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ClinicalTrials.gov public records Last synced Oct 13, 2026, 10:24 PM EDT

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Showing 145–168 of 177 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Viagra (sildenafil citrate) Clear all
Active, not recruiting Phase 4 Interventional

Delayed Dose Collagenase Clostridium Histolyticum (CCH) Protocol for Men With Peyronie's Disease

NCT06649539
View directory record Official record
Conditions
Peyronie Disease
Interventions
Collagenase Clostridium Histolyticum, RestoreX, Sildenafil
Drug · Device
Lead sponsor
Charitable Union for the Research and Education of Peyronie's Disease
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
1
States / cities
Orem, Utah
Source: ClinicalTrials.gov public record
Updated Aug 26, 2026 · Synced Oct 13, 2026, 10:24 PM EDT
Completed Phase 3 Interventional Results available

Pharmacokinetic Effects of QTI571 on Sildenafil and Bosentan in Pulmonary Arterial Hypertension Participants

NCT01392469
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
Imatinib, Sildenafil, Bosentan
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years and older
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
3
States / cities
Tampa, Florida • Weston, Florida • Mineola, New York
Source: ClinicalTrials.gov public record
Updated Jun 21, 2021 · Synced Oct 13, 2026, 10:24 PM EDT
Terminated Phase 2 Interventional Results available

A Research Study To Assess The Effectiveness And Safety Of Different Doses Of Oral PF-00489791 In The Treatment Of Adult Patients With Pulmonary Arterial Hypertension

NCT00853112
View directory record Official record
Conditions
Hypertension, Pulmonary
Interventions
PF-00489791, placebo, sildenafil
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
8
States / cities
Phoenix, Arizona • Gainesville, Florida • Omaha, Nebraska + 2 more
Source: ClinicalTrials.gov public record
Updated Oct 24, 2017 · Synced Oct 13, 2026, 10:24 PM 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 13, 2026, 10:24 PM EDT
Completed Phase 4 Interventional

A Multicenter, Double-blind Study to Evaluate the Effect of Pretreatment With a Daily Dose of Sildenafil on the As-Needed Efficacy of Viagra in Men With Erectile Dysfunction and Type 2 Diabetes

NCT00645268
View directory record Official record
Conditions
Erectile Dysfunction, Diabetes Mellitus, Type 2
Interventions
sildenafil, placebo
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
35 Years to 70 Years · Male only
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2004
U.S. locations
28
States / cities
Huntsville, Alabama • Phoenix, Arizona • Beverly Hills, California + 21 more
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Oct 13, 2026, 10:24 PM EDT
Not yet recruiting Phase 1 Interventional Accepts healthy volunteers

Study to Compare the Effects of Viagra® Vs Hezkue® in Healthy Fasted Male Participants.

NCT06782659
View directory record Official record
Conditions
Erectile Dysfunction
Interventions
ASP-001, Viagra, ASP-001
Drug · Device
Lead sponsor
Aspargo Labs, Inc
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
56 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025
U.S. locations
2
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Jan 20, 2025 · Synced Oct 13, 2026, 10:24 PM EDT
Completed Phase 1 Interventional

Study of Regorafenib and Sildenafil for Advanced Solid Tumors

NCT02466802
View directory record Official record
Conditions
Solid Tumor
Interventions
Regorafenib, Sildenafil Citrate
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 20, 2020 · Synced Oct 13, 2026, 10:24 PM 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 9, 2018 · Synced Oct 13, 2026, 10:24 PM 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 24, 2019 · Synced Oct 13, 2026, 10:24 PM EDT
Completed No phase listed Observational

Pulmonary Hypertension in Trisomy 21 Patients

NCT00478296
View directory record Official record
Conditions
Congenital Disorders
Interventions
Not listed
Lead sponsor
Children's Healthcare of Atlanta
Other
Eligibility
Up to 8 Days
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2008
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Mar 16, 2012 · Synced Oct 13, 2026, 10:24 PM 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 22, 2015 · Synced Oct 13, 2026, 10:24 PM 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 10, 2024 · Synced Oct 13, 2026, 10:24 PM EDT
Completed Early Phase 1 Interventional

Topical Sildenafil as Pre-Treatment for Hand-Foot Skin Reaction

NCT03229512
View directory record Official record
Conditions
Hand Foot Skin Reaction
Interventions
Sildenafil
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
2
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Nov 1, 2021 · Synced Oct 13, 2026, 10:24 PM 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 13, 2026, 10:24 PM 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 12, 2019 · Synced Oct 13, 2026, 10:24 PM 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 13, 2026, 10:24 PM 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 13, 2026, 10:24 PM 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 13, 2026, 10:24 PM 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 13, 2026, 10:24 PM 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 13, 2026, 10:24 PM EDT
Not listed Phase 1 Interventional

Sildenafil for DCI

NCT03028298
View directory record Official record
Conditions
Subarachnoid Hemorrhage, Cerebral Vasospasm
Interventions
Low dose sildenafil citrate, High dose sildenafil citrate
Drug
Lead sponsor
University of Mississippi Medical Center
Other
Eligibility
21 Years and older
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2023
U.S. locations
1
States / cities
Jackson, Mississippi
Source: ClinicalTrials.gov public record
Updated Jun 8, 2021 · Synced Oct 13, 2026, 10:24 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Safety, Tolerability, and PK Parameters of Sodium Nitrite Inhalation Solution in Healthy Subjects

NCT01409122
View directory record Official record
Conditions
Pulmonary Hypertension, Pulmonary Arterial Hypertension
Interventions
15 mg sodium nitrite inhalation solution, 90 mg sodium nitrite inhalation solution, 45 mg sodium nitrite inhalation solution, 120 mg sodium nitrite inhalation solution, 25% MTD sodium nitrite inhalation solution
Drug
Lead sponsor
Aires Pharmaceuticals, Inc.
Industry
Eligibility
18 Years to 56 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2012
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Nov 9, 2012 · Synced Oct 13, 2026, 10:24 PM EDT
Completed Phase 2Phase 3 Interventional Results available

Sildenafil Exercise: Role of PDE5 Inhibition

NCT04039087
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Sildenafil 40mg oral capsule, Placebo Oral capsule
Drug
Lead sponsor
National Jewish Health
Other
Eligibility
9 Years and older
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
2
States / cities
Denver, Colorado • Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Aug 28, 2026 · Synced Oct 13, 2026, 10:24 PM 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 13, 2026, 10:24 PM EDT