Evaluation of the Index of Sexual Life Questionnaire

An Open Label, Multicenter Study to Measure Treatment Responsiveness of Quality of Sexual Life Questionnaire in the Female Partner of Men With Erectile Dysfunction Treated With Viagra (Sildenafil Citrate)

The purpose of the study is to assess the sensibility of the ISL questionnaire.

Inclusion Criteria:

ED patient must:

• Be male, 18 years of age with no upper age limit;
• Have a documented clinical diagnosis of erectile dysfunction confirmed by an Erectile Function (IIEF) score 25. Erectile dysfunction is defined as "the inability to achieve and/or maintain an erection of the penis sufficient to permit satisfactory sexual performance" (Impotence-NIH Consensus Conference, JAMA 1993, 270: 83-90);
• Have a stable female partner for at least 6 months prior to screening.

Exclusion Criteria:

• Have a known hypersensitivity to sildenafil or any component of the study medication; medical history of treatment-related intolerable side effects to sildenafil
• Be currently prescribed, taking and/or likely to be treated with nitrates or nitric oxide donors in any form on either a regular or intermittent basis.