Acetaminophen—the active ingredient in Tylenol and dozens of store-brand pain relievers—is the most commonly used over-the-counter medication during pregnancy. For years, it was considered one of the only safe options for managing pain and fever while pregnant. But a growing body of scientific research now links prenatal acetaminophen exposure to an increased risk of autism spectrum disorder and attention deficit hyperactivity disorder in children. For families navigating these diagnoses, this connection raises urgent questions about what the manufacturers knew and when they knew it.

What the Research Shows

Multiple peer-reviewed studies have identified a statistical association between acetaminophen use during pregnancy and neurodevelopmental disorders in children. Research from Mount Sinai, published in August 2025, applied rigorous methodology and found a meaningful link between prenatal exposure and increased rates of autism spectrum disorder and ADHD.

The scientific basis for this connection lies in how acetaminophen interacts with fetal brain development. The drug can cross the placental barrier and may disrupt hormonal processes critical to neurological development. While the research continues to evolve, the evidence has become substantial enough that the FDA announced it would begin the process of adding pregnancy-specific warnings to all acetaminophen products. In September 2025, federal health authorities issued guidance advising against acetaminophen use during pregnancy when possible.

The Impact on Families

A diagnosis of autism spectrum disorder or ADHD changes the trajectory of a child’s life and the lives of everyone in the family. Children with ASD may require lifelong support including specialized therapy, behavioral interventions, educational accommodations, and in many cases, assisted living arrangements into adulthood. ADHD brings its own challenges: difficulty in school, social struggles, and the need for ongoing medical management.

For parents who took acetaminophen during pregnancy because they were told it was safe—and who now wonder whether that decision contributed to their child’s diagnosis—the emotional weight is enormous. These families deserve answers, and they deserve to know whether the companies that manufactured and sold these products failed in their duty to warn.

Who May Be Eligible

Families may be eligible to pursue a claim if the mother used acetaminophen during pregnancy and the child was subsequently diagnosed with autism spectrum disorder or ADHD. Both brand-name Tylenol and generic acetaminophen products are included in the litigation. The key factors in evaluating a claim are the duration and frequency of use during pregnancy and the child’s clinical diagnosis.

Current Status of the Litigation

Over 500 lawsuits have been filed alleging that acetaminophen manufacturers failed to warn about the risks of prenatal use. An initial dismissal in December 2023 found insufficient scientific evidence at that time, but that ruling is currently on appeal to the Second Circuit Court of Appeals. The regulatory landscape has shifted significantly since the dismissal—the FDA is now processing pregnancy warning labels, and federal health officials have acknowledged the association. These developments may substantially affect the course of the litigation.

If your child was diagnosed with autism or ADHD and you used acetaminophen during pregnancy, you may have legal options worth exploring. Beverly Wilshire Law APC can review your situation at no cost and help you understand whether a claim is appropriate for your family. Call (310) 424-5566 or visit bevwilshire.com—we’re here to guide you in the right direction.