• Physician-diagnosed perennial allergic rhinitis (PAR).

• Has a positive skin prick test (SPT) with indoor allergens and/or positive serum antigen-specific immunoglobulin E (IgE) for indoor allergens ≥0.70 kU/L, utilizing a validated assay (central laboratory).

• The participant must have clinical symptoms at study entry associated with positive perennial allergen as tested by the SPT or a positive serum antigen-specific IgE test.

• A participant who has a known history of dermatographism or identified during the SPT may participate in this study with a positive serum antigen-specific IgE test.

• Participants who have concomitant asthma must be stable in the 3 months prior to screening using permitted regular asthma treatment.