按照中华医学会耳鼻咽喉科学分会、中华耳鼻咽喉科杂志编缉委员会1997年海口会议提出的过敏性鼻炎诊断标准，选择季节性和常年性过敏性鼻炎患者为研究对象。
Using the diagnoses standard advanced by Chinese Otolaryngology Research Team and the committee of Chinese Otolaryngology Journal Editors in Haikou Meeting in 1997, ar suffers were selected randomly.
目的：评价左西替利嗪治疗常年性过敏性鼻炎的有效性和安全性。
AIM: To evaluate the efficacy and safety of levocetirizine and cetirizine in the treatment of perennial allergic rhinitis.
用于瘙痒和季节性鼻炎，常年性过敏性鼻炎引起的荨麻疹。
Pruritus and urticaria caused by seasonal rhinitis, perennial allergic rhinitis.
瘙痒和季节性鼻炎，常年性过敏性鼻炎引起的荨麻疹。
Itching and seasonal rhinitis, perennial allergic rhinitis induced urticaria.
目的：评价左西替利嗪治疗常年性过敏性鼻炎的有效性和安全性。
Objective To investigate and compare the effect and safety of levocetirizine and cetirizine for the treatment of chronic idiopathetic urticaria (CIU).
目的：评价左西替利嗪治疗常年性过敏性鼻炎的有效性和安全性。
Objective To investigate and compare the effect and safety of levocetirizine and cetirizine for the treatment of chronic idiopathetic urticaria (CIU).
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