Efficacy and Safety of Levocetirizine and Fexofenadine in Reducing Symptoms of Seasonal Allergic Rhinitis

Inclusion Criteria: * adults 18 to 55 years both inclusive * suffering at least 2 years of seasonal allergic rhinitis due to grass pollen * positive RAST and/or positive skin prick test * comply with study restrictions Exclusion Criteria: * known alcohol or drug addiction or abuse * known allergy/intolerance to lactose, cellulose, cornstarch * presence of nasal anatomical deformities leading to \> 50% obstruction * ENT infection within 30 days of the study * use of disallowed medication * ongoing desensitization * known cardiac, renal or hepatic dysfunction * presenting allergic bronchial asthma * use of cimetidine * intending to donate blood during the trial