| Recruiting | Aerobic Exercise Addition to Cognitive Behavioural Treatment in Impotence Metabolic-syndrome Drinkers NCT07277673 | Cairo University | N/A |
| Completed | Pentoxifylline, Atorvastatin, and Vitamin E in Treating Patients With Erectile Dysfunction After Radiation The NCT03830164 | M.D. Anderson Cancer Center | Phase 2 |
| Completed | PROPPER Prospective Registry of Outcomes With Penile Prosthesis NCT01383018 | Boston Scientific Corporation | — |
| Unknown | Can Hyperbaric Oxygen Improve Erectile Function Following Surgery for Prostate Cancer NCT00906269 | Hartford Hospital | Phase 4 |
| Unknown | Safety and Clinical Effectiveness of 2 Lower Dose Combined PDE5i's vs. Single Maximal Dose PDE5i NCT00498680 | Rambam Health Care Campus | Phase 4 |
| Completed | Tadalafil Taken Daily Compared to Placebo on Improvement of Getting and Maintaining an Erection and Sexual Qua NCT00422734 | Eli Lilly and Company | Phase 3 |
| Completed | The Management of Erectile Dysfunction With Placebo Only NCT00882934 | Rio de Janeiro State University | N/A |
| Withdrawn | Improvement of Erectile Dysfunction by Fluvastatin in Patients With Cardiovascular Risk Factors NCT00382161 | University Hospital, Saarland | Phase 3 |
| Completed | A Study Of The Safety and Efficacy Of Viagra In Men With Erectile Dysfunction Who Do Not Self Identify. NCT00343200 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |
| Completed | Effect of Vardenafil on Blood Pressure in Patients With Erectile Dysfunction Who Received Concomitant Doxazosi NCT00517179 | Hospital Authority, Hong Kong | N/A |
| Completed | A Randomized Double Blind, Placebo Controlled Balanced 4-Way Crossover Study To Assess The Efficacy Of Single NCT00273416 | Pfizer | Phase 2 |
| Completed | Study to Evaluate Viagra's Ability to Provide a Better Sexual Experience Through Quality Erections and Satisfa NCT00245258 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |
| Completed | Impact Of Viagra On Sexual Satisfaction Of Men With Mild Erectile Dysfunction Who Are Sexually Dissatisfied NCT00301262 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |
| Completed | Assessment Of Sildenafil On Erectile Function And Intercourse Satisfaction And To Validate A New Subject Quest NCT00147628 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |
| Unknown | Effect of Sildenafil on Endothelial Function NCT00297544 | Rambam Health Care Campus | N/A |
| Completed | Titration Study to Evaluate Efficacy and Satisfaction of Viagra in Men With Erectile Function. NCT00249730 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |
| Completed | Evaluation of the Index of Sexual Life Questionnaire NCT00245596 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |
| Completed | Study Of Men With Mild To Moderate Erectile Dysfunction To Evaluate The Efficacy Of Viagra 8 Hours Post-Dose NCT00143260 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |
| Completed | Mild To Moderate Erectile Dysfunction Study NCT00137072 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |
| Completed | To Yield Further Information On The Efficacy And Safety Of Viagra Among Subjects With Arterial Hypertension . NCT00150358 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |
| Completed | Assessment Of Duration Of Action, Safety & Toleration Of UK369,003 and Cialis In Patients With Erectile Dysfun NCT00174486 | Pfizer | Phase 2 |
| Completed | Assessment of Onset, Safety & Toleration of UK-369,003 in Male Erectile Dysfunction NCT00141349 | Pfizer | Phase 2 |
| Completed | QEQ Treatment Responsiveness Evaluation Study NCT00151463 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |
| Completed | Study the Safety and Effectiveness of Tadalafil in Men With Diabetes Who Have Problems Getting and Keeping an NCT00547183 | Eli Lilly and Company | Phase 3 |
| Completed | Effect of Tadalafil on the Quality of Life and Sexual Life in Erectile Dysfunction NCT00422578 | Eli Lilly and Company | Phase 4 |
| Completed | Use of Sildenafil (Viagra) in Diabetic Men With Erectile Dysfunction: the Impact on Blood Vessels NCT00199563 | London Health Sciences Centre Research Institute OR Lawson Research Institute of St. Joseph's | Phase 4 |
| Completed | Study to Determine a Preference Between Sildenafil or Tadalafil Treatment for Problems Getting an Erection NCT00547352 | Eli Lilly and Company | Phase 4 |
| Completed | Effectiveness and Safety of Viagra in Men With ED and LUTS Due to Benign Prostatic Hyperplasia (BPH) NCT00143221 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |
| Completed | Efficacy Study Measuring The Impact Of Treatment With Viagra On The Depressive Symptoms Of Men With Erectile D NCT00159809 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |
| Completed | Study the Safety and Effectiveness of Tadalafil in Men With Problems Getting or Maintaining an Erection When T NCT00547495 | Eli Lilly and Company | Phase 3 |
| Completed | Evaluate the Effects of GPI 1485 on Erectile Function Following Bilateral Nerve-Sparing Prostatectomy NCT00090376 | Eisai Inc. | Phase 2 |
| Completed | Study For Which Treatment, Tadalafil or Sildenafil, is Preferred For Problems Getting or Maintaining an Erecti NCT00547092 | Eli Lilly and Company | Phase 4 |
| Completed | Effect Of A Treatment Optimization Program To Improve Satisfaction With Viagra NCT00159848 | Pfizer | Phase 4 |
| Completed | To Determine Effect and Safety of Tadalafil Taken by Men of Different Races and With Different Diseases When N NCT00547417 | Eli Lilly and Company | Phase 3 |
| Completed | Determine Safety and Effectiveness of Tadalafil in Asian Men When Taken as Needed for Getting and Keeping an E NCT00547573 | Eli Lilly and Company | Phase 3 |
| Completed | Determine If the Stress That Comes With Not Developing an Erection Affects Tadalafil Effects NCT00547599 | Eli Lilly and Company | Phase 4 |
| Completed | Studying the Preference of Tadalafil to Sildenafil in Men With Problems Getting an Erection Across Nations NCT00547287 | Eli Lilly and Company | Phase 3 |
| Completed | To Determine How Different Doses of Tadalafil Work on Getting and Keeping an Erection 26 or 36 Hours After Tak NCT00547508 | Eli Lilly and Company | Phase 3 |
| Completed | A Study Evaluating the Efficacy and Safety of Sildenafil in Men With Traumatic Spinal Cord Injury and Erectile NCT00654082 | Pfizer's Upjohn has merged with Mylan to form Viatris Inc. | Phase 4 |