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Aaron S. Kesselheim

Professor of Medicine, Harvard Medical School; co-author

Appears in 1 story

Education: Harvard T.H. Chan School of Public Health, University of Pennsylvania Carey Law School, Perelman School of Medicine at the University of Pennsylvania

Last updated Nov 1, 2026

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Average drug patent count triples since 1990, JAMA study finds

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As of October 2026: Co-author of the JAMA study and longtime drug-policy researcher

The average FDA-approved drug now carries more than three times as many patents as it did in 1990. A JAMA study of 1,981 small-molecule drugs found the mean patent count per drug rose from 2.1 to 6.9 between 1990 and 2019.

Updated Oct 11