Cough suppressants are cough suppressants, which can be divided into central cough suppressants and peripheral cough suppressants, common cough suppressants are dextromethorphan, nalcodone, etc. Cough suppressants can directly inhibit the median brain cough center and play a role in suppressing cough. 1. Central cough suppressants: can directly inhibit the medulla oblongata cough center, and play the role of cough, mainly used for dry cough without sputum, commonly used drugs are dextromethorphan, Pentoxyverine and so on. 2. Peripheral cough suppressants: can inhibit the cough reflex arc in the peripheral receptors, afferent nerves or efferent nerves, effectors which either relieve and play a cough suppressant role, commonly used drugs are that can be Ding, benzonate and so on. However, it is not necessary to take cough medicine to stop cough, cough also need to be carried out for the cause of the disease, such as allergies caused by cough, you can through the antihistamine (such as loratadine) or inhalation glucocorticoids (such as budesonide) to stop coughing. When cough symptoms occur, you need to pay attention to protect the respiratory tract, wear a mask when you go out, and avoid spicy and irritating food in your diet. Cough medication should be used under the guidance of a doctor, avoid self-medication.