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ClinicalTrials.gov public records Last synced Oct 10, 2026, 6:57 AM EDT

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Showing 49–72 of 177 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Sildenafil citrate (Viagra) Clear all
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 2, 2014 · Synced Oct 10, 2026, 6:57 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 10, 2026, 6:57 AM EDT
Completed Phase 3 Interventional

Study of Sildenafil in Patient With Heart Failure.

NCT00309816
View directory record Official record
Conditions
Congestive Heart Failure
Interventions
sildenafil
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 75 Years
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2006
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 3, 2006 · Synced Oct 10, 2026, 6:57 AM EDT
Completed Phase 2 Interventional Results available

Sildenafil Study to Treat Idiopathic Pulmonary Fibrosis

NCT00359736
View directory record Official record
Conditions
Alveolitis, Fibrosing, Fibrosis, Pulmonary, Hypertension, Pulmonary
Interventions
sildenafil
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
40 Years to 85 Years
Enrollment
29 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2009
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Nov 1, 2017 · Synced Oct 10, 2026, 6:57 AM EDT
Not yet recruiting Phase 1 Interventional Accepts healthy volunteers

Hezkue®, Hezkue Turbo®, and Commercial Sildenafil Products in Fed Healthy Male Subject

NCT07117383
View directory record Official record
Conditions
Erectile Dysfunction
Interventions
ASP-001.1, ASP-001, Commercial Sildenafil and Sildenafil/Tadalafil Products
Device · Drug
Lead sponsor
Aspargo Labs, Inc
Industry
Eligibility
18 Years to 70 Years · Male only
Enrollment
72 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Dec 12, 2025 · Synced Oct 10, 2026, 6:57 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 17, 2015 · Synced Oct 10, 2026, 6:57 AM EDT
Terminated Not applicable Interventional Results available

Improving Erectile Function and Quality of Life After Prostate Cancer Treatment

NCT01996852
View directory record Official record
Conditions
Prostate Cancer, Erectile Dysfunction Following Radical Prostatectomy, Erectile Dysfunction Following Simple Prostatectomy, Erectile Dysfunction
Interventions
Cognitive-behavioral Meetings, sildenafil citrate, Vacuum Constriction Device
Behavioral · Drug · Device
Lead sponsor
Case Comprehensive Cancer Center
Other
Eligibility
21 Years and older · Male only
Enrollment
34 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated May 10, 2019 · Synced Oct 10, 2026, 6:57 AM EDT
Completed Phase 4 Interventional Results available

Acute Hemodynamic Effects of Sildenafil in Patients With Severe Aortic Stenosis

NCT01060020
View directory record Official record
Conditions
Aortic Stenosis
Interventions
Sildenafil
Drug
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Apr 25, 2018 · Synced Oct 10, 2026, 6:57 AM EDT
Completed Phase 2 Interventional

Sildenafil Citrate in Waldenstrom's Macroglobulinemia

NCT00165295
View directory record Official record
Conditions
Waldenstrom's Macroglobulinemia
Interventions
Sildenafil citrate (Viagra)
Drug
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jun 27, 2011 · Synced Oct 10, 2026, 6:57 AM EDT
Completed Phase 4 Interventional

Mild To Moderate Erectile Dysfunction Study

NCT00137072
View directory record Official record
Conditions
Impotence
Interventions
Viagra (Sildenafil Citrate) 100 mg
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years to 70 Years · Male only
Enrollment
355 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2006
U.S. locations
33
States / cities
Birmingham, Alabama • Homewood, Alabama • Hoover, Alabama + 30 more
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Oct 10, 2026, 6:57 AM EDT
Terminated Phase 3 Interventional Results available

Study Providing Monotherapy (Sitaxsentan) And Combination Therapy (Sitaxsentan+Sildenafil) To Subjects With Pulmonary Arterial Hypertension (PAH) To Assess Long-Term Safety

NCT00796510
View directory record Official record
Conditions
Pulmonary Arterial Hypertension, Pulmonary Hypertension
Interventions
Sitaxsentan, Sitaxsentan and Sildenafil
Drug
Lead sponsor
Pfizer
Industry
Eligibility
16 Years to 80 Years
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2011
U.S. locations
1
States / cities
Fountain Valley, California
Source: ClinicalTrials.gov public record
Updated Oct 25, 2018 · Synced Oct 10, 2026, 6:57 AM EDT
Terminated Phase 2Phase 3 Interventional Results available

