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ClinicalTrials.gov public records Last synced Oct 7, 2026, 8:03 AM EDT

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Showing 25–48 of 71 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: placebo for sildenafil citrate Clear all
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 17, 2015 · Synced Oct 7, 2026, 8:03 AM EDT
Terminated Phase 2 Interventional Results available

Does Sildenafil Improve Endothelial Dysfunction in Rheumatoid Arthritis?

NCT02908490
View directory record Official record
Conditions
Arthritis, Rheumatoid, Atherosclerosis
Interventions
Sildenafil, Placebo
Drug · Other
Lead sponsor
Kimberly Liang
Other
Eligibility
18 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 13, 2021 · Synced Oct 7, 2026, 8:03 AM EDT
Completed Phase 3 Interventional Results available

Sildenafil Trial of Exercise Performance in Idiopathic Pulmonary Fibrosis

NCT00517933
View directory record Official record
Conditions
Pulmonary Fibrosis, Hypertension, Pulmonary
Interventions
Sildenafil Citrate, Placebo
Drug · Other
Lead sponsor
Duke University
Other
Eligibility
18 Years and older
Enrollment
180 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
13
States / cities
Birmingham, Alabama • Los Angeles, California • San Francisco, California + 10 more
Source: ClinicalTrials.gov public record
Updated Jun 24, 2015 · Synced Oct 7, 2026, 8:03 AM EDT
Terminated Early Phase 1 Interventional Accepts healthy volunteers Results available

Vascular Dysfunction in Black Individuals: Roles of Nitric Oxide and Endothelin-1

NCT04770155
View directory record Official record
Conditions
Vascular Function, Racial Disparity
Interventions
Dietary Nitrates 400 mg, L-citrulline 3 g, Sildenafil 100 mg, Bosentan 125 mg
Dietary Supplement · Drug
Lead sponsor
University of Mississippi Medical Center
Other
Eligibility
18 Years to 40 Years
Enrollment
8 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Oct 31, 2023 · Synced Oct 7, 2026, 8:03 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 14, 2025 · Synced Oct 7, 2026, 8:03 AM EDT
Terminated Phase 2 Interventional Results available

Revatio for Heart Disease in Duchenne Muscular Dystrophy and Becker Muscular Dystrophy

NCT01168908
View directory record Official record
Conditions
Duchenne Muscular Dystrophy, Becker Muscular Dystrophy
Interventions
Sildenafil
Drug
Lead sponsor
Hugo W. Moser Research Institute at Kennedy Krieger, Inc.
Other
Eligibility
18 Years to 50 Years · Male only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 26, 2019 · Synced Oct 7, 2026, 8:03 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Study to Evaluate Hemodynamic Response to to a Sublingual Dose of Glyceryl Trinitrate in Subjects Receiving TA-1790, Sildenafil Citrate, and Placebo

NCT01616485
View directory record Official record
Conditions
Erectile Dysfunction
Interventions
TA-1790, Sildenafil citrate, Placebo, Nitrostat
Drug
Lead sponsor
VIVUS LLC
Industry
Eligibility
30 Years to 60 Years · Male only
Enrollment
106 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004
U.S. locations
1
States / cities
Phoenix, Arizona
Source: ClinicalTrials.gov public record
Updated Jun 14, 2012 · Synced Oct 7, 2026, 8:03 AM EDT
Completed Phase 4 Interventional Results available

Study of Effects of Sildenafil on Patients With Fontan Heart Circulation

NCT01815502
View directory record Official record
Conditions
Single Ventricle Heart Disease After Fontan Surgery
Interventions
Cardiac catheterization
Diagnostic Test
Lead sponsor
Medical University of South Carolina
Other
Eligibility
3 Years to 40 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Dec 7, 2018 · Synced Oct 7, 2026, 8:03 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 4, 2025 · Synced Oct 7, 2026, 8:03 AM EDT
Completed Phase 4 Interventional Results available

Effect of Prolonged PDE-5 Inhibition on Insulin Signaling in Skeletal Muscle.

NCT02129725
View directory record Official record
Conditions
Metabolic Syndrome
Interventions
Sildenafil citrate, Placebo Oral Capsule
Drug
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 19, 2017 · Synced Oct 7, 2026, 8:03 AM EDT
Withdrawn Phase 1 Interventional

Study of Sildenafil as a Therapy for Fatigue in Pancreatic Cancer

NCT02106871
View directory record Official record
Conditions
Pancreatic Cancer, Cholangiocarcinoma
Interventions
Sildenafil
Drug
Lead sponsor
The University of Texas Medical Branch, Galveston
Other
Eligibility
40 Years to 75 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Oct 27, 2017 · Synced Oct 7, 2026, 8:03 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 7, 2026, 8:03 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Role of Skeletal Muscle Nitric Oxide Production in Age-related Fatigue and Fatigability

NCT01059994
View directory record Official record
Conditions
Fatigue, Aging
Interventions
Placebo sildenafil, Sildenafil
Drug
Lead sponsor
The University of Texas Medical Branch, Galveston
Other
Eligibility
20 Years to 80 Years · Male only
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2013
U.S. locations
1
States / cities
Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Feb 11, 2019 · Synced Oct 7, 2026, 8:03 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 20, 2019 · Synced Oct 7, 2026, 8:03 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 21, 2019 · Synced Oct 7, 2026, 8:03 AM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

