Medical Information Only. Always consult your healthcare provider before enrolling in any clinical trial.
NCT00655590 · ClinicalTrials.gov registry record · Phase 4
Assess the Effect of Daily Treatment of Vardenafil 20mg or Sildenafil 100mg and Placebo on Sperm Function
A Phase 4 study, sponsored by Bayer.
- Completed
- Registry status
- Phase 4
- Development phase
- 200
- Enrollment target
NCT00655590: Completed Phase 4 study, sponsored by Bayer.
NCT00655590 is a Phase 4 study that has completed, run by Bayer. The registered enrollment target is 200 participants, below the 518-participant average among 9,235 other Phase 4 trials with a reported enrollment target (61% lower). According to ClinicalTrials.gov, the official US trial registry.
The verdict
NCT00655590, a Phase 4 study, has completed, sponsored by Bayer.
- COMPLETED
- Registry status
- Phase 4
- Development phase
- 200 participants
- Enrollment target
Study Summary
Assess the effect of daily treatment of vardenafil 20mg or sildenafil 100mg and placebo on sperm function
Interventions
- DRUG Placebo
- DRUG Sildenafil
- DRUG Levitra (Vardenafil, BAY38-9456)
Trial Details
| Field | Value |
|---|---|
| Enrollment Target | 200 participants |
| Start Date | 2005-01 |
| Est. Completion | 2006-06 |
| Phase | Phase 4 |
What the finished NCT00655590 record still lists
NCT00655590 is an interventional study that assigns participants to a tested intervention. The registered 200 participants enrollment target is mid-sized for trials with a published cap, below the 518-participant average among 9,235 other Phase 4 trials with a reported enrollment target (61% lower).
The record links to 0 conditions, and to 3 interventions - of which Placebo is the first listed.
NCT00655590 does not publish any study locations in the registry export this page uses.
Frequently Asked Questions
What is clinical trial NCT00655590 about?
NCT00655590 is a clinical study titled "Assess the Effect of Daily Treatment of Vardenafil 20mg or Sildenafil 100mg and Placebo on Sperm Function". Assess the effect of daily treatment of vardenafil 20mg or sildenafil 100mg and placebo on sperm function
What is the current status of trial NCT00655590?
This trial is currently completed. It is a Phase 4 study. The enrollment target is 200 participants. The study started on 2005-01. Estimated completion is 2006-06.
What interventions are being tested in trial NCT00655590?
The interventions under investigation include: Placebo (DRUG), Sildenafil (DRUG), Levitra (Vardenafil, BAY38-9456) (DRUG).
Who is sponsoring clinical trial NCT00655590?
This trial is sponsored by Bayer, which has 591 total clinical trials registered on ClinicalTrials.gov.
Learn More About Clinical Trials
How this trial's enrollment target compares
Where NCT00655590's enrollment target sits among peer trials
200 407th of 2000 higher than 1,556 of 2,000 other Phase 4 trials
participants (enrollment target), bucketed by value
Each bar is a band; taller bars hold more other Phase 4 trials. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source ClinicalTrials.gov registry export · 2026-08-08
Nationwide trials with similar profiles
Cross-condition peers matched on enrollment target and registry start date, not the same-condition list above.
Similar enrollment target
- NCT00107289 · 200 participants · Phase 2
Iodine I 131 Metaiodobenzylguanidine in Treating Patients With Recurrent, Progressive, or Refractory Neuroblastoma or Malignant Pheochromocytoma or Paraganglioma
- NCT00109174 · 200 participants · NA
MRS Measurement of Glutamate and GABA Metabolism in Brain
- NCT00177268 · 200 participants
Blood, Urine, and Tissue Collection for Cutaneous Lymphoma, Eczema, and Atopic Dermatitis Research
- NCT00493688 · 200 participants
A Study to Determine Whether Perioperative Energy Dynamics Correlates With Postoperative Outcomes
Similar registry start date
- NCT05988463 · started 2027-01-01 · Phase 1
Dose-Escalation Study of Artesunate Patients With IPF
- NCT07219706 · started 2026-12-10 · NA
Dietary Fiber and Time Restricted Eating
- NCT02831335 · started 2026-12-01
Technical Development of Multi-Parametric Renocerebral MRI
- NCT05962346 · started 2026-12 · NA
Fetal Endoscopic Tracheal Occlusion for Congenital Diaphragmatic Hernia