Generally speaking, the safety of cetirizine is relatively good, because cetirizine belongs to the second generation of antihistamines, which can effectively relieve children from a series of symptoms caused by allergic rhinitis and excessive release of histamine due to eczema, bronchial asthma, allergic cough, etc. However, if children apply cetirizine for a long time, it may also cause some adverse effects, such as children tend to have drowsiness, lack of energy, poorer mental status, etc. In addition, some children who take cetirizine for a long time may also suffer from poor appetite. Therefore, if cetirizine is applied to children, it should be applied for a short period of time, and the course of treatment and dosage should be in accordance with medical advice.