有些稳定性较差的药品，随贮存期的延长，药效会降低，毒性会增高，有的甚至不能药用。为了保证用药的安全有效，对这类药品必须规定有效期。为此，卫生部于１９９０年制订并下发了“有效期药品品种及期限表”。但是，临床用药中除了规定有效期的品种外，还存在着大量没有... Some less stable drugs, with the extension of the shelf life, efficacy will be reduced, the toxicity will increase, and some can not even be medicated. In order to ensure the safe and effective use of drugs, such drugs must be provided for the expiry date. To this end, the Ministry of Health in 1990 formulated and issued a “list of valid varieties of drugs and deadlines.” However, clinical medication in addition to the provisions of the validity of varieties, there are still a large number of no ...