Assess the Effect of Daily Treatment of Vardenafil 20mg or Sildenafil 100mg and Placebo on Sperm Function

ClinicalTrials.gov ID: NCT00655590

Public ClinicalTrials.gov record NCT00655590. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.

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ClinicalTrials.gov public records Last synced Oct 19, 2026, 11:29 PM EDT

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

Official title

A Randomized, Double-blind, Placebo Controlled, Parallel Arm, Multicenter Trial Assessing the Effect of Daily Treatment of Vardenafil 20 mg or Sildenafil 100 mg Compared to Placebo on Spermatogenesis

Brief summary

Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.

Assess the effect of daily treatment of vardenafil 20mg or sildenafil 100mg and placebo on sperm function

Study identification

NCT ID: NCT00655590
Recruitment status: Completed
Study type: Interventional
Phase: Phase 4
Lead sponsor: Bayer; Industry
Enrollment: 200 participants

Conditions and interventions

Conditions

Erectile Dysfunction

Interventions

Drug

Eligibility (public fields only)

Age range: 25 Years to 64 Years
Sex: Male
Healthy volunteers: Accepts healthy volunteers

This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.

Study timeline

Start date: Jan 2005 (Type not available)
Primary completion: Jun 2006 (Actual)
Completion: Jun 2006 (Actual)
Last update posted: Dec 30, 2014

2005 – 2006

United States locations

U.S. sites: 18
U.S. states: 10
U.S. cities: 18

Facility	City	State	ZIP	Site status
Not listed	Phoenix	Arizona	85023	—
Not listed	Tempe	Arizona	85282	—
Not listed	Beverly Hills	California	90212	—
Not listed	La Mesa	California	91942-3058	—
Not listed	Laguna Hills	California	92653	—
Not listed	San Diego	California	92128	—
Not listed	Torrance	California	90502-2004	—
Not listed	Van Nuys	California	91405	—
Not listed	Waterbury	Connecticut	06708	—
Not listed	Aventura	Florida	33180	—
Not listed	New Orleans	Louisiana	70112	—
Not listed	Ann Arbor	Michigan	48109-0330	—
Not listed	Minneapolis	Minnesota	55455	—
Not listed	Rochester	Minnesota	55905	—
Not listed	Great Neck	New York	11021	—
Not listed	New York	New York	10016-4576	—
Not listed	Cincinnati	Ohio	45212-2787	—
Not listed	San Antonio	Texas	78229	—

Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.

About this trial record page

What this page shows: Public field values for ClinicalTrials.gov record NCT00655590, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
What this page does not do: No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
Where the data comes from: Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
Last refresh: Last update posted Dec 30, 2014 · Synced Oct 19, 2026

Open the official record

The complete public registry record, listed eligibility criteria, and available contact information for NCT00655590 live on ClinicalTrials.gov.

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