Assessment of Intranasal Steroids in Allergic Rhinitis When Used Alone or in Combination With an Oral Antihistamine (Study P03270)

Inclusion Criteria: * Subjects must demonstrate their willingness to participate in the study and comply with its procedures by signing a written informed consent form * Subjects must be between 18-65 years of age, of either sex and any race * Subjects must be diagnosed by the physician to have moderate to severe allergic rhinitis according to ARIA guidelines. * Subjects must be mometasone furoate naïve. Exclusion Criteria: * Significant comorbid medical condition. * Respiratory tract infection. * Any contraindications according to mometasone furoate product monograph. * Patients who have received antihistamine treatment within the last 5 days. * Patients who have received corticosteroid treatment within the last 30 days. * Patients who are likely to require the administration of systemic steroids during the course of this program. * Any condition which in the doctor's opinion could interfere with the patient completion of this program. * Pregnant or lactating patients. * Patients with local infections involving the nasal mucosa. * Patients with structural abnormalities or who have undergone nasal surgery or trauma in the past 6 months. * Patients with hypersensitivity to mometasone furoate or are allergic to corticosteroids. * Patients who are prone to nose bleeding.