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ClinicalTrials.gov public records Last synced Oct 14, 2026, 7:51 AM EDT

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Showing 121–144 of 177 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Sildenafil citrate (Viagra) Clear all
Terminated Phase 2 Interventional Accepts healthy volunteers Results available

Effects of Sildenafil on Choroidal Thickness in AMD

NCT01830790
View directory record Official record
Conditions
Age-related Macular Degeneration
Interventions
Sildenafil citrate
Drug
Lead sponsor
Duke University
Other
Eligibility
65 Years and older
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 23, 2015 · Synced Oct 14, 2026, 7:51 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 14, 2026, 7:51 AM EDT
Completed No phase listed Observational

Modulating Effects of Lisinopril on Sildenafil Activity in Pulmonary Arterial Hypertension(PAH)( MELISSA)

NCT01181284
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
Not listed
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 75 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2011
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Feb 7, 2012 · Synced Oct 14, 2026, 7:51 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Blood Flow and Vascular Function in Cystic Fibrosis

NCT02057458
View directory record Official record
Conditions
Cystic Fibrosis
Interventions
Sildenafil (Acute-1 hour), Sildenafil (Subchronic-4 weeks), Placebo
Drug
Lead sponsor
Augusta University
Other
Eligibility
18 Years and older
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2018
U.S. locations
1
States / cities
Augusta, Georgia
Source: ClinicalTrials.gov public record
Updated Apr 24, 2020 · Synced Oct 14, 2026, 7:51 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 14, 2026, 7:51 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 23, 2026 · Synced Oct 14, 2026, 7:51 AM EDT
Terminated Phase 4 Interventional Results available

To Assess The Efficacy and Safety Of Oral Sildenafil in the Treatment of Pulmonary Arterial Hypertension.

NCT00430716
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
Sildenafil citrate
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years and older
Enrollment
130 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
15
States / cities
Phoenix, Arizona • Augusta, Georgia • Decatur, Georgia + 7 more
Source: ClinicalTrials.gov public record
Updated Dec 22, 2020 · Synced Oct 14, 2026, 7:51 AM EDT
Completed Phase 4 Interventional Results available

Riociguat rEplacing PDE-5i Therapy evaLuated Against Continued PDE-5i thErapy

NCT02891850
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
Riociguat (Adempas, BAY63-2521), Sildenafil, Tadalafil
Drug
Lead sponsor
Bayer
Industry
Eligibility
18 Years to 75 Years
Enrollment
225 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
17
States / cities
Phoenix, Arizona • Tucson, Arizona • Sacramento, California + 14 more
Source: ClinicalTrials.gov public record
Updated Feb 26, 2021 · Synced Oct 14, 2026, 7:51 AM EDT
Completed Phase 1 Interventional

Treatment of Palmar Plantar Erythrodysesthesia (PPE) With Topical Sildenafil

NCT01219023
View directory record Official record
Conditions
Hand Foot Syndrome, Palmar Plantar Erythrodysesthesia
Interventions
sildenafil citrate
Drug
Lead sponsor
Duke University
Other
Eligibility
18 Years to 90 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Oct 30, 2012 · Synced Oct 14, 2026, 7:51 AM EDT
Terminated Phase 1 Interventional

Cerebrovascular Reactivity in American Football Players

NCT03417492
View directory record Official record
Conditions
Traumatic Brain Injury, Mild Traumatic Brain Injury, Post-Concussion Syndrome
Interventions
Sildenafil Citrate
Drug
Lead sponsor
University of Pennsylvania
Other
Eligibility
40 Years to 65 Years · Male only
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 21, 2022 · Synced Oct 14, 2026, 7:51 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 14, 2026, 7:51 AM EDT
Completed Phase 4 Interventional

Study Of Men With Mild To Moderate Erectile Dysfunction To Evaluate The Efficacy Of Viagra 8 Hours Post-Dose

NCT00143260
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
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2006
U.S. locations
25
States / cities
Birmingham, Alabama • Homewood, Alabama • Hoover, Alabama + 22 more
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Oct 14, 2026, 7:51 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 14, 2026, 7:51 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 Feb 1, 2021 · Synced Oct 14, 2026, 7:51 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 17, 2018 · Synced Oct 14, 2026, 7:51 AM EDT
Completed Phase 3 Interventional

Mono vs. Dual Therapy for Pediatric Pulmonary Arterial Hypertension

NCT04039464
View directory record Official record
Conditions
Pediatric Pulmonary Hypertension
Interventions
Mono-Therapy with Sildenafil, Duo-Therapy with Sildenafil + Bosentan
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
3 Months to 18 Years
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
10
States / cities
Aurora, Colorado • St. Petersburg, Florida • Baltimore, Maryland + 7 more
Source: ClinicalTrials.gov public record
Updated Feb 18, 2026 · Synced Oct 14, 2026, 7:51 AM EDT
Completed Phase 4 Interventional

Characterization of LV Strain Patterns in Mildly Elevated PCWP and PAH.

