GUIDANCE DOCUMENT

Monoclonal Antibodies: Streamlined Nonclinical Safety Studies Draft Guidance for Industry December 2025

Draft

Not for implementation. Contains non-binding recommendations.

This guidance is being distributed for comment purposes only.

Submit Comments by 02/02/2026

Although you can comment on any guidance at any time (see 21 CFR 10.115(g)(5)), to ensure that the FDA considers your comment on a draft guidance before it begins work on the final version of the guidance, submit either online or written comments on the draft guidance before the close date.

If unable to submit comments online, please mail written comments to:

Dockets Management Food and Drug Administration 5630 Fishers Lane, Rm 1061 Rockville, MD 20852

All written comments should be identified with this document’s docket number: FDA-2025-D-4634

Docket Number: FDA-2025-D-4634 Issued by:

Guidance Issuing Office

Center for Drug Evaluation and Research

The Food and Drug Administration (FDA or Agency) is announcing the availability of a draft guidance for industry entitled “Monoclonal Antibodies: Streamlined Nonclinical Safety Studies.” The draft guidance provides recommendations for streamlined approaches to assess long-term safety from monoclonal antibodies that recognize a single molecular target (referred to as monospecific antibodies); describes when general toxicology studies are not warranted or may be limited to a short-term study; and addresses reproductive, developmental, and juvenile toxicity assessments. When finalized, the guidance is intended to assist sponsors in avoiding unnecessary use of animals, particularly non-human primates (NHPs), in furtherance of the 3R principles of reducing, refining, and replacing the use of animal testing.