慢性咳嗽、咯痰是老年性慢性支气管炎(简称“老慢支”)患者最常见、最主要的两大症状,起初往往为清晨起床时咳嗽、咯痰,以后逐渐发展到无论日夜、整天都有。每当吸烟、接触冷空气或感冒后,更易引起咳嗽加剧,咯痰增多。剧烈的咳嗽严重影响患者的工作、学习和休息。于是很多病人常常不加选择地服用镇咳药,期望减轻其咳嗽症状,结果却适得其反,常常是不但没减轻和消除这些症状,反而加重了病情,有的甚至会因此而出现生命危险。这是为什么呢?事实上,咳嗽是种本能保护性的反射动作,以强力的呼气来清除呼吸道中的异物分泌液,目的是保护呼吸道的通畅和清洁。镇咳药是通过阻断咳嗽反射而达到镇咳目的的一类 Chronic cough, expectoration is senile chronic bronchitis (referred to as “old chronic bronchitis”) the most common and the two main symptoms, initially tend to get up early in the morning cough, expectoration, and later gradually developed to both day and night, All day Whenever smoking, exposure to cold air or cold, the more likely to cause increased cough, expectoration increased. Severe cough seriously affects the patient’s work, study and rest. As a result, many patients often take antitussives unconsciously and expect to relieve their cough symptoms. The result is counterproductive. However, it often results in not only reducing or eliminating these symptoms, but exacerbating the disease and sometimes even risking their lives. This is why? In fact, cough is a kind of instinctive protective reflex action, with strong breath to remove foreign body fluid in the respiratory tract, the purpose is to protect the airway patency and clean. Antitussive is a type of antitussive that is achieved by blocking cough reflexes