrollment
396 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2025
U.S. locations
20
States / cities
Dothan, Alabama • Anaheim, California • Imperial, California + 17 more
Source: ClinicalTrials.gov public record
Updated Apr 12, 2026 · Synced Sep 5, 2026, 5:26 PM EDT
Terminated Phase 4 Interventional Accepts healthy volunteers

Pharmacology of Cognition in Schizotypal Personality Disorder

NCT00353379
View directory record Official record
Conditions
Schizotypal Personality Disorder, Personality Disorders
Interventions
Guanfacine, Placebo
Drug
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years to 60 Years
Enrollment
29 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1995 – 1997
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 9, 2017 · Synced Sep 5, 2026, 5:26 PM EDT
Recruiting Phase 2 Interventional

ACE-D Aim 3 Clinical Cognitive Trial to Enhance Translation in Depression

NCT06408246
View directory record Official record
Conditions
Depression
Interventions
Guanfacine, Sertraline
Drug
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 60 Years
Enrollment
162 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
2
States / cities
Palo Alto, California • Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 4, 2026 · Synced Sep 5, 2026, 5:26 PM EDT
Recruiting Phase 4 Interventional

AWARE: Management of ADHD in Autism Spectrum Disorder

NCT05916339
View directory record Official record
Conditions
ADHD, Autism Spectrum Disorder
Interventions
Randomization to either Amphetamine (AMP) class of stimulant medication or Methylphenidate (MPH) class of stimulant medication, Randomization to either Alpha 2 agonist class of medication or alternate class of stimulant.
Drug
Lead sponsor
Daniel Coury
Other
Eligibility
4 Years to 17 Years
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
10
States / cities
Irvine, California • Los Angeles, California • Portland, Maine + 7 more
Source: ClinicalTrials.gov public record
Updated Oct 28, 2025 · Synced Sep 5, 2026, 5:26 PM EDT