Study the Safety and Effectiveness of Tadalafil in Men With Diabetes Who Have Problems Getting and Keeping an Erection

A Randomized, Double-Blind, Parallel-Design, Placebo-Controlled Study to Evaluate the Efficacy and Safety of Tadalafil (2.5 mg and 5 mg) Administered Once Daily to Men With Diabetes Mellitus and Erectile Dysfunction

Study to evaluate the safety and effectiveness of 2.5 mg and 5 mg tadalafil when taken by men with diabetes mellitus who have problems getting and maintaining an erection.

Inclusion Criteria:

• History of erectile dysfunction for at least 3 months.
• Currently have diabetes mellitus of at least 3 months duration.
• Agree to not use any other ED treatment during the study.
• Anticipate the same female sexual partner for the study.
• Must be willing to make the required number of sexual attempts.

Exclusion Criteria:

• History of other primary sexual disorder
• Treatment with nitrates or potent CYP3A4 inhibitors
• Have a penile implant or clinically significant penile deformity
• History of certain heart problems
• Have kidney or liver problems