Overview Studying the Preference of Tadalafil to Sildenafil in Men With Problems Getting an Erection Across Nations Status: Completed Trial end date: 2004-05-01 Target enrollment: Participant gender: Summary Study to determine if men from around the world prefer sildenafil to tadalafil. Phase: Phase 3 Details Lead Sponsor: Eli Lilly and CompanyCollaborator: ICOS CorporationTreatments: Sildenafil CitrateTadalafil