To Evaluate the Efficacy and Safety of Levocetirizine Versus Loratadine for Treatment of Seasonal Allergic Rhinitis

Inclusion Criteria:

• Male or female, 18 to 60 years old, inclusive

• two-year history of allergic rhinitis due to tree, grass or weed pollen

• sufficient histamine-dependent symptoms of rhinitis during the selection week (T5SS ≥

Exclusion Criteria:

• An ear, nose or throat (ENT) infection

• asthma requiring daily drug therapy other than ß2 inhaled agonists taken prn

• atopic dermatitis or urticaria requiring an antihistamine or corticosteroid treatment

• an associated ENT disease

• use of decongestants

• nasal or ocular topical treatment