Overview Safety Study of Olopatadine Nasal Spray Status: Completed Trial end date: 2008-01-01 Target enrollment: Participant gender: Summary The purpose of this study is to determine whether olopatadine nasal spray is safe and effective when used for up to one year by patients with perennial allergic rhinitis. Phase: Phase 3 Details Lead Sponsor: Alcon ResearchTreatments: Olopatadine Hydrochloride