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Regulations last checked for updates: Sep 11, 2025
Title 21 - Food and Drugs last revised: Sep 04, 2025
All Titles
Title 21
Chapter I
Part 320
Subpart B - Subpart B—Procedures for Determining the Bioavailability or Bioequivalence of Drug Products
§ 320.21 - Requirements for submission of bioavailability and bioequivalence data.
§ 320.22 - Criteria for waiver of evidence of in vivo bioavailability or bioequivalence.
§ 320.23 - Basis for measuring in vivo bioavailability or demonstrating bioequivalence.
§ 320.24 - Types of evidence to measure bioavailability or establish bioequivalence.
§ 320.25 - Guidelines for the conduct of an in vivo bioavailability study.
§ 320.26 - Guidelines on the design of a single-dose in vivo bioavailability or bioequivalence study.
§ 320.27 - Guidelines on the design of a multiple-dose in vivo bioavailability study.
§ 320.28 - Correlation of bioavailability with an acute pharmacological effect or clinical evidence.
§ 320.29 - Analytical methods for an in vivo bioavailability or bioequivalence study.
§ 320.30 - Inquiries regarding bioavailability and bioequivalence requirements and review of protocols by the Food and Drug Administration.
§ 320.31 - Applicability of requirements regarding an “Investigational New Drug Application.”
§ 320.32 - Procedures for establishing or amending a bioequivalence requirement.
§ 320.33 - Criteria and evidence to assess actual or potential bioequivalence problems.
§ 320.34 - Requirements for batch testing and certification by the Food and Drug Administration.
§ 320.35 - Requirements for in vitro testing of each batch.
§ 320.36 - Requirements for maintenance of records of bioequivalence testing.
§ 320.38 - Retention of bioavailability samples.
§ 320.63 - Retention of bioequivalence samples.
authority:
21 U.S.C. 321
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351
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352
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