FDA Opens the Vault on Decision Letters—Releases Wave of Drug and Biologic CRLs

July 10, 2025

Reading Time : 1 min

This morning, the U.S. Food and Drug Administration (FDA) announced the publication of more than 200 decision letters, also known as complete response letters (CRLs), with plans to release more from the archives. The CRLs released today are associated with applications for drugs and biologics submitted for approval between 2020 and 2024 that have since been approved by the agency.

In the accompanying press release, FDA Commissioner Marty Makary, M.D., M.P.H., stated that drug developers have been “playing a guessing game when navigating the FDA…” and that “[d]rug developers and capital markets alike want predictability.” He indicated that the publication of these CRLs will help the agency to provide both parties with greater visibility into the agency’s processes, noting that this will hopefully bring “cures and meaningful treatments to patients faster.” The press release goes on to note that sponsors have “often misrepresent[ed] the rationale behind FDA’s decision to their stakeholders and the public.” In particular, “[a]ccording to a 2015 analysis conducted by FDA researchers, sponsors avoided mentioning 85% of the FDA’s concerns about safety and efficacy when announcing publicly that their application was not approved… [and that] when FDA calls for a new clinical trial for safety or efficacy, that critical information is not disclosed approximately 40% of the time.”

The release of negative decision letters to improve transparency is not a new idea. In fact, FDA’s campaign to release CRLs goes back more than 15 years, including the 2010 report released by FDA’s Transparency Task Force that proposed the disclosure of CRLs. As the press release alludes to, FDA resources will be implicated in reviewing these letters for the redaction of confidential and trade secret information.

Novel idea or not, today’s announcement will mean that companies will need to consider the implications of a CRL being released, both with regard to their investors and the public. It is possible that this will lead to more application withdrawals and may even hinder innovation in these areas. In turn, product developers, investors and others will potentially have greater insights into FDA’s expectations for particular types of drugs and biologics.

Share This Insight

Previous Entries

Eye on FDA

December 22, 2025

On December 18, 2025, the Food and Drug Administration (FDA) released a final guidance entitled “Processes and Practices Applicable to Bioresearch Monitoring Inspections.” The guidance was issued to comply with the Food and Drug Omnibus Reform Act of 2022, which directs FDA to issue guidance describing the processes and practices applicable to inspections of sites and facilities inspected under FDA’s Bioresearch Monitoring (BIMO) inspection program, to the extent that is not covered in already available FDA guides and manuals. The BIMO program was established to assess and monitor the conduct and reporting of FDA-regulated research as well as postmarketing activities through on-site inspections, investigations and Remote Regulatory Assessments.

...

Read More

Eye on FDA

December 15, 2025

On December 5, 2025, FDA announced its Technology-Enabled Meaningful Patient Outcomes (TEMPO) for Digital Health Devices Pilot, a new voluntary pilot that seeks to accelerate innovation and expand access to digital health devices for people living with chronic conditions. Under TEMPO, FDA will evaluate a new, risk-based enforcement approach that supports digital health devices intended for use to improve patient outcomes in cardio-kidney-metabolic, musculoskeletal and behavioral health conditions. Under the pilot, participating manufacturers may request that the agency exercise enforcement discretion for certain requirements, such as premarket authorization and investigational device requirements, while manufacturers collect and share real-world data demonstrating the device’s performance.

...

Read More

Eye on FDA

November 5, 2025

Last week, FDA released draft guidance titled “Scientific Considerations in Demonstrating Biosimilarity to a Reference Product: Updated Recommendations for Assessing the Need for Comparative Efficacy Studies.” This draft guidance reflects an evolution in FDA’s approach to determining whether a comparative clinical study with efficacy endpoints (a comparative efficacy study or CES) is necessary to support a demonstration of biosimilarity. Specifically, the agency notes that a comparative analytical assessment (CAA) is generally more sensitive when it comes to detecting differences between products than a CES.

...

Read More

Eye on FDA

October 27, 2025

On October 23, 2025, FDA released its final guidance regarding Patient-Focused Drug Development: Selecting, Developing, or Modifying Fit-for-Purpose Clinical Outcome Assessments. The guidance is the third guidance in a four-part series of FDA guidance focused on patient-focused drug development (PFDD) that describe how stakeholders, such as patients, caregivers, researchers, medical product developers and others can submit patient experience data and other relevant information that can be used for medical product development and regulatory decision making.

...

Read More

© 2025 Akin Gump Strauss Hauer & Feld LLP. All rights reserved. Attorney advertising. This document is distributed for informational use only; it does not constitute legal advice and should not be used as such. Prior results do not guarantee a similar outcome. Akin is the practicing name of Akin Gump LLP, a New York limited liability partnership authorized and regulated by the Solicitors Regulation Authority under number 267321. A list of the partners is available for inspection at Eighth Floor, Ten Bishops Square, London E1 6EG. For more information about Akin Gump LLP, Akin Gump Strauss Hauer & Feld LLP and other associated entities under which the Akin Gump network operates worldwide, please see our Legal Notices page.