Tylenol in Pregnancy and Autism and ADHD
Tayebi-Hillali H et al., 2026, Developmental Medicine & Child Neurology
DOI 10.1111/dmcn.70512
Umbrella review and meta-meta-analysis, 7 meta-analyses covering more than 3 million participants
Summary: Whether taking acetaminophen (Tylenol) in pregnancy raises the risk of autism or ADHD is a question many families bring to feedback sessions, often with guilt attached. Instead of pooling individual studies again, this team pooled seven existing meta-analyses: three covered autism and all seven covered ADHD. Across all the evidence, they found small associations, about 17% higher risk for autism and 29% for ADHD. When they limited the analysis to the highest-quality review and the studies least prone to bias, the autism link was close to zero (about 5% in the lowest-bias studies). The ADHD link shrank to about 16–17%, and results varied a lot between those studies. The authors read this pattern of a signal that fades as study quality goes up as evidence against a causal link. The review couldn't examine dose, timing during pregnancy, or how long the medication was used. It also didn't formally test for publication bias, and its results can be skewed when the same original studies appear in more than one meta-analysis.
Takeaways for clinicians
A signal that weakens as study quality improves usually points to confounding, such as the fever, infection, or pain that led to taking the medication, shared family and genetic risk, or imprecise self-reported use.
In the strongest evidence, the autism association is essentially null. The ADHD association is smaller but not clearly zero, and it varied between studies.
Gives a current, high-level summary to refer to when parents ask whether they caused their child's diagnosis.
Takeaways for families
The better-designed studies find little to no link between acetaminophen in pregnancy and autism. Any link with ADHD is small and uncertain.
This research does not show that acetaminophen causes autism or ADHD.
The researchers note it's still considered an appropriate pain and fever option in pregnancy when needed. Discuss questions about medications during pregnancy with a doctor.
