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 14, 2026, 5:47 AM EDT

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

Showing 97–120 of 177 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Sildenafil citrate (Viagra) Clear all
Completed Phase 3 Interventional Results available

A Study for Patients With Erectile Dysfunction to Test Whether Tadalafil Taken Once a Day Can Better Improve Psychological Outcomes.

NCT00734604
View directory record Official record
Conditions
Erectile Dysfunction
Interventions
tadalafil once a day [T(OaD)], sildenafil citrate as needed [S(PRN)], tadalafil as needed [T(PRN)]
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
18 Years and older · Male only
Enrollment
378 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
7
States / cities
Huntsville, Alabama • Newport Beach, California • Middlebury, Connecticut + 4 more
Source: ClinicalTrials.gov public record
Updated Nov 18, 2010 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 2 Interventional

Phase 2a Topical Sildenafil Proof-of-Concept Study in Men With Mild to Moderate ED

NCT02390960
View directory record Official record
Conditions
Erectile Dysfunction
Interventions
Sildenafil Cream, Placebo Cream, Penile Plethysmography (RigiScan)
Drug · Device
Lead sponsor
Strategic Science & Technologies, LLC
Industry
Eligibility
18 Years to 70 Years · Male only
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
3
States / cities
San Diego, California • New Orleans, Louisiana • New York, New York
Source: ClinicalTrials.gov public record
Updated Oct 12, 2017 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 2 Interventional Results available

Sildenafil for Treatment of Priapism in Men With Sickle Cell Anemia

NCT00940901
View directory record Official record
Conditions
Sickle Cell Disease, Priapism
Interventions
sildenafil, placebo
Drug · Other
Lead sponsor
Johns Hopkins University
Other
Eligibility
14 Years to 45 Years · Male only
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2013
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 13, 2017 · Synced Oct 14, 2026, 5:47 AM EDT
Terminated Phase 1 Interventional

Sildenafil and Stroke Recovery

NCT02628847
View directory record Official record
Conditions
Stroke
Interventions
sildenafil citrate, Placebo
Drug
Lead sponsor
University of Utah
Other
Eligibility
18 Years to 80 Years
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jan 5, 2017 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Lybrido for Female Sexual Dysfunction

NCT01432665
View directory record Official record
Conditions
Hypoactive Sexual Desire Disorder
Interventions
Placebo, Sildenafil, Testosterone
Drug
Lead sponsor
Emotional Brain NY Inc.
Industry
Eligibility
21 Years to 70 Years · Female only
Enrollment
196 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2011
U.S. locations
14
States / cities
San Diego, California • Washington D.C., District of Columbia • Brooksville, Florida + 11 more
Source: ClinicalTrials.gov public record
Updated Jul 29, 2013 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 1 Interventional Results available

Sildenafil in Single Ventricle Patients

NCT01169519
View directory record Official record
Conditions
Heart Disease
Interventions
Sildenafil by injection
Drug
Lead sponsor
Duke University
Other
Eligibility
3 Months to 120 Months
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Dec 5, 2013 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 2 Interventional

An Open-Label, Extension Study Evaluating the Safety, Toleration, and Efficacy of Sildenafil in Women With Sexual Arousal Disorder

NCT00746967
View directory record Official record
Conditions
Sexual Dysfunctions, Psychological, Sexual Arousal Disorder
Interventions
sildenafil
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years and older · Female only
Enrollment
267 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2004
U.S. locations
82
States / cities
Huntsville, Alabama • Anchorage, Alaska • Tucson, Arizona + 68 more
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Oct 14, 2026, 5:47 AM EDT
Completed No phase listed Observational

Thalassemia (Cooley's Anemia) Clinical Research Network (TCRN)

NCT00000623
View directory record Official record
Conditions
Anemia, Cooley's, Beta-Thalassemia, Hematologic Diseases, Thalassemia, Osteoporosis, Iron Overload, Hypertension, Pulmonary
Interventions
Deferoxamine, Deferiprone, Arginine, Sildenafil, Decitabine
Drug
Lead sponsor
Carelon Research
Other
Eligibility
1 Year to 75 Years
Enrollment
1,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2006
U.S. locations
4
States / cities
Oakland, California • Boston, Massachusetts • New York, New York + 1 more
Source: ClinicalTrials.gov public record
Updated Mar 4, 2014 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 3 Interventional Results available

Evaluating the Effectiveness of Sildenafil at Improving Health Outcomes and Exercise Ability in People With Diastolic Heart Failure (The RELAX Study)

NCT00763867
View directory record Official record
Conditions
Heart Failure
Interventions
Placebo, Sildenafil
Drug
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
216 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
9
States / cities
Phoenix, Arizona • Atlanta, Georgia • Boston, Massachusetts + 6 more
Source: ClinicalTrials.gov public record
Updated Jul 23, 2014 · Synced Oct 14, 2026, 5:47 AM EDT
Completed No phase listed Observational Results available

Study of Incidence of Respiratory Tract AEs in Patients Treated With Tyvaso® Compared to Other FDA Approved PAH Therapies

NCT01266265
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
inhaled prostacyclin, prostacyclin, subcutaneous and intravenous prostacyclin, oral ERA, oral PDE5 inhibitors
Drug
Lead sponsor
United Therapeutics
Industry
Eligibility
Not listed
Enrollment
1,333 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
88
States / cities
Birmingham, Alabama • Mobile, Alabama • Phoenix, Arizona + 65 more
Source: ClinicalTrials.gov public record
Updated Feb 17, 2016 · Synced Oct 14, 2026, 5:47 AM EDT
Completed No phase listed Observational

