Appeals Court Revives Lawsuits Alleging Tylenol Causes Autism and ADHD

Dow Jones07-14

A federal appeals court revived more than 500 lawsuits that allege Tylenol and generic acetaminophen can cause attention-deficit hyperactivity disorder or autism if taken during pregnancy.

The Second U.S. Circuit Court of Appeals in Manhattan ruled that a trial judge had erred by excluding expert medical witnesses offered by the plaintiffs who were expected to testify that there was a link between Tylenol use during pregnancy and neurodevelopmental disorders such as autism and A.D.H.D. The decision sends the case back to the lower court for further proceedings.

The trial judge had previously ruled that reports by experts including Dr. Andrea Baccarelli, the dean of Harvard University's public health school, cherry-picked results and were unreliable. That decision essentially gutted the plaintiffs' case before trial.

Scientists have been studying a potential relationship between acetaminophen use and neurodevelopmental disorders for decades. That link hasn't been proven, and acetaminophen has been long recommended by the major medical groups as the preferable painkiller for women to take during pregnancy.

Tylenol is manufactured by Kenvue, a consumer-health company spun off from Johnson & Johnson. Kimberly-Clark has agreed to buy it for more than $40 billion.

Write to Erin Mulvaney at erin.mulvaney@wsj.com

(END) Dow Jones Newswires

July 13, 2026 13:27 ET (17:27 GMT)

Copyright (c) 2026 Dow Jones & Company, Inc.

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