Base
RuleOpen for Comment2026-193502026-09-22

Nonclinical Testing Terminology

Health and Human Services Department, Food and Drug Administration

Abstract

The Food and Drug Administration (FDA, Agency, or we) is issuing a direct final rule that substitutes references to "animal" tests or studies with "nonclinical" tests or studies, adds a definition of the terms "nonclinical test" and "nonclinical study," and makes other comparable or conforming amendments in certain safety and reporting sections of its regulations. The direct final rule also substitutes "nonclinical" for "preclinical" and "in vitro" for consistency in terminology. The Agency is issuing these amendments directly as a final rule because we believe they are noncontroversial changes in terminology that are not expected to affect industry practice and FDA anticipates no significant adverse comments. These amendments align with recent amendments to the Federal Food, Drug, and Cosmetic Act (FD&C Act) and the Public Health Service Act (PHS Act) and are intended to remove an emphasis, in certain places, on the use of animal testing as the only scientific methodology to assess the safety of a drug in the nonclinical setting. These changes may also foster the development and use of scientifically valid new testing methodologies, potentially improving predictive accuracy of product safety testing while replacing, reducing, or refining animal use. The rule adds no new requirements.

Action & Dates

Action
Direct final rule.
Dates
This rule is effective February 4, 2027. Either electronic or written comments on the direct final rule or its companion proposed rule must be submitted by December 7, 2026. If FDA receives no significant adverse comments within the specified comment period, the Agency intends to publish a document confirming the effective date of the direct final rule in the Federal Register within 30 days after the comment period on this direct final rule ends. If timely significant adverse comments are received, the Agency will publish a document in the Federal Register withdrawing this direct final rule within 30 days after the comment period on this direct final rule ends.
Effective Date
2027-02-04

CFR References

Topics

Administrative practice and procedureBiologicsConfidential business informationDrugsExportsImportsInvestigationsLabelingMedical researchPrescription drugsRadiation protectionReporting and recordkeeping requirementsSafety

Public Comment

Comments Close
2026-12-07 — Open for comment

Document Excerpt

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Department of Health and Human Services Food and Drug Administration 21 CFR Parts 312, 314, 315, 361, and 601 [Docket No. FDA-2026-N-5347] RIN 0910-AJ27 AGENCY: Food and Drug Administration, HHS. ACTION: Direct final rule. SUMMARY: The Food and Drug Administration (FDA, Agency, or we) is issuing a direct final rule that substitutes references to “animal” tests or studies with “nonclinical” tests or studies, adds a definition of the terms “nonclinical test” and “nonclinical study,” and makes other comparable or conforming amendments in certain safety and reporting sections of its regulations. The direct final rule also substitutes “nonclinical” for “preclinical” and “in vitro” for consistency in terminology. The Agency is issuing these amendments directly as a final rule because we believe they are noncontroversial changes in terminology that are not expected to affect industry practice and FDA anticipates no significant adverse comments. These amendments align with recent amendments to the Federal ( printed page 59989) Food, Drug, and Cosmetic Act (FD&C Act) and the Public Health Service Act (PHS Act) and are intended to remove an emphasis, in certain places, on the use of animal testing as the only scientific methodology to assess the safety of a drug in the nonclinical setting. These changes may also foster the development and use of scientifically valid new testing methodologies, potent…

Read full document on FederalRegister.gov →

Related Documents

Other Federal Register documents from the same docket.

Full Document

Citation: 91 FR 59988