Does Tylenol Cause Autism? - Science Vs Recap

Podcast: Science Vs

Published: 2025-09-18

Duration: 28 min

Guests: Brian Lee

Summary

The episode investigates whether taking Tylenol during pregnancy is linked to autism in children. Despite some studies suggesting a connection, the evidence remains inconclusive and further complicated by genetic and other factors.

What Happened

The episode addresses concerns circulating in the media about whether acetaminophen, commonly known as Tylenol, taken during pregnancy is linked to autism. This idea emerged from various studies over the years that suggest a possible connection between acetaminophen use during pregnancy and neurodevelopmental disorders like autism and ADHD. However, these studies present mixed results, with some indicating a link and others finding no significant association.

Meryl Horn, filling in for Wendy Zuckerman, explores the complexities of these claims by speaking to experts and examining the studies in question. Senior producer Rose Rimmler and epidemiologist Brian Lee from Drexel University contribute insights into the scientific debates surrounding this issue. Lee's research, which uses extensive data from Swedish medical records, initially found a modest link between acetaminophen use and autism but later adjusted for genetic and other factors, revealing no significant risk.

The episode dissects how earlier studies might have failed to account for variables such as a mother's age, health conditions, and genetic predispositions, which could influence both acetaminophen consumption and the likelihood of having an autistic child. By comparing siblings and controlling for these factors, Lee's study argues against a causal relationship between acetaminophen and autism.

The discussion also touches on the potential for acetaminophen to act as an endocrine disruptor, affecting sex hormones, but the evidence remains inconsistent. Even concerns about acetaminophen's impact on fetal development, such as undescended testicles, are not strongly supported by recent studies.

The episode highlights the importance of considering genetic factors in autism research, pointing out that genetic predispositions play a significant role in autism risk. The conversation suggests that acetaminophen use may be coincidentally correlated with autism due to these underlying genetic links rather than a direct cause-and-effect relationship.

In conclusion, while some studies have raised concerns about the safety of acetaminophen during pregnancy, the broader scientific consensus, including statements from entities like the FDA, does not support a direct link to autism. The episode encourages listeners to consider the complexities of scientific research and the importance of not jumping to conclusions based on incomplete evidence.

Key Insights