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Families are filing lawsuits alleging that Tylenol (acetaminophen) use during pregnancy increased the risk of autism spectrum disorder (ASD) or ADHD in children, and that manufacturers/retailers failed to provide adequate warnings. If you used acetaminophen while pregnant and your child was later diagnosed with autism or ADHD, you may qualify for compensation.
This guide explains who may qualify, key scientific evidence, litigation status, timelines, and next steps for families exploring a Tylenol autism lawsuit.
Who Qualifies for a Tylenol Autism Lawsuit?
Mother used acetaminophen (Tylenol/APAP) during pregnancy (any trimester)
Child later diagnosed with autism spectrum disorder (ASD) and/or ADHD
Diagnosis and usage details available (medical records, pharmacy logs, or reasonable proof)
Within applicable state deadlines (statutes of limitation/repose vary)
Multiple studies and reviews have reported associations between prenatal acetaminophen exposure and neurodevelopmental outcomes, including ASD and ADHD. Other experts urge caution, citing possible confounding and exposure misclassification. Courts weigh whether methods meet evidentiary standards, which differ between federal and state courts.
Cell/gene research: Recent lab work notes changes in neurodevelopment pathways after APAP exposure.
Biomarker studies: Umbilical-cord APAP biomarkers linked with higher odds of ASD/ADHD.
Systematic reviews: Mount Sinai and others report consistent association patterns in observational studies.
Tylenol Autism Litigation Timeline
2023: Federal MDL court excludes several plaintiffs’ experts on causation; defendants move for dismissal.
2024: Summary judgment effectively ends the federal MDL absent successful appeal; attention shifts to state courts.
2025: Scientific publications and policy commentary continue; state-court activity and appeals proceed.
Plaintiffs Cite Trump Administration’s Acetaminophen Warning: Plaintiffs in the Tylenol autism litigation have asked the Second Circuit to consider new federal actions on acetaminophen and pregnancy. They note that both the FDA and HHS relied on their expert, Dr. Andrea Baccarelli, when issuing pregnancy warnings and a nationwide “Dear Doctor” letter. The filing argues this supports allowing his testimony and that courts should not exclude evidence the executive branch has already endorsed.
September 26, 2025
Hearing Rescheduled in Tylenol Appeal: The Second Circuit has postponed oral arguments from October 6 to November 17 to allow the parties to review the government’s new stance on acetaminophen. Federal officials are reportedly considering additional pregnancy-related warning language.
September 25, 2025
Old Tylenol Tweet Resurfaces: HHS shared a 2017 post from Tylenol’s social media account cautioning against use during pregnancy, drawing renewed attention as regulators reexamine acetaminophen safety guidance.
September 22, 2025
Trump Links Tylenol to Autism: President Trump announced plans to warn against Tylenol use in pregnancy, suggesting a connection to autism. How this affects the pending 2nd Circuit appeal remains uncertain.
September 10, 2025
Appeal Hearing Scheduled: The 2nd Circuit will hear arguments on October 6 over whether Tylenol autism claims can proceed after the MDL judge dismissed them on scientific grounds.
September 8, 2025
Autism Report Expected Soon: FDA leadership says the government’s autism report should be released within a month, though acetaminophen may not be a central focus.
September 5, 2025
Speculation on RFK Jr. Report: News outlets report HHS may release findings linking Tylenol in pregnancy to autism, sparking a sharp drop in Kenvue’s stock price.
August 26, 2025
New Research Review: A Mt. Sinai team analyzed dozens of studies and found consistent evidence of links between prenatal acetaminophen use and conditions like autism and ADHD, raising questions about past court rulings that excluded such evidence.
February 22, 2025
Biomarker Findings Published: A Nature Mental Health study found higher ADHD risk in children whose mothers had acetaminophen biomarkers during pregnancy, with stronger effects seen in girls.
January 3, 2025
Earlier Oral Arguments: The 2nd Circuit previously heard arguments on whether expert testimony should have been excluded in the federal MDL.