Targeting Vascular Reactivity in Idiopathic Pulmonary Fibrosis

NCT00981747
View directory record Official record
Conditions
Idiopathic Pulmonary Fibrosis, Pulmonary Fibrosis
Interventions
Sildenafil, Losartan, Sildenafil and Losartan, Placebo Oral Tablet
Drug
Lead sponsor
Alicia Gerke
Other
Eligibility
18 Years to 99 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2016
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Nov 13, 2018 · Synced Oct 10, 2026, 6:57 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 10, 2026, 6:57 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 3, 2018 · Synced Oct 10, 2026, 6:57 AM EDT
Recruiting Phase 1 Interventional

IMProving DRug Dosing and Outcomes for Single VEntricle Patients With Fontan Associated Liver Disease

NCT06324396
View directory record Official record
Conditions
Fontan Circulation
Interventions
Sildenafil 10mg oral tablet (participants <20kg), or 20mg oral tablet (participants ≥20kg), Pravastatin 20 mg oral tablet (ages <13 years), or 40 mg oral tablet (≥14 years)
Drug
Lead sponsor
Children's Mercy Hospital Kansas City
Other
Eligibility
8 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2026
U.S. locations
1
States / cities
Kansas City, Missouri
Source: ClinicalTrials.gov public record
Updated Jan 2, 2026 · Synced Oct 10, 2026, 6:57 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 30, 2014 · Synced Oct 10, 2026, 6:57 AM EDT
Completed Phase 1Phase 2 Interventional

Sildenafil for PNTM Infection

NCT01853540
View directory record Official record
Conditions
Nontuberculous Mycobacterial Infection
Interventions
Sildenafil
Drug
Lead sponsor
National Institute of Allergy and Infectious Diseases (NIAID)
NIH
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 25, 2015 · Synced Oct 10, 2026, 6:57 AM EDT
Completed Phase 1Phase 2 Interventional Results available

A Study to Evaluate Sildenafil for the Treatment of Lymphatic Malformations

NCT01290484
View directory record Official record
Conditions
Lymphangioma
Interventions
Sildenafil
Drug
Lead sponsor
Stanford University
Other
Eligibility
6 Months to 10 Years
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Jun 19, 2015 · Synced Oct 10, 2026, 6:57 AM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Non-invasive Measurement of Cerebrovascular Reactivity After Traumatic Brain Injury

NCT02990078
View directory record Official record
Conditions
TBI
Interventions
Sildenafil citrate, Functional Near Infared Spectroscopy, Hypercapnia Challenge
Drug · Device · Other
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2022
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 13, 2022 · Synced Oct 10, 2026, 6:57 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 26, 2019 · Synced Oct 10, 2026, 6:57 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Bioavailability of 3 Sildenafil Oral Disintegrating Tablet Formulations Compared to the Standard Oral Tablet

NCT00950404
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Viagra 50 mg tablet, Formulation B ODT tablet 50 mg, Formulation C ODT tablet 50 mg, Formulation D ODT tablet 50 mg
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years to 55 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Oct 10, 2026, 6:57 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

CD36 in Nutrient Delivery and Its Dysfunction

NCT03012386
View directory record Official record
Conditions
Insulin Resistance, Endothelial Dysfunction
Interventions
Sildenafil Citrate in G allele carrier, Sildenafil Citrate in non G allele carrier
Drug
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years to 50 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2021
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Nov 30, 2022 · Synced Oct 10, 2026, 6:57 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Renin-Angiotensin Aldosterone System and Fibrinolysis Interaction in Humans-Specific Aim 3

NCT00685945
View directory record Official record
Conditions
Obesity
Interventions
Control (bradykinin), L-NMMA + bradykinin, Isosorbide + L-NMMA + bradykinin, Sildenafil + L-NMMA + bradykinin
Drug
Lead sponsor
Vanderbilt University
Other
Eligibility
18 Years to 70 Years
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Feb 25, 2013 · Synced Oct 10, 2026, 6:57 AM EDT
Completed Phase 3 Interventional

A Study to Assess the Efficacy and Safety of 20, 40, and 80mg of Sildenafil Three Times a Day in the Treatment of Pulmonary Arterial Hypertension

NCT00644605
View directory record Official record
Conditions
Hypertension, Pulmonary
Interventions
sildenafil, placebo
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years and older
Enrollment
275 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2003
U.S. locations
24
States / cities
Birmingham, Alabama • La Jolla, California • Los Angeles, California + 15 more
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Oct 10, 2026, 6:57 AM EDT