咳嗽是机体的一种保护性反射动作,将气管内痰液及异物排出体外,以保持呼吸道的清洁与畅通;因此,对于偶发、轻度的咳嗽,不必服用镇咳药,只有当咳嗽剧烈而且频繁,严重影响病人的生活和休息,或有导致并发症时,方可使用镇咳药。此类药物大多是通过抑制咳嗽中枢而发挥作用,镇咳作用 Cough is a protective reflex action of the body, the tracheal sputum and foreign body excreted to keep the respiratory tract clean and smooth; therefore, for occasional, mild cough, you do not have to take antitussive, and only when the cough is severe and Frequent, seriously affecting the patient’s life and rest, or lead to complications, before using antitussives. Most of these drugs through the inhibition of the cough center to play a role, antitussive effect