Sildenafil Treatment for Mild TBI

NCT03598140
View directory record Official record
Conditions
Vascular System Injuries, Concussion, Brain, Post-Concussion Syndrome
Interventions
Sildenafil Citrate, Placebo oral capsule
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years to 35 Years · Male only
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Nov 19, 2020 · Synced Oct 7, 2026, 8:03 AM EDT
Terminated Early Phase 1 Interventional Results available

Testosterone for Penile Rehabilitation After Radical Prostatectomy

NCT00848497
View directory record Official record
Conditions
Hypogonadism, Erectile Dysfunction
Interventions
Testim®, Placebo Testim®, Viagra®
Drug · Other
Lead sponsor
Mohit Khera
Other
Eligibility
18 Years and older · Male only
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2013
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jun 19, 2015 · Synced Oct 7, 2026, 8:03 AM EDT
Completed Phase 3 Interventional

A New Sildenafil Oral Film in Patients With Erectile Dysfunction

NCT05490680
View directory record Official record
Conditions
Erectile Dysfunction
Interventions
Sildenafil Oral Film 25 mg, 50 mg, 75 mg or 100 mg, Placebo
Drug
Lead sponsor
IBSA Institut Biochimique SA
Industry
Eligibility
18 Years and older · Male only
Enrollment
488 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
18
States / cities
Foley, Alabama • Huntsville, Alabama • Little Rock, Arkansas + 14 more
Source: ClinicalTrials.gov public record
Updated Oct 23, 2025 · Synced Oct 7, 2026, 8:03 AM EDT
Completed Phase 4 Interventional Results available

Study of Add-on Ambrisentan Therapy to Background Phosphodiesterase Type-5 Inhibitor (PDE5i) Therapy in Pulmonary Arterial Hypertension (ATHENA-1)

NCT00617305
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
Ambrisentan, Placebo, Sildenafil, Tadalafil
Drug
Lead sponsor
Gilead Sciences
Industry
Eligibility
16 Years to 75 Years
Enrollment
38 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
30
States / cities
Mobile, Alabama • Phoenix, Arizona • Los Angeles, California + 25 more
Source: ClinicalTrials.gov public record
Updated Jul 30, 2012 · Synced Oct 7, 2026, 8:03 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Does Sildenafil Increase Exercise Performance in Air Pollution?

NCT00808912
View directory record Official record
Conditions
Pulmonary Hypertension, Pulmonary Artery Pressure, Exercise Performance, Air Pollution
Interventions
sildenafil, placebo
Drug · Other
Lead sponsor
Marywood University
Other
Eligibility
18 Years to 30 Years · Male only
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Scranton, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 23, 2010 · Synced Oct 7, 2026, 8:03 AM EDT
Recruiting Phase 2 Interventional

Sildenafil for Early Pulmonary Vascular Disease in Scleroderma

NCT04797286
View directory record Official record
Conditions
Scleroderma, Mildly Elevated Pulmonary Pressures
Interventions
Sildenafil, Placebo
Drug · Other
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
2
States / cities
New Orleans, Louisiana • Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 28, 2026 · Synced Oct 7, 2026, 8:03 AM EDT
Withdrawn Phase 4 Interventional

Pulmonary Hypertension Secondary to Idiopathic Pulmonary Fibrosis And Treatment With Sildenafil

NCT00625079
View directory record Official record
Conditions
Pulmonary Arterial Hypertension, Idiopathic Pulmonary Fibrosis, Interstitial Lung Disease, Pulmonary Hypertension
Interventions
sildenafil
Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
Not listed
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated May 1, 2018 · Synced Oct 7, 2026, 8:03 AM EDT
Completed Phase 2 Interventional Results available

Evaluation of the Pharmacodynamic Effect of the Combination of Sildenafil and Riociguat on Blood Pressure and Other Safety Parameters.

NCT01179334
View directory record Official record
Conditions
Pulmonary Hypertension
Interventions
Riociguat (Adempas, BAY63-2521), Placebo, Sildenafil
Drug
Lead sponsor
Bayer
Industry
Eligibility
18 Years to 75 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
3
States / cities
Aurora, Colorado • Columbus, Ohio • Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Aug 29, 2016 · Synced Oct 7, 2026, 8:03 AM EDT
Terminated Not applicable Interventional Results available

Pharmacological Penile Rehabilitation in the Preservation of Erectile Function Following Bilateral Nerve-Sparing Radical Prostatectomy

NCT00955929
View directory record Official record
Conditions
Penile Cancer, Erectile Dysfunction, Radical Prostatectomy
Interventions
Placebo QHS and sildenafil and questionnaires, Sildenafil and questionnaire, Trimix combination (Papavarine 30mg/mL Phentholamine 1mg/mL Prostaglandin E1 10 mcg/mmL) and questionnaires
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older · Male only
Enrollment
76 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2020
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 10, 2021 · Synced Oct 7, 2026, 8:03 AM EDT