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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Placebo sildenafil Clear all
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 17, 2026, 5:53 AM EDT
Terminated Phase 2 Interventional Results available

Sildenafil Therapy for Pulmonary Hypertension and Sickle Cell Disease

NCT00492531
View directory record Official record
Conditions
Sickle Cell Disease, Pulmonary Hypertension
Interventions
Sildenafil, Placebo
Drug
Lead sponsor
National Heart, Lung, and Blood Institute (NHLBI)
NIH
Eligibility
12 Years to 70 Years
Enrollment
74 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2009
U.S. locations
8
States / cities
Oakland, California • Denver, Colorado • Washington D.C., District of Columbia + 5 more
Source: ClinicalTrials.gov public record
Updated Jan 5, 2016 · Synced Sep 17, 2026, 5:53 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 17, 2026, 5:53 AM EDT
Completed Phase 2 Interventional Results available

Safety of Sildenafil in Premature Infants

NCT03142568
View directory record Official record
Conditions
Bronchopulmonary Dysplasia
Interventions
Sildenafil, Placebo
Drug · Other
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
7 Days to 28 Days
Enrollment
109 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2025
U.S. locations
14
States / cities
Little Rock, Arkansas • Jacksonville, Florida • Chicago, Illinois + 10 more
Source: ClinicalTrials.gov public record
Updated Mar 29, 2026 · Synced Sep 17, 2026, 5:53 AM EDT
Completed Phase 4 Interventional

A Placebo-Controlled Single-Dose Trial of Sildenafil in Schizophrenia

NCT00455715
View directory record Official record
Conditions
Schizophrenia
Interventions
Sildenafil
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 28, 2011 · Synced Sep 17, 2026, 5:53 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Open-Label, Within-Subject Dose-Escalation Study to Evaluate the Clinical Safety and Pharmacokinetic Profile of a Topical Sildenafil Cream (5% w/w), in Healthy Postmenopausal Women

NCT02364882
View directory record Official record
Conditions
Female Sexual Health
Interventions
Sildenafil
Drug
Lead sponsor
Strategic Science & Technologies, LLC
Industry
Eligibility
35 Years to 65 Years · Female only
Enrollment
21 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jun 21, 2015 · Synced Sep 17, 2026, 5:53 AM EDT
Terminated Phase 4 Interventional Results available

Renin-Angiotensin and Fibrinolysis in Humans: Effect of Long-Term PDE5 Inhibition on Glucose Homeostasis

NCT01409993
View directory record Official record
Conditions
Impaired Glucose Tolerance
Interventions
Sildenafil, Placebo, Hyperglycemic clamp, Euglycemic clamp
Drug · Diagnostic Test
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years and older
Enrollment
78 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2016
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 16, 2017 · Synced Sep 17, 2026, 5:53 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 17, 2026, 5:53 AM EDT
Completed Phase 3 Interventional Results available

A Randomized, Double-Blind, Placebo-Controlled Study of Sildenafil in Children With Pulmonary Arterial Hypertension.

NCT00159913
View directory record Official record
Conditions
Pulmonary Arterial Hypertension, Children
Interventions
Sildenafil citrate, Placebo
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
1 Year to 17 Years
Enrollment
235 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2008
U.S. locations
10
States / cities
Palo Alto, California • Stanford, California • Aurora, Colorado + 7 more
Source: ClinicalTrials.gov public record
Updated Feb 17, 2021 · Synced Sep 17, 2026, 5:53 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 25, 2019 · Synced Sep 17, 2026, 5:53 AM EDT
Completed Phase 4 Interventional Results available

Assess the Efficacy and Safety of Sildenafil When Added to Bosentan in the Treatment of Pulmonary Arterial Hypertension

NCT00323297
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
Bosentan, Placebo, Sildenafil Citrate
Drug · Other
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years and older
Enrollment
105 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2013
U.S. locations
6
States / cities
Los Angeles, California • Detroit, Michigan • Pittsburgh, Pennsylvania + 2 more
Source: ClinicalTrials.gov public record
Updated Jan 31, 2021 · Synced Sep 17, 2026, 5:53 AM EDT
Completed Phase 4 Interventional Results available

