The purpose of the study is to compare the efficacy and safety of an investigational nasal spray compared with placebo nasal spray in the treatment of seasonal allergic rhinitis. Allergic rhinitis is an inflammatory disorder of the upper airway that occurs following allergen exposure. The focus of this study, seasonal allergic rhinitis (SAR), is one type of allergic rhinitis that is triggered by the pollen from trees, grasses, and weeds. Commonly referred to as "hay fever", it is characterized by sneezing, nasal congestion and pruritus, rhinorrhea, and pruritic, watery, red eyes.

Inclusion criteria:

• Informed consent.
• Outpatient.
• Females must use appropriate contraception.
• Diagnosis of seasonal allergic rhinitis.
• Adequate exposure to allergen.
• Able to comply with study procedures.
• Literate.

Exclusion criteria:

• Significant concomitant medical condition.
• Use of corticosteroids, allergy medications, or tobacco.
• Clinically significant abnormal ECG.
• Laboratory abnormality.
• Positive pregnancy test.
• Allergy to any component of the investigational product.

Patient-level data for this study will be made available through www.clinicalstudydatarequest.com following the timelines and process described on this site.