• Qing Liu, Barbara M Davit, Svetlana A Cherstniakova, Suman Dandamudi, Johnetta F Walters, Christina H Lee, Kimberly W Raines, Ke Ren, Leeh N Williamson, and Dale P Conner.
• US Food and Drug Administration, Center for Drug Evaluation and Research, Office of Generic Drugs, Rockville, Maryland 20855, USA. qing.liu@fda.hhs.gov
• Aaps J. 2012 Mar 1; 14 (1): 19-22.

PurposeA generic product must meet the standards established by the Food and Drug Administration (FDA) to be approved for marketing in the USA. FDA approves a generic product for marketing if it is proved to be therapeutically equivalent to the reference product. Bioequivalence (BE) between a proposed generic product and its corresponding reference product is one of the major components of therapeutic equivalence. These approvals may be delayed if the BE portion of the submission is determined to be deficient. Many of these BE deficiencies recur commonly and can be avoided.MethodWe conducted a survey of the BE submissions to abbreviated new drug applications (ANDAs) over years 2001 to 2008 to identify the most commonly occurring BE deficiencies.ResultsRecurring deficiencies are found in a majority of the ANDAs reviewed by FDA's Division of Bioequivalence. The most common deficiencies were the two deficiencies related to dissolution (method and specifications) found in 23.3% of the applications and analytical method validation and/or report found in 16.5% of the applications. The approval of generic drugs would be greatly accelerated if these deficiencies could be avoided.

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