Effects of Viagra on Heart Function in Patients With Heart Failure

NCT00781508
View directory record Official record
Conditions
Heart Failure, Left Ventricular Dysfunction
Interventions
sildenafil, Placebo
Drug · Other
Lead sponsor
MetroHealth Medical Center
Other
Eligibility
25 Years to 75 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Jul 1, 2014 · Synced Sep 17, 2026, 5:53 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 17, 2026, 5:53 AM EDT
Not listed Phase 3 Interventional

Sildenafil in US Heart Failure Patients (SilHF-US)

NCT03460470
View directory record Official record
Conditions
Heart Failure, Pulmonary Hypertension
Interventions
Sildenafil, Placebo oral capsule
Drug
Lead sponsor
Hartford Hospital
Other
Eligibility
18 Years to 80 Years
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
1
States / cities
Hartford, Connecticut
Source: ClinicalTrials.gov public record
Updated Mar 8, 2018 · Synced Sep 17, 2026, 5:53 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 12, 2017 · Synced Sep 17, 2026, 5:53 AM EDT
Completed Phase 4 Interventional

Assessment Of Sildenafil On Erectile Function And Intercourse Satisfaction And To Validate A New Subject Questionnaire

NCT00147628
View directory record Official record
Conditions
Impotence
Interventions
sildenafil citrate, placebo for sildenafil citrate
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years and older · Male only
Enrollment
209 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2006
U.S. locations
20
States / cities
Huntsville, Alabama • San Diego, California • Aurora, Colorado + 17 more
Source: ClinicalTrials.gov public record
Updated Jan 31, 2021 · Synced Sep 17, 2026, 5:53 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 13, 2012 · Synced Sep 17, 2026, 5:53 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 10, 2019 · Synced Sep 17, 2026, 5:53 AM EDT
Completed Phase 3 Interventional Results available

A Study To Evaluate Safety And Efficacy Of IV Sildenafil In The Treatment Of Neonates With Persistent Pulmonary Hypertension Of The Newborn

NCT01720524
View directory record Official record
Conditions
Pulmonary Hypertension, Familial Persistent, of the Newborn
Interventions
placebo, iv sildenafil
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
0 Days to 4 Days
Enrollment
59 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2020
U.S. locations
20
States / cities
Little Rock, Arkansas • Sacramento, California • Washington D.C., District of Columbia + 8 more
Source: ClinicalTrials.gov public record
Updated Aug 15, 2021 · Synced Sep 17, 2026, 5:53 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 17, 2026, 5:53 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Evaluation and Treatment of Pulmonary Vascular Disease in Moderate to Severe CF

NCT02626182
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
sildenafil, placebo
Drug
Lead sponsor
National Jewish Health
Other
Eligibility
18 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 23, 2019 · Synced Sep 17, 2026, 5:53 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 17, 2026, 5:53 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Study of Sildenafil Citrate on Insulin Resistance in African American

NCT01334554
View directory record Official record
Conditions
Metabolic Syndrome, Obesity
Interventions
Sildenafil, Placebo
Drug
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 60 Years · Female only
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Mar 26, 2017 · Synced Sep 17, 2026, 5:53 AM EDT
Terminated Phase 2 Interventional Results available

Study of Sildenafil to Treat Newborns With Persistent Pulmonary Hypertension

NCT01409031
View directory record Official record
Conditions
Persistent Pulmonary Hypertension, Respiratory Failure
Interventions
Intravenous Sildenafil, Placebo
Drug · Other
Lead sponsor
University of Colorado, Denver
Other
Eligibility
Up to 72 Hours
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
7
States / cities
Aurora, Colorado • Chicago, Illinois • Buffalo, New York + 2 more
Source: ClinicalTrials.gov public record
Updated Jan 31, 2019 · Synced Sep 17, 2026, 5:53 AM EDT