Cetirizine hydrochloride tablets are third-generation antihistamines, or anti-allergy drugs as they are commonly known, and are mainly used to treat symptoms such as runny nose, sneezing, red eyes and itchy eyes caused by allergic rhinitis. It can also be used to treat skin allergies such as hives and allergies to pollen. Other drugs belonging to the third generation of antihistamines include levocetirizine hydrochloride, loratadine, and fexofenadine. Compared to the first and second generation antihistamines, the central depressant effect of the third generation antihistamines is milder, which means that they cause less drowsiness, but it is still recommended to use them at night before bedtime. In addition, when using these drugs, try not to take other drugs with central depressant effects, such as sedative-hypnotics, at the same time.