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Sponsors and Collaborators: |
Boston University Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) |
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Information provided by: | Boston University |
ClinicalTrials.gov Identifier: | NCT00512707 |
The purpose of this placebo-controlled study is to determine if testosterone replacement therapy, administered by transdermal gel, can improve the response to sildenafil (Viagra R) treatment in men who have erectile dysfunction (ED) and low testosterone levels.
Condition | Intervention | Phase |
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Erectile Dysfunction Testosterone Deficiency Diabetes |
Drug: Sildenafil citrate (open label) Drug: Testosterone gel 1% (active or placebo) Drug: Topical testosterone gel 1% |
Phase IV |
Study Type: | Interventional |
Study Design: | Treatment, Randomized, Double Blind (Subject, Investigator), Placebo Control, Parallel Assignment, Safety/Efficacy Study |
Official Title: | Androgen Modulation of Response to Selective Phosphodiesterase Inhibitors in Erectile Dysfunction |
Estimated Enrollment: | 138 |
Study Start Date: | November 2006 |
Estimated Study Completion Date: | December 2009 |
Estimated Primary Completion Date: | October 2009 (Final data collection date for primary outcome measure) |
Arms | Assigned Interventions |
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1: Experimental
Active Testosterone Gel
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Drug: Sildenafil citrate (open label)
On demand use of sildenafil citrate (3 tablets per week). Starting dose of 50 mg. Titrated to 100 mg or 25 mg depending on efficacy and tolerability. Begins as open label run in period for 3 - 6 weeks, and continues during the placebo-controlled testosterone gel intervention for 16 weeks.
Drug: Testosterone gel 1% (active or placebo)
Testosterone Gel 1%: Starting active dose 10 g/day. Increased to 15 g/day or decreased to 5 g/day in order to attain morning total testosterone level between 500 - 1000 ng/dL. Blinding achieved by combining a total of 3 tubes of active or placebo gel, applied to upper arms and shoulders each day.
Drug: Topical testosterone gel 1%
Testosterone Gel: Starting dose 10 g/day. Increased to 15 g/day or decreased to 5 g/day in order to attain morning total testosterone level between 500 - 1000 ng/dL. Blinded achieved by combining a total of 3 tubes of active or placebo gel.
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2: Placebo Comparator
Placebo Gel
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Drug: Sildenafil citrate (open label)
On demand use of sildenafil citrate (3 tablets per week). Starting dose of 50 mg. Titrated to 100 mg or 25 mg depending on efficacy and tolerability. Begins as open label run in period for 3 - 6 weeks, and continues during the placebo-controlled testosterone gel intervention for 16 weeks.
Drug: Testosterone gel 1% (active or placebo)
Testosterone Gel 1%: Starting active dose 10 g/day. Increased to 15 g/day or decreased to 5 g/day in order to attain morning total testosterone level between 500 - 1000 ng/dL. Blinding achieved by combining a total of 3 tubes of active or placebo gel, applied to upper arms and shoulders each day.
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This is a double-blind, placebo-controlled, parallel-group, randomized clinical trial in men, 40-70 years of age, who present with mild to moderate erectile dysfunction and have androgen deficiency defined as serum total testosterone level below 300 ng/dL, measured by liquid chromatography tandem mass spectrometry, LC-MS/MS (15) and/or free testosterone level (measured by equilibrium dialysis) below 50 pg/ml. Sexual function assessments will include validated erectile function questionnaires (IIEF), sexual activity diaries, sexual desire, partner interaction and intimacy, affects balance scale, mood, ED-related quality of life, and penile rigidity in response to a visual erotic stimulus. The initial assessment will be made prior to treatment with sildenafil citrate, i.e., in subjects who are naïve to or withdrawn from PDE5 inhibitors and/or testosterone. Participants will then be allotted three sildenafil citrate tablets per week (12 pills per month), but will not use more than one tablet within any 24-hour period. During the Sildenafil-Dose Optimization period, subjects naïve to sildenafil citrate will start with a 50 mg dose. Those who have used sildenafil citrate in the past will take the same dose that was found to be efficacious for them. After three weeks, the dose of sildenafil citrate will be increased to 100-mg in non-responders. For those who cannot tolerate the 50-mg dose, a dose of 25 mg will be given. After three weeks on the optimized dose of sildenafil citrate, subjects will undergo a second evaluation of sexual function. They will then be randomly assigned to receive this optimized dose of sildenafil citrate with either placebo gel (15 g per day) or active testosterone gel (10 g active gel + 5 g placebo gel per day). The daily dose of active testosterone gel was selected to increase average serum into the upper-half of the normal range for healthy, young men (e.g., 500-1000 ng/dL). In order to assure that serum testosterone levels are in the target range (500-1000 ng/dL), testosterone dose will be adjusted by an unblinded individual two to three weeks after initiation of testosterone/placebo treatment, based on the measurement of serum testosterone levels. If the average testosterone level is less than 500 ng/dL, the daily dose will be increased to 15g of active gel. If the average testosterone is greater than 1,000 ng/dL, the daily dose will be decreased to 5 g of active gel (and 10 g of placebo gel). This dose adjustment will take effect at week 4 (day 28) of treatment. Subjects will be treated for an additional 12-weeks with sildenafil citrate and the optimized dose of testosterone gel or placebo gel. Sexual function will be evaluated at the end of this treatment period.
Ages Eligible for Study: | 40 Years to 70 Years |
Genders Eligible for Study: | Male |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
Exclusion Criteria:
Contact: Amanda M Paley, BA | 617-638-8616 | amanda.paley@bmc.org |
Contact: Norman A Mazer, MD, PhD | 617-638-8292 | norm.mazer@bmc.org |
United States, Massachusetts | |
Boston University Medical Center | Recruiting |
Boston, Massachusetts, United States, 02118 | |
Principal Investigator: Shalender Bhasin, MD | |
Sub-Investigator: Norman A Mazer, MD, PhD | |
Sub-Investigator: Beth Kaplan, MD |
Principal Investigator: | Shalender Bhasin, MD | Boston University |
Study Director: | Norman A Mazer, MD, PhD | Boston University |
Responsible Party: | Boston University Medical Center ( Dr. Shalender Bhasin ) |
Study ID Numbers: | R01-HD047722-01A1 |
Study First Received: | August 7, 2007 |
Last Updated: | June 23, 2008 |
ClinicalTrials.gov Identifier: | NCT00512707 |
Health Authority: | United States: Institutional Review Board |
testosterone erectile dysfunction sildenafil |
Sexual Dysfunctions, Psychological Testosterone Sexual Dysfunction, Physiological Mental Disorders Citric Acid Diabetes Mellitus |
Sildenafil Methyltestosterone Genital Diseases, Male Erectile Dysfunction Testosterone 17 beta-cypionate |
Vasodilator Agents Molecular Mechanisms of Pharmacological Action Antineoplastic Agents, Hormonal Antineoplastic Agents Physiological Effects of Drugs Hormones, Hormone Substitutes, and Hormone Antagonists Enzyme Inhibitors Cardiovascular Agents |
Sexual and Gender Disorders Hormones Pharmacologic Actions Anabolic Agents Phosphodiesterase Inhibitors Therapeutic Uses Androgens |