Search | Clinical Trials Finder

These results were retrieved from the live ClinicalTrials.gov registry. Filters and sort order apply to this result list.

ClinicalTrials.gov public records Last synced Oct 2, 2026, 3:21 PM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Showing 25–44 of 44 matching trials from the live ClinicalTrials.gov search.

Filters: Intervention: Sildenafil (50 mg) Clear all

Conditions: Impotence, Prostatic Neoplasms
Interventions: Sildenafil therapy plus post-NSRRP HBO2T, Sildenafil therapy plus sham post-NSRRP HBO2T; Drug
Lead sponsor: Hartford Hospital; Other
Eligibility: 40 Years to 65 Years · Male only
Enrollment: 100 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2009 – 2021
U.S. locations: 1
States / cities: Hartford, Connecticut

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

Conditions: Pulmonary Fibrosis, Hypertension, Pulmonary
Interventions: Sildenafil (50 mg); Drug
Lead sponsor: National Heart, Lung, and Blood Institute (NHLBI); NIH
Eligibility: 19 Years and older
Enrollment: 20 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2004 – 2007
U.S. locations: 1
States / cities: Los Angeles, California

Conditions: Hypertension, Pure Autonomic Failure, Multiple System Atrophy
Interventions: Placebo, Nebivolol 5 mg, metoprolol tartrate 50 mg, Sildenafil25 mg; Drug
Lead sponsor: Vanderbilt University; Other
Eligibility: 18 Years to 80 Years
Enrollment: 20 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2010 – 2014
U.S. locations: 1
States / cities: Nashville, Tennessee

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

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

Conditions: Glioblastoma, Recurrent Adult Brain Neoplasm, Malignant Glioma, WHO Grade III Glioma
Interventions: sorafenib tosylate, valproic acid, sildenafil citrate; Drug
Lead sponsor: Virginia Commonwealth University; Other
Eligibility: 18 Years and older
Enrollment: 47 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2013 – 2023
U.S. locations: 1
States / cities: Richmond, Virginia

Conditions: Impotence
Interventions: Placebo, Viagra (sildenafil citrate); Drug
Lead sponsor: Pfizer's Upjohn has merged with Mylan to form Viatris Inc.; Industry
Eligibility: 30 Years and older · Male only
Enrollment: 371 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2006 – 2007
U.S. locations: 48
States / cities: Huntsville, Alabama • Mesa, Arizona • Phoenix, Arizona + 42 more

Conditions: Hypertension
Interventions: Clonidine, Nitroglycerin transdermal, Dipyridamole/ Aspirin (Aggrenox), Desmopressin (DDAVP), Sildenafil, Nifedipine, Hydralazine, Hydrochlorothiazide, Placebo, Bosentan, Diltiazem, Eplerenone, guanfacine, L-arginine, captopril, carbidopa, losartan, metoprolol tartrate, nebivolol hydrochloride, prazosin hydrochloride, tamsulosin hydrochloride, Head-up tilt., aliskiren, Local heat stress; Drug · Dietary Supplement · Other
Lead sponsor: Vanderbilt University; Other
Eligibility: 18 Years to 80 Years
Enrollment: 152 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2001 – 2017
U.S. locations: 1
States / cities: Nashville, Tennessee

Conditions: Sexual Dysfunctions, Psychological, Sexual Arousal Disorder
Interventions: sildenafil; Drug
Lead sponsor: Pfizer's Upjohn has merged with Mylan to form Viatris Inc.; Industry
Eligibility: 18 Years and older · Female only
Enrollment: 267 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2003 – 2004
U.S. locations: 82
States / cities: Huntsville, Alabama • Anchorage, Alaska • Tucson, Arizona + 68 more

Conditions: Erectile Dysfunction
Interventions: sildenafil, placebo; Drug
Lead sponsor: Pfizer's Upjohn has merged with Mylan to form Viatris Inc.; Industry
Eligibility: 21 Years and older
Enrollment: 300 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2003 – 2004
U.S. locations: 31
States / cities: Huntsville, Alabama • Little Rock, Arkansas • Beverly Hills, California + 26 more

Conditions: Chronic Fatigue Syndrome
Interventions: Sildenafil (Viagra), Placebo; Drug
Lead sponsor: Charles Drew University of Medicine and Science; Other
Eligibility: 18 Years to 49 Years
Enrollment: 12 participants
Healthy volunteers: Accepts healthy volunteers
Timeline: 2002 – 2010
U.S. locations: 1
States / cities: Los Angeles, California

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

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

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

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

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

Conditions: Prostate Cancer
Interventions: Sildenafil; Drug
Lead sponsor: Johns Hopkins University; Other
Eligibility: 18 Years to 64 Years · Male only
Enrollment: 100 participants
Healthy volunteers: Healthy volunteers not accepted
Timeline: 2006 – 2008
U.S. locations: 1
States / cities: Baltimore, Maryland

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

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

Search by objective public record fields.

Can Hyperbaric Oxygen Improve Erectile Function Following Surgery for Prostate Cancer

Testosterone for Penile Rehabilitation After Radical Prostatectomy

Sildenafil to Increase Exercise Capacity in Individuals With Idiopathic Pulmonary Fibrosis and Pulmonary Hypertension

Nebivolol in the Supine Hypertension of Autonomic Failure

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

Does Sildenafil Increase Exercise Performance in Air Pollution?

Sorafenib, Valproic Acid, and Sildenafil in Treating Patients With Recurrent High-Grade Glioma

A Study Of The Safety and Efficacy Of Viagra In Men With Erectile Dysfunction Who Do Not Self Identify.

Treatment of Supine Hypertension in Autonomic Failure

An Open-Label, Extension Study Evaluating the Safety, Toleration, and Efficacy of Sildenafil in Women With Sexual Arousal Disorder

A Multicenter, Randomized, Parallel Group, Double-Blind, Placebo Controlled, Flexible Dose Escalation Study To Evaluate Sexual And Relationship Satisfaction In The Female Partner Of Men With Erectile Dysfunction Treated With Sildenafil Citrate

Use of Sildenafil (Viagra) to Alter Fatigue, Functional Status and Impaired Cerebral Blood Flow in Patients With CFS

Growth Hormone or Sildenafil as Therapies for Fatigue in Mild- Traumatic-brain-injury (MTBI)

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

The Effect of Sildenafil and Tadalafil on Skeletal Muscle and Perceptual Fatigue

Sildenafil for Treatment of Priapism in Men With Sickle Cell Anemia

Blood Flow and Vascular Function in Cystic Fibrosis

Effect of Nightly Versus Prn Sildenafil on Early Return of Erectile Function Following Laparoscopic Radical Prostatectomy

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

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