药品是一种特殊商品 ,是人类预防和治疗疾病、强身健体的重要武器。药品区别于其它商品的特征之一就是依据其独有的性质规定了它的使用期限 ,并以法律的形式确定下来供人们共同遵守 ,以保证人们用药的科学、安全和有效。目前 ,我国国家药品标准和各地方药品标准仅对少数抗生素 Medicines are a kind of special commodity, which is an important weapon for human being to prevent and cure diseases and to keep fit and healthy. One of the distinguishing features of a drug from other products is that it sets its useful life on the basis of its unique properties and is legally determined for common compliance so that people can use it safely, scientifically, safely and effectively. At present, China’s national drug standards and local drug standards only for a small number of antibiotics