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 are retrieved from ClinicalTrials.gov and synchronized into the directory. Search pages remain noindex by default.

Clear filters
ClinicalTrials.gov public records Last synced Sep 9, 2026, 1:27 AM EDT

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

Showing 1–24 of 103 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Intervention: Placebo sildenafil Clear all
Terminated Phase 2 Interventional Results available

Sildenafil (Viagra) for the Treatment of Dyskinesias in Parkinson's Disease

NCT02162979
View directory record Official record
Conditions
Parkinson's Disease
Interventions
sildenafil, Placebo
Drug
Lead sponsor
Loma Linda University
Other
Eligibility
18 Years to 80 Years
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2009
U.S. locations
1
States / cities
Loma Linda, California
Source: ClinicalTrials.gov public record
Updated Mar 29, 2018 · Synced Sep 9, 2026, 1:27 AM EDT
Recruiting Early Phase 1 Interventional

Sildenafil to Reduce Vascular Remodeling During Left Ventricular Assist Device Support

NCT06510322
View directory record Official record
Conditions
Vascular Diseases
Interventions
Sildenafil, Placebo
Drug · Other
Lead sponsor
Montefiore Medical Center
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2029
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Jan 22, 2026 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Phase 3 Interventional Results available

Study of Sildenafil Citrate During and After Radiotherapy/Hormone Therapy for Erectile Function Versus Radiotherapy/Hormone Therapy for Prostate Cancer

NCT00142506
View directory record Official record
Conditions
Prostate Cancer, Erectile Dysfunction
Interventions
sildenafil citrate and questionaires, placebo tablets and questionaires
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
Male only
Enrollment
290 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2014
U.S. locations
5
States / cities
Basking Ridge, New Jersey • Commack, New York • New York, New York + 2 more
Source: ClinicalTrials.gov public record
Updated Oct 19, 2017 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Not applicable Interventional Results available

Phosphodiesterase Type 5 Inhibition to Improve Endothelial Function and Vascular Remodeling in Chronic Kidney Disease and End Stage Renal Disease Patients Requiring New Arteriovenous Fistula

NCT02414204
View directory record Official record
Conditions
Improve Endothelial Function and Decrease Vascular Stenosis
Interventions
Sildenafil, Placebo
Drug · Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
19 Years to 99 Years
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Aug 11, 2019 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Use of Sildenafil (Viagra) to Alter Fatigue, Functional Status and Impaired Cerebral Blood Flow in Patients With CFS

NCT00598585
View directory record Official record
Conditions
Chronic Fatigue Syndrome
Interventions
Sildenafil (Viagra), Placebo
Drug
Lead sponsor
Charles Drew University of Medicine and Science
Other
Eligibility
18 Years to 49 Years
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2002 – 2010
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 26, 2017 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Phase 2 Interventional

Study to Investigate Effect of Sildenafil on Clitoral Engorgement as Measured by Magnetic Resonance Imaging (MRI) in Pre-menopausal Women With Female Sexual Arousal Disorder

NCT00640458
View directory record Official record
Conditions
Female Sexual Arousal Disorder
Interventions
Sildenafil 100 mg, Placebo
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years to 45 Years · Female only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2007
U.S. locations
2
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jan 31, 2021 · Synced Sep 9, 2026, 1:27 AM EDT
Not listed Phase 4 Interventional

Can Hyperbaric Oxygen Improve Erectile Function Following Surgery for Prostate Cancer

NCT00906269
View directory record Official record
Conditions
Impotence, Prostatic Neoplasms
Interventions
Sildenafil therapy plus post-NSRRP HBO2T, Sildenafil therapy plus sham post-NSRRP HBO2T
Drug
Lead sponsor
Hartford Hospital
Other
Eligibility
40 Years to 65 Years · Male only
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2021
U.S. locations
1
States / cities
Hartford, Connecticut
Source: ClinicalTrials.gov public record
Updated May 19, 2019 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

