Paracetamol is an anti-allergy drug and can be taken for a few days at most. It is recommended to use the drug safely under the guidance of a doctor. Paracetamol is a first generation antihistamine, mainly used for skin allergic diseases, such as urticaria, eczema, itchy skin, neurodermatitis and insect bites, but also for the treatment of allergic rhinitis, food allergies or drug allergies. It is recommended that patients stop taking paracetamol in time, usually not more than 7 days. If there is no satisfactory effect after use, patients are advised to visit the Department of Allergy and follow the doctor’s advice to change to other treatment options. The strong antihistamine effect of paracetamol has a significant central inhibitory effect and may cause drowsiness and fatigue, so drivers, overhead workers and operators of precision instruments should not work during the medication period.