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A Multicenter, Double-Blind Study to Evaluate the Effect of Pretreatment With a Daily Dose of Sildenafil on the As-Needed Efficacy of Viagra in Men With Erectile Dysfunction and Type 2 Diabetes

This study has been completed.
Information provided by:
Pfizer Identifier:
First received: March 20, 2008
Last updated: NA
Last verified: March 2008
History: No changes posted
To determine the effect on erectile function in a population of type 2 diabetic men with erectile dysfunction who have undergone the following treatment regimen: pre-treatment with a daily dose of double-blind sildenafil versus placebo for 4 weeks (Phase I) followed by an as-needed, flexible-dose, open-label treatment phase with sildenafil for 12 weeks (Phase II). To assess safety and tolerability of this dosing regimen and to investigate its effects on endothelial function and subject's responses to the Self-Esteem And Relationship (SEAR) questionnaire.

Condition Intervention Phase
Erectile Dysfunction
Diabetes Mellitus, Type 2
Drug: sildenafil
Drug: placebo
Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Investigator)
Primary Purpose: Treatment
Official Title: A Multicenter, Double-Blind Study to Evaluate the Effect of Pretreatment With a Daily Dose of Viagra® (Sildenafil Citrate) on the PRN Efficacy of Viagra in Men With Erectile Dysfunction and Type 2 Diabetes

Resource links provided by NLM:

Further study details as provided by Pfizer:

Primary Outcome Measures:
  • The IIEF Erectile Function (EF) Domain score [ Time Frame: Week 4 ]

Secondary Outcome Measures:
  • Intercourse success rate based on Event Logs [ Time Frame: continuous ]
  • Ability to obtain an erection hard enough to attempt sexual intercourse post dose of sildenafil [ Time Frame: continuous ]
  • Responses to the Self-Esteem And Relationship (SEAR) Questionnaire (including individual domain scores for the Sexual Activity, Self-Esteem And Relationship domains) [ Time Frame: Week 16 ]
  • Responses to International Index of Erectile Function (IIEF) and secondary IIEF Domain scores (Orgasm; Desire; Intercourse Satisfaction; Overall Satisfaction) [ Time Frame: Week 16 ]
  • Reponses to the Global Efficacy Assessment Questions [ Time Frame: Week 16 ]
  • Flow mediated brachial artery dilation (FMD) as an index of generalized endothelial function [ Time Frame: Week 4, 6, and 16 ]

Estimated Enrollment: 300
Study Start Date: December 2002
Study Completion Date: January 2004
Arms Assigned Interventions
Active Comparator: Arm 1 Drug: sildenafil
In the double-blind phase, patients received sildenafil 50 mg once daily during Week 1 (7 doses), followed by a daily dose of sildenafil 100 mg during the next 3 weeks.
Placebo Comparator: Arm 2 Drug: placebo
In the double-blind phase, patients received placebo once daily during Week 1 (7 doses), followed by a daily dose of placebo during the next 3 weeks.
Open-Label Arm Drug: sildenafil
Eligible subjects then entered an open-label phase during which all subjects received sildenafil 50 mg as needed for sexual activity for the next 2 weeks, which could be titrated to either 25 mg or 100 mg based on the investigator's assessment of efficacy and tolerability, for 10 weeks (12 weeks total).


Ages Eligible for Study:   35 Years to 70 Years   (Adult, Senior)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No

Inclusion Criteria:

Patients had a documented clinical diagnosis of erectile dysfunction, a sexual partner for the duration of the study, and have a HbAlc of less than or equal to 10 at screening. Type 2 diabetic patients currently on insulin or on combination therapy with an oral hypoglycemic agent were not excluded.

Exclusion Criteria:

Excluded were subjects who had taken more than 6 doses of any PDE5 inhibitor and/or had taken their last dose less than 4 weeks prior to the screening visit; subjects with resting sitting and/or standing hypotension (BP < 90/50mmHg) or hypertension (BP > 170/110mmHg); and subjects with significant cardiovascular disease, including cardiac failure, myocardial infarction, unstable angina, stroke or transient ischemic attack (TIA), symptomatic or clinically significant cardiac arrhythmias including atrial fibrillation in the last 3 months.

  Contacts and Locations
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Please refer to this study by its identifier: NCT00645268

  Show 29 Study Locations
Sponsors and Collaborators
Study Director: Pfizer Call Center Pfizer
  More Information

Additional Information:
Responsible Party: Director, Clinical Trial Disclosure Group, Pfizer, Inc. Identifier: NCT00645268     History of Changes
Other Study ID Numbers: A1481146
Study First Received: March 20, 2008
Last Updated: March 20, 2008

Additional relevant MeSH terms:
Diabetes Mellitus
Diabetes Mellitus, Type 2
Erectile Dysfunction
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases
Sexual Dysfunction, Physiological
Genital Diseases, Male
Sexual Dysfunctions, Psychological
Mental Disorders
Sildenafil Citrate
Vasodilator Agents
Phosphodiesterase 5 Inhibitors
Phosphodiesterase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Urological Agents processed this record on April 28, 2017