Overview
Acetaminophen ASD-ADHD lawsuits — MDL 3043, In re Acetaminophen — ASD-ADHD Products Liability Litigation, S.D.N.Y., Judge Denise L. Cote. Plaintiffs (parents of children diagnosed with ASD or ADHD) allege prenatal and postnatal acetaminophen (Tylenol and generics) exposure contributed to their children’s diagnoses on failure-to-warn theories, and name J&J and retail pharmacies that sold acetaminophen as defendants (per complaints and court records). After the district court excluded plaintiffs’ general causation experts and dismissed ~500 cases (2023–2024, per court orders and reports), the U.S. Court of Appeals for the Second Circuit vacated and remanded on July 13, 2026, reviving ~550 cases (per the court’s opinion and reports). Causation remains contested; the litigation is pending. We track the public record — we do not promise or predict outcomes.
Status of the science / claims: Plaintiffs allege prenatal/postnatal acetaminophen exposure contributed to ASD/ADHD diagnoses; experts on both sides dispute the observational evidence and confounders. The district court excluded plaintiffs’ general causation experts (2023–2024), and the Second Circuit remanded for further proceedings on July 13, 2026 (per court opinions and reports). Causation remains contested.
Key people
Companies involved
Settlement amounts
No global settlement is on the public record as of August 2026. Following the Second Circuit’s July 13, 2026 remand, individual cases proceed in district court (per the court’s opinion and reports). No payout amount is available or can be promised.
Case count
| Month | Filed cases | Δ |
|---|---|---|
| Jul 13, 2026 | 550 | +50 |
| Jun 1, 2024 | 500 | +100 |
| Jun 1, 2023 | 400 | +335 |
| Oct 1, 2022 | 65 | — |
Key dates
- July 13, 2026Second Circuit vacates and remands; ~550 cases revived (per the court’s opinion and reports)
- August 15, 2024Second round of expert exclusions and dismissals (per court orders and reports)
- December 8, 2023Plaintiffs’ general causation experts excluded on Daubert motion; ~500 cases dismissed (per court orders and reports)
- October 5, 2022JPML transfers the first 65 cases to S.D.N.Y. and establishes MDL 3043 (per JPML)
Updates
- Updated Aug 1, 2026Seeded from research (Aug 31, 2026): MDL 3043 (S.D.N.Y., Judge Cote); ~550 cases revived after the July 13, 2026 Second Circuit remand (per the court’s opinion and reports).
Notable filings
- — Second Circuit opinion: vacatur and remand of expert-exclusion rulings (MDL 3043, S.D.N.Y.) [source] — The Second Circuit vacated and remanded the general-causation expert exclusions, reviving ~550 cases (per the court’s opinion and reports).
FAQ
What is the Tylenol autism lawsuit about?
Parents of children diagnosed with ASD or ADHD allege prenatal and postnatal acetaminophen (Tylenol and generics) exposure contributed to their children’s diagnoses on failure-to-warn theories (per complaints). The MDL is In re Acetaminophen — ASD-ADHD Products Liability Litigation, MDL 3043, S.D.N.Y., Judge Denise L. Cote (per JPML).
Who are the defendants?
Complaints name Johnson & Johnson (maker of Tylenol) and retail pharmacies that sold acetaminophen (per complaints and court records).
What happened with the expert exclusions and dismissals?
The district court excluded plaintiffs’ general causation experts and dismissed about 500 cases in 2023–2024 (per court orders and reports). After the Second Circuit’s July 13, 2026 remand, roughly 550 cases proceed in district court (per the court’s opinion and reports).
How many cases are in the litigation?
About 550 cases remain after the Second Circuit remand of July 13, 2026 (per the court’s opinion and reports). Earlier rounds of dismissals removed several hundred cases (per court orders).
How much will families receive?
No global settlement is on the public record as of August 2026. Following the remand, individual cases proceed in district court (per the court’s opinion and reports). No payout amount is available or can be promised.
What is the status of the science?
Causation is actively contested in the litigation: the courts have addressed the general-causation evidence case by case (per court opinions). This page reports what the record says; it does not take a side on the science.
Is there a statute of limitations?
Deadlines depend on state law, the child’s diagnosis date, and discovery rules. This is not legal advice — consult a licensed attorney about your deadline.
Think this matters to you?
This page is neutral reference material — not legal advice. If you were affected, the next step is a free case review with a licensed attorney working this matter.
Start free case review →