一、为什么镇咳药常与祛痰药合用? 咳嗽是一种生理性防御反射。是通过咳嗽反射的反射弧来完成的。按照镇咳药的作用部位可将其分成两大类:第一类是抑制咳嗽中枢的中枢性镇咳药,如可待因、咳必清等;第二类是抑制感受器传人、传出神经冲动传递的末梢性镇咳药,如退嗽、甘草流浸膏等。此二类药物均可使咳嗽这一生理防御反射机能受到抑制,结果必将阻碍气管、支气管内痰液的排出。由于痰液中含有病原微生物,在呼吸道滞留后会加 First, why antitussive often used in combination with expectorant? Cough is a physiological defensive reflex. It’s done through the reflex arc of the cough reflex. In accordance with the role of antitussive site can be divided into two categories: the first is the central anti-cough suppress cough center, such as codeine, cough clear, etc .; the second category is the inhibition of receptor transmission, the transmission of nerve impulse transmission Of the distal antitussive drugs, such as cough, licorice extract and so on. Both types of drugs can make cough, a physiological defense reflex inhibition, the results will hinder tracheal, bronchial sputum discharge. Because sputum contains pathogenic microorganisms, will be added after the airway retention