September 4, 2024:
Future of Tylenol Litigation Uncertain: With federal Tylenol litigation effectively concluded by Judge Cote's summary judgment, the future of these lawsuits hangs in the balance. While some predicted a shift to state courts, as seen in the Zantac litigation, no significant movement in that direction has occurred yet. However, several pre-existing state court cases are still active:
Bartle Case (Illinois): Johnson & Johnson's motion to dismiss awaits a decision, with a status hearing set for September 30th.
Cooksey Case (Illinois): Defendants' motions to dismiss are pending, with a hearing scheduled for October 30th.
Davey Case (California): A trial date is set for April 11, 2025.
Fennewald Case (Illinois): Defendants' motions to dismiss are pending, with a hearing set for October 3rd.
Bellmon Case (Illinois): Defendants' motions to dismiss are currently under consideration.
August 22, 2024:
Federal Tylenol Litigation Concludes: Judge Cote's grant of summary judgment brings an end to the Tylenol litigation in federal court, unless plaintiffs successfully appeal the decision.
July 15, 2024
Tylenol MDL Judge Rejects New Evidence Linking Acetaminophen to ADHD: The U.S. District Judge overseeing all Tylenol ADHD and autism lawsuits has once again rejected a plaintiffs' expert witness, Dr. Roberta B. Ness. The judge ruled that Dr. Ness's opinion on causation, linking prenatal exposure to acetaminophen with ADHD in children, was unreliable and inadmissible due to methodological weaknesses and inconsistencies with scientific consensus. This ruling further weakens the plaintiffs' case in the federal court system, but does not impact lawsuits filed in state courts, which have different evidentiary standards.
May 28, 2024:
Tylenol MDL's Fate Hinges on Expert Opinion: The survival of the Tylenol MDL depends on Judge Cote's acceptance of Dr. Roberta Ness's opinion linking acetaminophen exposure during pregnancy to ADHD.
May 7, 2024:
New Expert Testimony?: The MDL was never officially dismissed and if the Tylenol Austism MDL is to proceed it will do so with new expert testimony. The court gave the defendants - Kenvue until July to file an objection to the recently proposed medical expert testimony. If the new evidence is allowed, it may help push forward the Tylenol autism MDL that was dismissed in December.
March 18, 2024:
New Tylenol ADHD Lawsuits Rely on New Evidence: Following a Daubert ruling excluding previous expert testimony, plaintiffs introduce a new expert, Dr. Roberta B. Ness, and research linking acetaminophen exposure during pregnancy to ADHD. The deadline for defendants to file a motion to exclude this new expert is set for July, with a decision expected in late summer or early fall.
March 2024:
Judge Rules Against Tylenol-Autism Link: A Manhattan federal court judge denies expert witnesses from testifying about a link between Tylenol (acetaminophen) use during pregnancy and childhood autism, effectively preventing plaintiffs from using scientific studies in their cases.
February 21, 2024:
Judge Dismisses 500 Tylenol Cases: Judge Cote issues a final judgment dismissing approximately 500 member cases in the Tylenol MDL, citing plaintiffs' failure to provide a valid reason why the cases should not be dismissed. Plaintiffs are expected to appeal the ruling.
January 18, 2024:
Plaintiffs Face Dismissal: Plaintiffs in the Tylenol MDL are required to provide a valid reason by February 1 why their cases should not be dismissed, following the issuance of Short Form Complaints (SFC) on or before January 11, 2024. This affects 501 plaintiffs who filed suit in the MDL but does not directly impact those who may have hired a lawyer but have not yet filed.
Earlier Updates (2023):
MDL dismissed?: On December 7, 2023, Judge Cote issued a 148-page ruling that rejected all five of the plaintiffs’ expert witnesses on the issue of causation. The manufacturer Kenvue announced it would seek to dismiss the federal MDL.
How the Lawsuit Process Works
Free evaluation: Answer a few questions and share prenatal usage details.
Investigation: Gather OB/pediatric records, pharmacy logs, and expert review.
Filing: If eligible, a complaint may be filed (often in state court given current posture).
Discovery & negotiation: Exchange evidence; pursue settlement where appropriate.
Resolution: Settlement, mediation, or trial depending on facts and venue.
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