By Diana Novak Jones
(Reuters) -Families appealing the dismissal of their lawsuits alleging that Kenvue’s Tylenol or generic versions of the pain-relief medication caused their children’s autism are asking an appeals court to consider President Donald Trump’s new advice that pregnant women avoid the pain killer as it decides whether to revive their lawsuits.
Ashley Keller, an attorney representing the plaintiffs, filed a letter Wednesday alerting the New York-based 2nd U.S. Circuit Court of Appeals to the Trump administration’s stance on the alleged link between Tylenol and autism. In a news conference at the White House on Monday, Trump delivered medical advice to pregnant women, repeatedly telling them not to use acetaminophen, the active ingredient in Tylenol.
A judge last year dismissed hundreds of lawsuits alleging a connection between Tylenol or generic versions of the drug and autism or ADHD diagnoses, saying that the experts the plaintiffs relied on had failed to support their conclusions with scientific evidence.
In Wednesday’s letter, Keller told the appeals court that a ruling upholding the lower court’s decision would pose “grave separation of powers concerns,” because the Trump administration had turned to one the same experts in developing its position.
Keller noted that during Monday’s press conference, U.S. Food and Drug Commissioner Marty Makary, Health Secretary Robert F. Kennedy Jr. and Trump cited the research on Tylenol and autism done by Andrea Baccarelli, currently dean of the faculty at the Harvard T.H. Chan School of Public Health, one of the plaintiffs’ experts.
In a statement, a Kenvue spokesperson noted that the FDA said a causal relationship has not been established between Tylenol and autism and said the company believes it will continue to be successful in the litigation as the claims lack legal merit and scientific support.
MORE THAN 500 LAWSUITS DISMISSED
U.S. District Judge Denise Cote in Manhattan last year dismissed more than 500 lawsuits against Kenvue and retailers that sold store-brand acetaminophen, which alleged that the drugs caused autism spectrum disorder, or ADHD. Cote had ruled the previous year that none of the expert witnesses offered by the plaintiffs to testify at trial that acetaminophen could cause the conditions had used a sound scientific methodology. She said the experts’ “unstructured approach” allowed “cherry-picking” and a “results-driven analysis.”
Product liability lawsuits, like the ones over acetaminophen, rely on experts to establish that a product is capable of causing the alleged harm.
The 2nd Circuit is slated to hear arguments on October 6 in the plaintiffs’ appeal of Cote’s decision.
In Wednesday’s letter, Keller argued that a decision “holding that a jury may not hear the same expert evidence that the executive branch credited will badly damage the public trust required for the executive to take care that the public-health laws are faithfully executed.”
Legal experts have said it would be unusual if the appeals court gave the administration’s actions and Trump’s comments much weight in considering how to move forward with the cases.
“It’s not as if there’s been a new study that has been announced that has a different conclusion,” Elizabeth Chamblee Burch, a professor at the University of Georgia’s School of Law whose research focuses on cases like the Tylenol litigation, said on Tuesday before Keller filed the letter.
Researchers say there is no firm evidence of a link between the use of Tylenol and autism. A 2024 study of nearly 2.5 million children in Sweden found no causal link between in utero exposure to acetaminophen and neurodevelopmental disorders.
A 2025 review of 46 earlier studies that Baccarelli participated in did suggest a link between prenatal acetaminophen exposure and increased risks of these conditions, but the researchers from the Icahn School of Medicine at Mount Sinai, Harvard University and others said the study does not prove the drug caused the outcomes.
(Reporting by Diana Novak Jones; Editing by Alexia Garamfalvi and Leslie Adler)
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