No. The effective use period of the previous batch of standard substances of the currently sold batch shall be based on the published “New Situation of National Pharmaceutical Standard Substance Supply” in the announcement notice.
If different information is released during later periods for the same batch, the most recent announcement shall prevail.
If the information on the discontinuation of the batch is released within the effective use period, the discontinuation information shall prevail.
The NIFDC will not continue to monitor the quality of the following: standard substances outside the effective use period and non-latest batches without a specified effective use period (these are generally old batches no longer in the catalog). Users continuing to use these must verify their characteristic values and applicability themselves. Whether they can be used is determined by the nature of the variety and the conclusions of stability experiments.
We recommend that users buy only the amounts they are planning to use and do not stockpile large quantities to avoid waste caused by expiration and invalidation.