The Effect of Sildenafil and Tadalafil on Skeletal Muscle and Perceptual Fatigue

NCT01661595
View directory record Official record
Conditions
Fatigue
Interventions
Sildenafil, tadalafil, Placebo
Drug
Lead sponsor
The University of Texas Medical Branch, Galveston
Other
Eligibility
50 Years to 60 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2015
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 16, 2018 · Synced Sep 9, 2026, 1:27 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 4, 2017 · Synced Sep 9, 2026, 1:27 AM EDT
Terminated Phase 1 Interventional

Study of Low Dose Nesiritide With or Without Sildenafil in Congestive Heart Failure Patients With Renal Dysfunction

NCT00818701
View directory record Official record
Conditions
Congestive Heart Failure, Renal Dysfunction
Interventions
low dose Nesiritide, nesiritide, Sildenafil
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 90 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
2
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Sep 23, 2010 · Synced Sep 9, 2026, 1:27 AM EDT
Recruiting Phase 2 Interventional

Sildenafil for Microvasculopathy in Chronic TBI

NCT05782244
View directory record Official record
Conditions
Traumatic Brain Injury
Interventions
Sildenafil Citrate low dose, Placebo, Sildenafil medium dose, Sildenafil high dose
Drug
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years to 70 Years
Enrollment
160 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Dec 9, 2025 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Not applicable Interventional

Sildenafil in Treating Erectile Dysfunction in Patients With Prostate Cancer

NCT00057759
View directory record Official record
Conditions
Prostate Cancer, Psychosocial Effects of Cancer and Its Treatment, Radiation Toxicity, Sexual Dysfunction, Sexuality and Reproductive Issues
Interventions
sildenafil citrate, Placebo
Drug · Other
Lead sponsor
Radiation Therapy Oncology Group
Network
Eligibility
18 Years and older · Male only
Enrollment
115 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2003
U.S. locations
30
States / cities
Concord, California • Inglewood, California • Walnut Creek, California + 23 more
Source: ClinicalTrials.gov public record
Updated Nov 16, 2015 · Synced Sep 9, 2026, 1:27 AM EDT
Terminated Phase 3 Interventional Results available

Sitaxsentan Efficacy And Safety Trial With A Randomized Prospective Assessment Of Adding Sildenafil (SR-PAAS)

NCT00795639
View directory record Official record
Conditions
Pulmonary Arterial Hypertension, Pulmonary Hypertension
Interventions
Sitaxsentan, Placebo
Drug
Lead sponsor
Pfizer
Industry
Eligibility
16 Years to 80 Years
Enrollment
183 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
32
States / cities
Fountain Valley, California • Mather, California • Sacramento, California + 28 more
Source: ClinicalTrials.gov public record
Updated Mar 23, 2015 · Synced Sep 9, 2026, 1:27 AM EDT
Recruiting Phase 2 Interventional

A Trial of Phosphodiesterase-5 Inhibitor in Neonatal Congenital Diaphragmatic Hernia (TOP-CDH)

NCT05201144
View directory record Official record
Conditions
Congenital Diaphragmatic Hernia, Pulmonary Hypertension
Interventions
Sildenafil Oral Suspension, Placebo
Drug · Other
Lead sponsor
University of Utah
Other
Eligibility
Not listed
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Apr 3, 2025 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Phase 1 Interventional

Growth Hormone or Sildenafil as Therapies for Fatigue in Mild- Traumatic-brain-injury (MTBI)

NCT02114775
View directory record Official record
Conditions
Traumatic Brain Injury
Interventions
Growth Hormone, Sildenafil, Placebo
Drug
Lead sponsor
The University of Texas Medical Branch, Galveston
Other
Eligibility
18 Years to 60 Years
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Feb 4, 2018 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Smoking Cessation and Functional CT Assessment

