Comparison of Desloratadine Associated With Prednisolone (Tablet)Versus Dexchlorpheniramine Associated With Betamethasone (Tablet) for Adult Persistent Allergic Rhinitis Treatment

Inclusion Criteria: * Signed Consent of the patient; * Clinical diagnosis of moderate - severe persistent allergic rhinitis according to ARIA classification(Allergic Rhinitis and Its Impact on Asthma); * Adults aged ≥ 18 years old; * Evidence of sensitization to aeroallergens in examination (immediate skin tests or serum specific IgE) in the 12 months prior to inclusion. Exclusion Criteria: * Decongestants dependent patients or patients receiving allergen specific immunotherapy; * Patients who were in use of oral antihistamines or decongestants in the past 15 days; * Patients who were treated with systemic corticosteroids in the last month; * Patients on treatment with monoamine oxidase inhibitors (MAOIs); * Patients with history of hypersensitivity to any of the formula compounds; * Patients with any clinically significant disease that in the investigator opinion can not participate in the study * Patients who have uncontrolled asthma, chronic sinusitis, drug related rhinitis and nasal anatomic abnormalities. * Participation in clinical trial in 30 days prior to study entry;