Efficacy and Safety of Levocetirizine 8 Weeks Prior and After the Onset of the Grass Pollen Season in Subjects With SAR

Inclusion Criteria: * male or female subjects ≥ 12 years * 2 year history of seasonal allergic rhinitis * documented hypersensitivity to local seasonal allergens (grass pollen) * documented pollen-induced asthma * without acute ongoing exacerbation of asthma or allergic rhinitis * no continuous ongoing treatment for rhinitis or asthma Exclusion Criteria: * non-allergic rhinitis and anatomic abnormalities disturbing the analysis of nasal capacity * symptomatic rhinitis or asthma due to tree pollens * currently treated by specific grass pollen immunotherapy * suffering from non-allergic asthma * chronic use of inhaled steroids and/or long acting β2 agonists; and/or corticosteroid dependent asthma * atopic dermatitis or urticaria requiring an antihistamine treatment or the administration of oral or topical corticosteroids * contraindication for salbutamol use