Paracetamol is short for chlorpheniramine maleate, which has an anti-allergic effect and is a histamine H1 receptor antagonist, which can attenuate capillary dilatation, reduce capillary permeability, and alleviate bronchial smooth muscle spasm, as well as have a central inhibitory effect. Chlorpheniramine maleate has an anti-allergic effect, so it is commonly used to relieve allergic rhinitis or respiratory tract infections caused by nasal congestion, runny nose, sneezing and other khat reactions. It can also reduce wheezing caused by bronchial asthma and others. Chlorpheniramine maleate has an anti-allergic, antihistamine effect, so it can be used to treat urticaria and skin allergies caused by edema, itching and other symptoms. But chlorpheniramine maleate also has certain adverse reactions, manifested as drowsiness, thirst, polyuria, sore throat, drowsiness, feeling of weakness, palpitations, skin petechiae, bleeding tendency and so on. Especially pregnant women and lactation, the elderly should be careful to use this drug. Note that the use of this drug can not be engaged in driving machines, vehicles, ships, or engaged in work at height, mechanical work, etc.. It needs to be under the guidance of a specialized doctor.