前言药品质量是关系全民健康的重大问题，各国制药企业历来都把药品出厂后的质量跟踪监测管理列为自己的一项重要工作内容，投入相应的力量，按期进行抽样检验，观察药品在贮存期（或有效期）内的质量是否有叨显的变化而影响其药效，以便于及时采取措施，防止意外事件的发生。? Foreword The quality of medicines is a major issue that affects the health of all people. Pharmaceutical manufacturers all over the world have always listed the quality tracking and monitoring of pharmaceuticals as an important part of their work. They have invested their efforts to carry out sampling tests as scheduled and observe the effects of drugs (Or expiration date) of the quality of the obvious changes in the impact of its efficacy, in order to take timely measures to prevent the occurrence of accidents. ?