BACKGROUND: Cetirizine and desloratadine are antihistamines active in the treatment of symptoms associated with seasonal allergic rhinitis and chronic urticaria.

• 背景：西替立嗪和地氯雷他定是抗组胺剂，可用于治疗季节性变应性鼻炎和慢性荨麻疹相关症状。