咳嗽是一种保护性反射动作,通过咳嗽反射能有效清除呼吸道内的分泌物或进入气道内的异物,一般不需用药即可自然缓解。但长期、剧烈而频繁的咳嗽使人不适,妨碍睡眠和休息,还可产生各种并发症,需要在针对病因治疗的同时,加用止咳药。此类药物品种繁多,发生滥用现象,因而必须严格? Cough is a protective reflex action, through the cough reflex can effectively clear the respiratory secretions or foreign body into the airway, generally without medication can be naturally relieved. But long-term, intense and frequent cough makes people uncomfortable, hinder sleep and rest, can also produce various complications, need to treat the cause of the same time, add cough medicine. The variety of such drugs, the phenomenon of abuse, which must be strict?