Skip to Content


ANDAs: Blend Uniformity Analysis; Withdrawal of Draft Guidance

Document Details

Information about this document as published in the Federal Register.

Published Document

This document has been published in the Federal Register. Use the PDF linked in the document sidebar for the official electronic format.

Start Preamble


Food and Drug Administration, HHS.


Notice; withdrawal.


The Food and Drug Administration (FDA) is announcing the withdrawal of a draft guidance that was issued on August 27, 1999.

Start Further Info


Devinder S. Gill, Center for Drug Evaluation and Research (HFD-623), Food and Drug Administration, 7500 Standish Pl., Rockville, MD 20855, 301-827-5848.

End Further Info End Preamble Start Supplemental Information


In a notice published in the Federal Register of August 27, 1999 (64 FR 46917), FDA announced the availability of a draft guidance for industry entitled “ANDAs: Blend Uniformity Analysis.” The draft guidance was intended to provide recommendations to sponsors of abbreviated new drug applications (ANDAs) on what information should be provided in an ANDA to support the demonstration and bioequivalence batches and to establish in-process acceptance criteria related to blend uniformity analysis (BUA) for the manufacture of some drug products. Written comments on the draft guidance were to be submitted by October 26, 1999.

After careful consideration of the comments received, FDA has decided to withdraw the draft guidance. The information and comments from the public raised scientific issues relating to the scope of the guidance and methodology for blend uniformity analysis in general, including the: (1) Adequacy of current blend sampling Start Printed Page 35121techniques and (2) appropriateness of various test methods for assessing blend uniformity. The agency has decided that further research on BUA is needed. FDA is participating in research on BUA through the Product Quality Research Institute (PQRI). Based on the results of the research and recommendations submitted by PQRI, FDA will determine whether a new guidance on BUA will be issued.

An applicant or manufacturer must still comply with any applicable regulations regardless of the status of this guidance. For example, an application must include specifications and analytical methods to ensure the identity, strength, quality, purity, and bioavailability of the drug product (21 CFR 314.50(d)(1)(ii)(a)), and a manufacturer must monitor and validate the performance of processes that could be responsible for variability, including adequacy of mixing to ensure uniformity and homogeneity (21 CFR 211.110(a)(3)). An evaluation of uniformity of a blend may be necessary to fulfill such requirements.

Start Signature

Dated: May 6, 2002.

Margaret M. Dotzel,

Associate Commissioner for Policy.

End Signature End Supplemental Information

[FR Doc. 02-12359 Filed 5-16-02; 8:45 am]