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Showing 1–11 of 11 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Viagra® Clear all
Completed Phase 1 Interventional Accepts healthy volunteers

A Study to Compare the Blood Levels of Sildenafil Following Administration of an Experimental Tablet vs. the Conventional Oral Tablet in Healthy Subjects

NCT00866463
View directory record Official record
Conditions
Erectile Dysfunction
Interventions
Sildenafil
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Jan 31, 2021 · Synced Sep 7, 2026, 7:24 PM EDT
Terminated Phase 2 Interventional Accepts healthy volunteers

Cerebrovascular Reactivity Assessed With fNIRS as a Biomarker of TCVI After Acute Traumatic Brain Injury in Military

NCT04058132
View directory record Official record
Conditions
Traumatic Brain Injury
Interventions
Sildenafil Citrate 50Mg Tab, functional Near-infrared Spectroscopy (fNIRS), Carbon Dioxide (CO2) 5%, Neuropsychological Assessments, Gadolinium contrast infusion, Blood sample collection for research purposes, Structural brain Magnetic Resonance Imaging (MRI
Drug · Device · Other + 1 more
Lead sponsor
Uniformed Services University of the Health Sciences
Federal
Eligibility
18 Years to 55 Years
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 27, 2024 · Synced Sep 7, 2026, 7:24 PM EDT
Completed No phase listed Observational Results available

Study of Incidence of Respiratory Tract AEs in Patients Treated With Tyvaso® Compared to Other FDA Approved PAH Therapies

NCT01266265
View directory record Official record
Conditions
Pulmonary Arterial Hypertension
Interventions
inhaled prostacyclin, prostacyclin, subcutaneous and intravenous prostacyclin, oral ERA, oral PDE5 inhibitors
Drug
Lead sponsor
United Therapeutics
Industry
Eligibility
Not listed
Enrollment
1,333 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
88
States / cities
Birmingham, Alabama • Mobile, Alabama • Phoenix, Arizona + 65 more
Source: ClinicalTrials.gov public record
Updated Feb 16, 2016 · Synced Sep 7, 2026, 7:24 PM 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 11, 2025 · Synced Sep 7, 2026, 7:24 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Study to Compare the Blood Levels of Sildenafil Following Administration of an Experimental Tablet vs. the Conventional Oral Tablet in Healthy Subjects.

NCT00795938
View directory record Official record
Conditions
Erectile Dysfunction
Interventions
Sildenafil
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Jan 31, 2021 · Synced Sep 7, 2026, 7:24 PM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

The Objective of This Phase 1 Study is to Evaluate the Food Effect of 100 mg Hezkue Turbo® (ASP-001.1, Sildenafil) Under Fed Versus 100 mg of Hezkue Turbo® (ASP-001.1, Sildenafil) Under Fasted Conditions in Healthy Adult Male Subjects

NCT06872866
View directory record Official record
Conditions
Erectile Dysfunction
Interventions
ASP-001.1, ASP-001.1
Drug · Device
Lead sponsor
Aspargo Labs, Inc
Industry
Eligibility
20 Years to 70 Years · Male only
Enrollment
12 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 18, 2025 · Synced Sep 7, 2026, 7:24 PM 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 18, 2015 · Synced Sep 7, 2026, 7:24 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Taste Test of a New Formulation of Sildenafil (Revatio)

NCT00768573
View directory record Official record
Conditions
None Volunteer
Interventions
sildenafil
Drug
Lead sponsor
Pfizer's Upjohn has merged with Mylan to form Viatris Inc.
Industry
Eligibility
18 Years to 75 Years
Enrollment
4 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Cambridge, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 31, 2021 · Synced Sep 7, 2026, 7:24 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 Jan 31, 2021 · Synced Sep 7, 2026, 7:24 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 19, 2025 · Synced Sep 7, 2026, 7:24 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

The Effect of Sildenafil Citrate (Viagra® (Registered Trademark)) on Brain Blood Flow in Multiple Sclerosis Patients

NCT00094068
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Not listed
Lead sponsor
National Institutes of Health Clinical Center (CC)
NIH
Eligibility
Not listed
Enrollment
76 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2006
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 7, 2026, 7:24 PM EDT