Sildenafil to Tadalafil in Pulmonary Arterial Hypertension (SITAR)

NCT01043627
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
Not listed
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
3
States / cities
Birmingham, Alabama • Torrance, California • Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Nov 5, 2012 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 2 Interventional Results available

Effects of Sildenafil on CFTR-dependent Ion Transport Activity

NCT01132482
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Sildenafil, Placebo
Drug
Lead sponsor
National Jewish Health
Other
Eligibility
18 Years and older
Enrollment
19 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Mar 19, 2019 · Synced Oct 14, 2026, 5:47 AM EDT
Terminated Phase 4 Interventional Results available

PDE5 Inhibitor Use and Non-arteritic Anterior Ischemic Optic Neuropathy (NAION)

NCT00867815
View directory record Official record
Conditions
Anterior Ischemic Optic Neuropathy
Interventions
Diagnostic procedures
Drug
Lead sponsor
Bayer
Industry
Eligibility
40 Years and older · Male only
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2018
U.S. locations
11
States / cities
Vista, California • Atlantis, Florida • Fort Myers, Florida + 7 more
Source: ClinicalTrials.gov public record
Updated Jan 23, 2019 · Synced Oct 14, 2026, 5:47 AM EDT
Completed No phase listed Observational

Eisenmenger's Syndrome in Adults With CHD

NCT00266903
View directory record Official record
Conditions
Congenital Disorders
Interventions
Not listed
Lead sponsor
Children's Healthcare of Atlanta
Other
Eligibility
18 Years and older
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1996 – 2008
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Dec 2, 2014 · Synced Oct 14, 2026, 5:47 AM EDT
Terminated Phase 4 Interventional

Trial of Viagra' in Men With Chronic Pelvic Pain Syndrome Type III

NCT00194597
View directory record Official record
Conditions
Prostatitis
Interventions
Viagra (sildenafil citrate)
Drug
Lead sponsor
University of Washington
Other
Eligibility
18 Years to 65 Years · Male only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2007
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Oct 22, 2008 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 4 Interventional

Study of Sildenafil for Treatment of SSRI-Antidepressant Sexual Dysfunction in Women

NCT00375297
View directory record Official record
Conditions
Sexual Dysfunction, Depression
Interventions
sildenafil
Drug
Lead sponsor
University of New Mexico
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2005
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Sep 12, 2006 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Single-Dose Relative Bioavailability Study of SST-6006, a Topical Sildenafil Cream Versus Oral Sildenafil in Healthy Male Adults

NCT01986673
View directory record Official record
Conditions
Healthy
Interventions
5% Sildenafil Cream (SST-6006), Oral Sildenafil 50 mg
Drug
Lead sponsor
Strategic Science & Technologies, LLC
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
62 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jan 27, 2014 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 2 Interventional Results available

Sildenafil for the Treatment of Lymphatic Malformations

NCT02335242
View directory record Official record
Conditions
Lymphatic Malformations, Lymphatic Diseases
Interventions
Sildenafil 20 mg tablets, Placebo tablets (resembling Revatio)
Drug · Other
Lead sponsor
Stanford University
Other
Eligibility
6 Months to 10 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2021
U.S. locations
3
States / cities
Stanford, California • Aurora, Colorado • Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 17, 2022 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Safety and Efficacy of Sildenafil in Cystic Fibrosis (CF) Lung Disease

NCT00659529
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
sildenafil
Drug
Lead sponsor
National Jewish Health
Other
Eligibility
14 Years and older
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated May 14, 2026 · Synced Oct 14, 2026, 5:47 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Taste Test of a New Formulation of Sildenafil (Revatio)

NCT00768573
View directory record Official record
Conditions
None Volunteer
Interventions
sildenafil
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years to 75 Years
Enrollment
4 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Cambridge, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Oct 14, 2026, 5:47 AM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Cerebrovascular Reactivity and Oxygen Metabolism as Markers of Neurodegeneration After Traumatic Brain Injury

NCT04820881
View directory record Official record
Conditions
Neurodegenerative Diseases
Interventions
Not listed
Lead sponsor
Washington D.C. Veterans Affairs Medical Center
Federal
Eligibility
50 Years to 80 Years
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Apr 27, 2022 · Synced Oct 14, 2026, 5:47 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

The Effect of Sildenafil Citrate (Viagra® (Registered Trademark)) on Brain Blood Flow in Multiple Sclerosis Patients

NCT00094068
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Not listed
Lead sponsor
National Institutes of Health Clinical Center (CC)
NIH
Eligibility
Not listed
Enrollment
76 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2006
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 4, 2008 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Sildenafil for Swimming-Induced Pulmonary Edema (SIPE) Prevention

NCT03686813
View directory record Official record
Conditions
Edema, Pulmonary, Immersion, Diving
Interventions
Sildenafil Citrate, Placebo Oral Tablet
Drug
Lead sponsor
Duke University
Other
Eligibility
18 Years to 45 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 22, 2022 · Synced Oct 14, 2026, 5:47 AM EDT
Completed Phase 3 Interventional Results available

The Efficacy and Safety of Sildenafil Citrate Used in Combination With Intravenous Epoprostenol in PAH

NCT00159861
View directory record Official record
Conditions
Pulmonary Hypertension
Interventions
Sildenafil citrate
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
16 Years and older
Enrollment
267 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2006
U.S. locations
33
States / cities
La Jolla, California • Los Angeles, California • San Diego, California + 21 more
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Oct 14, 2026, 5:47 AM EDT