Bioavailability of 3 Sildenafil Oral Disintegrating Tablet Formulations Compared to the Standard Oral Tablet

Inclusion Criteria: * Healthy subjects * Weight: BMI from 17.5 to 30.5 Exclusion Criteria: * Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurologic, or allergic disease (including drug allergies, but excluding untreated, asymptomatic, seasonal allergies at time of dosing). * A positive urine drug screen.