药品的有效期是指药品在一定的贮存条件下,能保持质量的期限。一些稳定性差的药品,在贮存中易变质,有的甚至毒性增高,不能药用。为了保证药品的安全有效,卫生部对抗生素、生物制品、生化制剂和其它一些容易变质的药品规定了有效期。中国药典1990年版收载的药品,规定有效期的品种达119种。然而,有些有效期药品由于储运、销售到使用的 Validity of the drug refers to the drug in a certain storage conditions, to maintain the quality of the deadline. Some poor stability of drugs, metamorphism in storage, and some even increased toxicity, can not be medicated. In order to ensure the safety and effectiveness of medicines, the Ministry of Health stipulates the expiration date of antibiotics, biological products, biochemical preparations and other easily spoiled medicines. Chinese Pharmacopoeia 1990 edition of the drugs contained in the provisions of the validity of 119 species. However, some expiration date medicines are sold and used for sale