Concomitant Medications At the time of enrollment, most subjects will be expected to already be using topical nasal steroid medication (ie., fluticasone or Flonase®). Subjects currently using a topical nasal steroid spray will be asked to continue this medication. Topical nasal steroid sprays are indicated therapy for CRS and not considered experimental. Subjects not currently using a topical steroid spray will be asked to not initiate therapy during the duration of the study, unless there is a medical reason to use.