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A Study of Visual Effects of Erectile Dysfunction Medications Dosed Daily for Six Months

This study has been completed.
ICOS Corporation
Information provided by:
Eli Lilly and Company Identifier:
First received: May 31, 2006
Last updated: October 23, 2007
Last verified: October 2007
This is a multicenter, randomized, double-blind, placebo-controlled study to evaluate the effects on vision of six months of daily dosing of 5 mg tadalafil or 50 mg sildenafil compared with placebo.

Condition Intervention Phase
Erectile Dysfunction Drug: tadalafil Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double
Primary Purpose: Treatment
Official Title: A Randomized, Double-Blind, Parallel-Design, Placebo-Controlled Study to Evaluate the Effects of 5 mg Tadalafil (IC351, LY450190) and 50 mg Sildenafil Administered Once Daily for 6 Months on Visual Function in Healthy Subjects or Subjects With Mild Erectile Dysfunction

Resource links provided by NLM:

Further study details as provided by Eli Lilly and Company:

Primary Outcome Measures:
  • Change in dark-adapted bright flash b-wave amplitude on electroretinography (ERG) testing at baseline, 3 & 6 months on drug, and 4-6 weeks after discontinuation of drug.

Secondary Outcome Measures:
  • Five other ERG waveform components; intraocular pressure; visual acuity; peripheral vision; color discrimination; and inspection of anterior chamber, lens, and retinal anatomy.

Estimated Enrollment: 198
Study Start Date: June 2005
Study Completion Date: August 2006
Intervention Details:
    Drug: tadalafil
    Other Names:
    • LY450190
    • Cialis
    • IC351

Ages Eligible for Study:   30 Years to 65 Years   (Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy male subjects or males with mild erectile dysfunction (ED).
  • Between the ages of 30 and 65 years, inclusive.

Exclusion Criteria:

  • Phosphodiesterase type 5 (PDE5) inhibitor therapy (tadalafil, sildenafil, or vardenafil) within 6 weeks of the start of the study.
  • Diagnosis of diabetes mellitus.
  • Any chronic illness or medication that is a risk factor for eye disease or any medication that causes retinal toxicity or affects visual function.
  • Certain chronic medical conditions including unstable angina pectoris, severe renal [kidney] insufficiency, clinically significant hepatobiliary [liver, bile duct] disease, cancer, and AIDS/HIV.
  • A history of clinically significant chronic ophthalmologic disease or any significant visual abnormality identified at the start of the study.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00333281

United States, Indiana
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, United States
Sponsors and Collaborators
Eli Lilly and Company
ICOS Corporation
Study Director: Call 1-877-CTLILLY (1-877-285-4559) or 1-317-615-4559 Mon - Fri 9 AM - 5 PM Eastern time (UTC/GMT - 5 hours, EST) Eli Lilly and Company
  More Information

Additional Information:
Publications automatically indexed to this study by Identifier (NCT Number): Identifier: NCT00333281     History of Changes
Other Study ID Numbers: 9520
Study First Received: May 31, 2006
Last Updated: October 23, 2007

Keywords provided by Eli Lilly and Company:
Healthy Volunteers

Additional relevant MeSH terms:
Erectile Dysfunction
Sexual Dysfunction, Physiological
Genital Diseases, Male
Sexual Dysfunctions, Psychological
Mental Disorders
Vasodilator Agents
Phosphodiesterase 5 Inhibitors
Phosphodiesterase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Urological Agents processed this record on September 21, 2017