Studying the Preference of Tadalafil to Sildenafil in Men With Problems Getting an Erection Across Nations

Switching From Sildenafil Citrate to Tadalafil in Treatment of Erectile Dysfunction: Multinational Assessment of Treatment Preference

Study to determine if men from around the world prefer sildenafil to tadalafil.

Inclusion Criteria:

• Must be of legal age according to your country.
• Must have had a history of erectile dysfunction for at least 3 months.
• Must currently and have been using sildenafil for the last six weeks.
• Agree to not use any other ED treatment during the study.
• Anticipate the same female sexual partner for the study.

Exclusion Criteria:

• History of other primary sexual disorder
• Treatment with nitrates
• Have a penile implant or clinically significant penile deformity
• History of certain heart problems
• Do not meet certain lab value reference ranges