有些药品,特别是抗生素,生物制品,脏器制剂,由于自身性质或受到外界条件如光线、温度、水份、空气等的影响,在贮存期间会产生药效降低等变化,为保证药品使用的安全有效,对这类药品必须制订有效期。 Some medicines, especially antibiotics, biological products and visceral preparations, may have some effects such as lower efficacy during storage due to their own properties or exposure to external conditions such as light, temperature, moisture and air. In order to ensure the use of medicines Safe and effective, for such drugs must be developed for a period of validity.