How long is the previous lot valid for use after a new lot is developed?
Please consult the Official USP Reference Standards Catalog, published bimonthly as a stand–alone document. Two columns appear in the catalog to identify the current official lots. One column identifies the official lot currently being shipped by USP. If the field is blank, then the current lot is not in distribution. In some cases, the previous lot may still be considered official. If this is the case, it is identified in the second column. Ordinarily, the previous lot is carried in official status for one year after the current lot has been depleted, unless, because of a change in monograph requirements or stability limitations, the previous lot is found to be no longer suitable for its intended use. Indication is given for the month and year through which previous lots may be used. (View USP’s policy statement on expiration dating of Reference Standards.
Please consult the official USP Reference Standards Catalog, published bimonthly online and every four months in print. Two columns appear in the catalog to identify the current official lots. One column identifies the official lot currently being shipped by USP. If the field is blank, then the current lot is not in distribution. In some cases, the previous lot may still be considered official. If this is the case, it is identified in the second column. Ordinarily, the previous lot is carried in official status for one year after the current lot has been depleted, unless the previous lot is found to be no longer suitable for its intended use because of a change in monograph requirements or stability limitations. The catalog indicates the month and year through which previous lots may be used.
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