Formulary-related insurance denials of single-source branded drugs in the US

JAMA

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About The Study: Among this large, diverse sample of individuals in the United States, formulary rejections were frequent and often resulted in delayed or absent treatment, highlighting trade-offs between cost and access to medicines.

Corresponding Author: To contact the corresponding author, Joseph F. Levy, PhD, email jlevy@jhu.edu.

To access the embargoed study: Visit our For The Media website at this link https://media.jamanetwork.com/

(doi:10.1001/jama.2026.8702)

Editor’s Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support.

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Journal

JAMA