NCT03382106
View directory record Official record
Conditions
Emphysema
Interventions
Sildenafil 20 MG, Placebo Oral Tablet, Pulse wave velocity, Carotid artery compliance and stiffness, Pressure wave reflection
Drug · Diagnostic Test
Lead sponsor
Eric A. Hoffman
Other
Eligibility
21 Years to 65 Years
Enrollment
162 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2024
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Feb 13, 2025 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Phase 2 Interventional Results available

The Effect Of NS-0200 and NS-0300 Versus Placebo on Weight In Obesity

NCT03364335
View directory record Official record
Conditions
Obesity
Interventions
Leu Sil 1.0mg, Leu Sil 4.0mg, Leu Met Sil 1.0mg, Leu Met Sil 4.0mg, Placebo
Drug
Lead sponsor
NuSirt Biopharma
Industry
Eligibility
18 Years to 65 Years
Enrollment
267 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
15
States / cities
Mobile, Alabama • Montclair, California • Sacramento, California + 12 more
Source: ClinicalTrials.gov public record
Updated Aug 20, 2019 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Not applicable Interventional Results available

Nebivolol in the Supine Hypertension of Autonomic Failure

NCT01044693
View directory record Official record
Conditions
Hypertension, Pure Autonomic Failure, Multiple System Atrophy
Interventions
Placebo, Nebivolol 5 mg, metoprolol tartrate 50 mg, Sildenafil25 mg
Drug
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 80 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 30, 2015 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Early Phase 1 Interventional Results available

Sildenafil To Prevent Clot

NCT03199612
View directory record Official record
Conditions
Thrombosis, Hemolysis
Interventions
Sildenafil, Placebo Oral Tablet
Drug
Lead sponsor
Montefiore Medical Center
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Jul 9, 2024 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Assess the Effect of Daily Treatment of Vardenafil 20mg or Sildenafil 100mg and Placebo on Sperm Function

NCT00655590
View directory record Official record
Conditions
Erectile Dysfunction
Interventions
Levitra (Vardenafil, BAY38-9456), Sildenafil, Placebo
Drug
Lead sponsor
Bayer
Industry
Eligibility
25 Years to 64 Years · Male only
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2006
U.S. locations
18
States / cities
Phoenix, Arizona • Tempe, Arizona • Beverly Hills, California + 15 more
Source: ClinicalTrials.gov public record
Updated Dec 29, 2014 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

The Effects of Sildenafil on Exercise Function and Capacity in Patients With Fontan Circulation

NCT00964782
View directory record Official record
Conditions
Fontan Circulation
Interventions
Sildenafil, Placebo, Sildenafil 2, Placebo 2
Drug
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
6 Years to 17 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
Hershey, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 25, 2019 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Not applicable Interventional Results available

Pharmacologic Treatment of Congenital Nephrogenic Diabetes Insipidus

NCT00478335
View directory record Official record
Conditions
Nephrogenic Diabetes Insipidus
Interventions
sildenafil, calcitonin, hydrochlorothiazide/amiloride, indomethacin, Placebo for sildenafil, placebo for calcitonin
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
5 Years to 25 Years · Male only
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2012
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Feb 11, 2018 · Synced Sep 9, 2026, 1:27 AM EDT
Completed Phase 1 Interventional

Sildenafil Citrate Before Surgery in Improving Kidney Function in Patients With Kidney Cancer

NCT01950923
View directory record Official record
Conditions
Kidney Tumor
Interventions
sildenafil citrate, placebo, therapeutic conventional surgery
Drug · Other · Procedure
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 2, 2018 · Synced Sep 9, 2026, 1:27 AM EDT
Active, not recruiting Phase 1 Interventional Accepts healthy volunteers

Use of Sildenafil for Treatment of Urinary Incontinence

NCT02983461
View directory record Official record
Conditions
Urinary Incontinence
Interventions
Sildenafil, Placebo
Drug
Lead sponsor
The University of Texas Medical Branch, Galveston
Other
Eligibility
50 Years to 80 Years · Female only
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2028
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Aug 5, 2026 · Synced Sep 9, 2026, 1:27 AM EDT