Tylenol Autism Lawsuit: The Court's Rulings on the Experts in MDL No. 3043
The federal acetaminophen autism and ADHD lawsuits were gathered in one multidistrict litigation, MDL No. 3043, before Judge Denise L. Cote in the Southern District of New York. The court excluded the testimony of the plaintiffs' general causation experts, first a group and then a later one. The Panel's report of October 1, 2026 lists 113 actions still pending, of 777 in total. This page quotes the rulings, and the checker below reads them for your situation.
It states no settlement or award: no document read for this page describes one.
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Pick the child's diagnosis and where a case stands to see what the court's rulings say about it, in their own words. Then add up the costs you can document, to bring one figure to a lawyer.
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What the Tylenol autism lawsuit claims
The court's page describes the cases as ones in which the plaintiffs “assert that children developed autism spectrum disorder and/or attention deficit/hyperactivity disorder as a result of in utero exposure to acetaminophen.” (U.S. District Court for the Southern District of New York, MDL No. 3043 website (read Oct. 6, 2026))
Its first opinion puts the legal claim this way: “The plaintiffs in this MDL assert that the defendants violated their state law duties to warn consumers of the risk that children may develop autism spectrum disorder” (Opinion and Order, In re Acetaminophen - ASD-ADHD Products Liability Litigation, MDL No. 3043, No. 1:22-md-3043-DLC, ECF No. 1381, at 5 (S.D.N.Y. Dec. 18, 2023)), and attention-deficit/hyperactivity disorder. And its second names who was sued: “Plaintiffs sued the manufacturer of Tylenol (Johnson & Johnson Consumer Inc.) and retailers of store-branded acetaminophen products,” (Opinion and Order, In re Acetaminophen - ASD-ADHD Products Liability Litigation, MDL No. 3043, No. 1:22-md-3043-DLC, ECF No. 1494, at 3 (S.D.N.Y. July 10, 2024)) alleging the labels fell short under state law.
These are claims and allegations. The court's rulings, quoted below, are about whether the plaintiffs' experts could testify on general causation: whether exposure to acetaminophen before birth can cause either condition at all.
The court's first ruling on the experts
General causation asks whether a substance can cause a condition at all, and in a case like this it needs expert testimony. The court began by noting: “Each of the parties’ experts is eminently qualified.” (Opinion and Order, In re Acetaminophen - ASD-ADHD Products Liability Litigation, MDL No. 3043, No. 1:22-md-3043-DLC, ECF No. 1381, at 5 (S.D.N.Y. Dec. 18, 2023))
It ruled: “For the following reasons, the defendants’ motions to preclude the testimony of plaintiffs’ general causation experts are granted.” (Opinion and Order, In re Acetaminophen - ASD-ADHD Products Liability Litigation, MDL No. 3043, No. 1:22-md-3043-DLC, ECF No. 1381, at 5 (S.D.N.Y. Dec. 18, 2023))
And it said what followed from that: “With these rulings, the plaintiffs do not have admissible evidence to demonstrate that prenatal exposure to acetaminophen causes either ASD or ADHD in offspring.” (Opinion and Order, In re Acetaminophen - ASD-ADHD Products Liability Litigation, MDL No. 3043, No. 1:22-md-3043-DLC, ECF No. 1381, at 5 (S.D.N.Y. Dec. 18, 2023))
The second ruling, on a later expert
Plaintiffs in later cases brought a new expert: “Plaintiffs in more recently filed actions rely on another expert, Dr. Roberta Ness.” (Opinion and Order, In re Acetaminophen - ASD-ADHD Products Liability Litigation, MDL No. 3043, No. 1:22-md-3043-DLC, ECF No. 1494, at 3 (S.D.N.Y. July 10, 2024)) Her opinion concerned ADHD alone.
The court ruled: “For the following reasons, the defendants’ motion to preclude the testimony of Dr. Ness is granted.” (Opinion and Order, In re Acetaminophen - ASD-ADHD Products Liability Litigation, MDL No. 3043, No. 1:22-md-3043-DLC, ECF No. 1494, at 3 (S.D.N.Y. July 10, 2024)) And it explained: “Nevertheless, the weaknesses in her report, confirmed by her deposition testimony, render her opinion on causation unreliable and inadmissible.” (Opinion and Order, In re Acetaminophen - ASD-ADHD Products Liability Litigation, MDL No. 3043, No. 1:22-md-3043-DLC, ECF No. 1494, at 83 (S.D.N.Y. July 10, 2024))
What has happened since
The court's MDL page lists its selected orders and opinions, and the second ruling is the last of them read for this page. No later ruling, appeal or judgment was read, so this page says nothing about what followed.
The Panel's report of October 1, 2026 lists 113 actions still pending in the MDL, and 777 in total since it began. The figures are the report's, as of its date, and this page prints them with that date.
The records a claim rests on
A claim of this kind turns on the pregnancy and the child: records of acetaminophen use during the pregnancy, with the products and the dates, the prenatal care records, the child's diagnosis with its date and who made it, and the records of evaluations and therapy, with the bills.
Keep them together, with the dates. A lawyer will ask for them first.
Where the federal cases are
The MDL is No. 3043, before Judge Denise L. Cote, master docket 1:22-md-3043. The Panel's report lists the date transferred as October 5, 2022. The court's page gives the docket: “The MDL docket number for this action is 1:22-md-3043 (DLC).” (U.S. District Court for the Southern District of New York, MDL No. 3043 website (read Oct. 6, 2026))
What this page does not say about money
No document read for this page describes a settlement, a verdict or a trial figure in this MDL, so this page states none and does not estimate one.
What the checker above does is add up the costs you can document, such as therapy or evaluations, so you have one figure to bring to a lawyer. It is the sum of what you enter and nothing else.
Talking to a lawyer about a Tylenol autism lawsuit
This site is not a law firm, does not refer anyone to a lawyer, and cannot say what a claim would recover. The questions that decide a claim are a lawyer's: what the court's rulings mean for it, what has happened since, and whether any court would hear it now.
Bring the pregnancy and prenatal records, the child's diagnosis and treatment records, your record of costs, and the rulings this page quotes.