A Study Evaluating the Efficacy and Impact on Health-related Quality of Life of Levocetirizine in Adults With Seasonal Allergic Rhinitis

A Multi-center, Randomized, Double-blind, Placebo-controlled, Parallel-group Study Evaluating the Efficacy and Impact on Health-related Quality of Life of Levocetirizine 5 mg Once Daily Given for 2 Weeks in Subjects 18 yr of Age and Older With Seasonal Allergic Rhinitis

The study objective is to investigate the efficacy of levocetirizine in reducing symptoms associated with seasonal allergic rhinitis and in improving rhinitis-related Quality of Life

Inclusion Criteria:

• Subjects with a history of SAR symptoms
• A positive skin prick test at least one grass allergen
• Moderate - severe SAR symptoms at baseline
• Women of childbearing potential must use a medically acceptable form of contraception
• 80% compliance on run in study medication and 80% compliance on completing the diary

Exclusion Criteria:

• The presence of any clinically significant comorbid disease which may interfere with the study assessments
• The presence of renal disease
• Pregnant or breastfeeding
• Subject is currently participating in another clinical trial
• Known hypersensitivity to piperazines or any of the excipients
• Intake of medications prohibited before the start of the trial
• Subjects who started or changed the dose of immunotherapy
• Rhinitis medicamentosa
• Subjects with a recent history (within the last 2 years) of drug or alcohol abuse.