A Study in Erectile Dysfunction

ClinicalTrials.gov ID: NCT00833638

Open the official record

This page only displays public information reproduced from the official ClinicalTrials.gov record NCT00833638. It adds no medical advice, opinions, or eligibility judgments. The official record remains the source of truth for eligibility criteria, enrollment, and contact information.

View official ClinicalTrials.gov record → Back to search

ClinicalTrials.gov public records Last synced Nov 14, 2026, 8:31 PM EST

All trial information on this site comes from the official ClinicalTrials.gov public API (clinicaltrials.gov/api/v2), run by the U.S. National Library of Medicine. We only display that public information; we do not add opinions, endorsements, or any other intent. Always review the official ClinicalTrials.gov record for the latest information.

Official title

Tadalafil 2.5 mg and 5 mg Once a Day Compared to Placebo in Day of Onset of Efficacy

Brief summary

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

The purpose of this study is to determine the day of onset of efficacy of tadalafil dosed once-a-day.

Study identification

NCT ID: NCT00833638
Recruitment status: Completed
Study type: Interventional
Phase: Phase 4
Lead sponsor: Eli Lilly and Company; Industry
Enrollment: 372 participants

Conditions and interventions

Conditions

Erectile Dysfunction

Interventions

Placebo Drug
Tadalafil Drug

Drug

Eligibility (public fields only)

Age range: 18 Years and older
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: Feb 2009 (Type not available)
Primary completion: Jun 2009 (Actual)
Completion: Jun 2009 (Actual)
Last update posted: Aug 24, 2010

2009

United States locations

U.S. sites: 1
U.S. states: 1
U.S. cities: 1

Facility	City	State	ZIP	Site status
For additional information regarding investigative sites for this trial, contact 1-877-CTLILLY (1-877-285-4559, 1-317-615-4559) Mon - Fri from 9 AM to 5 PM Eastern Time (UTC/GMT - 5 hours, EST), or speak with your personal physician.	Indianapolis	Indiana	46285	—

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 NCT00833638, 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 Aug 24, 2010 · Synced Nov 14, 2026