Effect of Testosterone in Men With Erectile Dysfunction
Condition: Erectile Dysfunction; Testosterone Deficiency; Diabetes
MeSH terms: Erectile Dysfunction
Study type: Interventional
Phase: Phase 4

Summary: 
      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.
    

Detailed description: 
      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      withdrawn from PDE5 inhibitors and/or testosterone.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.
    

Intervention name(s): Sildenafil citrate (open label); Testosterone gel; Placebo gel
Intervention type(s): Drug; Drug; Other
Intervention description(s): 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.; 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.; 3 tubes of placebo gel equivalent to the amount of the testosterone gel will be applied during the placebo-controlled testosterone gel intervention for 16 weeks..
Other intervention name(s): Viagra (Pfizer Inc.); Testim (Auxilium Pharmaceuticals, Inc.)
Intervention MeSH terms: Sildenafil Citrate; Testosterone
Allocation: Randomized
Intervention model: Parallel Assignment
Masking: Double (Participant, Investigator)
Primary purpose: Treatment
Keywords: testosterone; erectile dysfunction; sildenafil