CFR - Code of Federal Regulations Title 21

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For the most up-to-date version of CFR Title 21, go to the Electronic Code of Federal Regulations (eCFR).

[Code of Federal Regulations]

[Title 21, Volume 5]

[CITE: 21CFR320.29]

TITLE 21--FOOD AND DRUGS

CHAPTER I--FOOD AND DRUG ADMINISTRATION
DEPARTMENT OF HEALTH AND HUMAN SERVICES

SUBCHAPTER D - DRUGS FOR HUMAN USE

PART 320 -- BIOAVAILABILITY AND BIOEQUIVALENCE REQUIREMENTS

Subpart B - Procedures for Determining the Bioavailability or Bioequivalence of Drug Products

Sec. 320.29 Analytical methods for an in vivo bioavailability or bioequivalence study.

(a) The analytical method used in an in vivo bioavailability or bioequivalence study to measure the concentration of the active drug ingredient or therapeutic moiety, or its active metabolite(s), in body fluids or excretory products, or the method used to measure an acute pharmacological effect shall be demonstrated to be accurate and of sufficient sensitivity to measure, with appropriate precision, the actual concentration of the active drug ingredient or therapeutic moiety, or its active metabolite(s), achieved in the body.

(b) When the analytical method is not sensitive enough to measure accurately the concentration of the active drug ingredient or therapeutic moiety, or its active metabolite(s), in body fluids or excretory products produced by a single dose of the test product, two or more single doses may be given together to produce higher concentration if the requirements of § 320.31 are met.

[42 FR 1648, Jan. 7, 1977, as amended at 67 FR 77674, Dec. 19, 2002]