Study Evaluating the Efficacy and Safety of Intranasal Administration of 100, 200, and 400 μg of Fluticasone Propionate Twice a Day (BID) Using a Novel Bi Directional Device in Subjects With Bilateral Nasal Polyposis Followed by an 8-Week Open-Label Extension Phase to Assess Safety

Inclusion Criteria: * Men or women aged 18 years and older * Women must * be practicing an effective method of birth control (eg,prescription oral contraceptives, contraceptive injections, contraceptive patch, intrauterine device, double-barrier method \[eg, condoms, diaphragm, or cervical cap with spermicidal foam, cream, or gel\], or male partner sterilization) before entry and throughout the study, or * be surgically sterile (have had a hysterectomy or bilateral oophorectomy, or tubal ligation at least 1 year before screening) or otherwise be incapable of pregnancy, or * be postmenopausal (spontaneous amenorrhea for at least 1 year). * Women of child-bearing potential must have a negative serum beta-human chorionic gonadotropin (B-hCG) or urine pregnancy test (depending on local regulations) at the screening visit * Must have bilateral nasal polyposis with a grade of 1 to 3 in each of the nasal cavities as determined by the Lildholdt scale score measured by nasoendoscopy at both screening and baseline visits * Must have at least moderate symptoms of nasal congestion/obstruction as reported by the subject for the 7 day period preceding the screening visit * At the baseline visit (Day 1), must have a morning score of at least 2 (moderate) on nasal congestion/obstruction recorded on the subject diary for at least 5 of the last 7 days of the 7 to up to 14 day run-in period * Must demonstrate an ability to correctly complete the daily diary during the run-in period to b…