NCT01800292
View directory record Official record
Conditions
Hypertension, Pulmonary Artery, Ventricular Dysfunction, Left
Interventions
sildenafil
Drug
Lead sponsor
University of Arizona
Other
Eligibility
18 Years to 80 Years
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Nov 4, 2015 · Synced Oct 14, 2026, 7:51 AM EDT
Not yet recruiting Early Phase 1 Interventional

Asciminib With or Without Sildenafil for Brain Tumors

NCT07039760
View directory record Official record
Conditions
Brain Tumor
Interventions
Asciminib, Sildenafil, Surgical resection or biopsy
Drug · Procedure
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 39 Years
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Sep 11, 2026 · Synced Oct 14, 2026, 7:51 AM EDT
Active, not recruiting Phase 2 Interventional

Sildenafil for Treatment of Urinary Incontinence in Patients With Spinal Cord Injuries

NCT04565925
View directory record Official record
Conditions
Spinal Cord Injuries, Urinary Incontinence
Interventions
Sildenafil Citrate, Placebo
Drug
Lead sponsor
The University of Texas Medical Branch, Galveston
Other
Eligibility
18 Years to 70 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
2
States / cities
College Station, Texas • Galveston, Texas
Source: ClinicalTrials.gov public record
Updated Sep 9, 2026 · Synced Oct 14, 2026, 7:51 AM EDT
Completed No phase listed Observational Results available

A Study to Determine if There is a Possible Association Between NAION and Phosphodiesterase Type 5 (PDE5) Inhibitors

NCT01131104
View directory record Official record
Conditions
Nonarteritic Anterior Ischemic Optic Neuropathy
Interventions
PDE5 Inhibitors
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
18 Years and older · Male only
Enrollment
345 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
44
States / cities
Birmingham, Alabama • Los Altos, California • National City, California + 40 more
Source: ClinicalTrials.gov public record
Updated Apr 5, 2018 · Synced Oct 14, 2026, 7:51 AM EDT
Terminated Phase 4 Interventional Results available

Effects of Oral Sildenafil on Mortality in Adults With PAH

NCT02060487
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
sildenafil citrate
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years to 74 Years
Enrollment
385 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2021
U.S. locations
11
States / cities
Atlanta, Georgia • Grand Rapids, Michigan • Wooster, Ohio + 2 more
Source: ClinicalTrials.gov public record
Updated May 13, 2022 · Synced Oct 14, 2026, 7:51 AM EDT
Completed Phase 3 Interventional

Study to Assess the Longterm Safety of Sildenafil Citrate in Patients With Pulmonary Arterial Hypertension

NCT00159887
View directory record Official record
Conditions
Pulmonary Hypertension
Interventions
Sildenafil citrate
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years and older
Enrollment
260 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2007
U.S. locations
24
States / cities
Birmingham, Alabama • La Jolla, California • Los Angeles, California + 13 more
Source: ClinicalTrials.gov public record
Updated Feb 1, 2021 · Synced Oct 14, 2026, 7:51 AM EDT
Completed Phase 4 Interventional

An Open Label, Dose Finding Trial of Viagra for the Treatment of Neuropathic Pain (in Diabetes Mellitus)

NCT00194909
View directory record Official record
Conditions
Diabetic Neuropathy
Interventions
sildenafil (Viagra)
Drug
Lead sponsor
Weill Medical College of Cornell University
Other
Eligibility
18 Years and older
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2006
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 25, 2008 · Synced Oct 14, 2026, 7:51 AM EDT
Withdrawn Not applicable Interventional

Phosphodiesterase-5 (PDE-5) Inhibition in Heart Transplant Recipients

NCT01812434
View directory record Official record
Conditions
Cardiac Allograft Vasculopathy
Interventions
Sildenafil, Placebo
Drug
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2015
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Nov 1, 2019 · Synced Oct 14, 2026, 7:51 AM EDT