A Study to Compare the Efficacy of Levocetirizine to Placebo in Reducing Symptoms of Seasonal Allergic Rhinitis (SAR) in Sensitive Subjects Exposed to Ragweed Pollen
A Study to Compare the Efficacy of Levocetirizine to Placebo in Reducing Symptoms of Seasonal Allergic Rhinitis (SAR) in Sensitive Subjects Exposed to Ragweed Pollen
The purpose of the study is to assess the efficacy comparability of cetirizine and
 levocetirizine, by comparing the effects of single intake of the two drugs to placebo in
 reducing symptoms of seasonal allergic rhinitis (SAR) in ragweed sensitive adult subjects
 exposed to ragweed pollen in an Environmental Exposure Unit.
Inclusion Criteria:

 -  Female subject of non-childbearing potential or of childbearing potential agreeing not
 to become pregnant during the study.

 -  Have had seasonal allergic rhinitis due to Ragweed for the last 2 consecutive years

 -  Subjects who obtain a minimum sum considering SAR related symptoms (mean value) as
 defined by protocol

 Exclusion Criteria:

 -  Any clinically significant condition that might interfere with the treatment
 evaluation, both for efficacy and safety

 -  Have used forbidden concomitant medications as defined by the protocol