A Randomized Double Blind, Placebo Controlled Balanced 4-Way Crossover Study To Assess The Efficacy Of Single Oral Doses

A Randomized Double Blind, Placebo Controlled Balanced 4-Way Crossover Study To Assess The Efficacy Of Single Oral Doses Of PF-00592379 On Erectile Function, Using 100mg Sildenafil As A Positive Control

The primary aim of this study is to assess how effective PF-00592379 is in restoring penile erections in patients with erectile dysfunction. Patients will attend for 4 treatment visits where they will receive the following in random order; 2 separate doses of PF-00592379, sildenafil 100mg used as a positive control, or placebo (dummy medication). The effect on penile erections will be assessed in the clinic using penile plethysmography (RigiScan PlusTM technique).

Inclusion Criteria:

• Erectile dysfunction, previous good response to an oral treatment for erectile dysfunction.

Exclusion Criteria:

• Patients with high blood pressure or certain heart conditions (e.g. angina, heart failure), regardless of whether treated or not.
• Patients on nitrates or alpha-blocker medications.