Major Study Finds No Link Between Tylenol Use During Pregnancy and Autism

The Research

Researchers from Italy, the United Kingdom, Sweden, and Norway conducted a systematic review of 43 studies examining associations between maternal paracetamol use and neurodevelopmental disorders. The team pooled data from 17 high quality studies involving more than 300,000 pregnancy records.

The analysis found odds ratios of 1.03 for autism, 0.97 for ADHD, and 1.11 for intellectual disability. None of these results were statistically significant, meaning the slight variations could easily be attributed to chance rather than any causal relationship.

Dr. Asma Khalil, the study's lead author and professor of obstetrics and maternal fetal medicine at St. George's Hospital, University of London, stated clearly that the research found no clinically significant increase in the risk of autism, ADHD, or intellectual disabilities. She emphasized that paracetamol remains a safe option during pregnancy when taken as guided by medical professionals.

Methodology and Significance

The study prioritized sibling comparison research, which examines outcomes when a mother used paracetamol during one pregnancy but not another. This approach helps control for shared genetics and family environment, making it one of the most rigorous methods for studying potential causal relationships.

All sibling studies examined showed no increased risk, providing strong evidence against any link between paracetamol use and neurodevelopmental disorders. Independent scientists have praised the study's methodology, with Dr. Céline Gounder, CBS News medical contributor, calling the analysis as definitive as we're going to get.

Political Context

In September 2025, President Trump urged pregnant women to fight like hell not to take Tylenol, citing a possible link to autism. Following these claims, the FDA issued guidance instructing physicians to consider limiting paracetamol use during pregnancy.

Medical organizations immediately pushed back against these claims. The American College of Obstetricians and Gynecologists reaffirmed that paracetamol is a safe, effective option for managing pain and fever during pregnancy. The American Academy of Pediatrics called the administration's claims misleading and dangerous.

In response to the new study, the Department of Health and Human Services said it did not refute concerns raised by other researchers, citing Dr. Andrea Baccarelli, dean of the Harvard T.H. Chan School of Public Health.

Clinical Implications

Paracetamol remains the only medication approved for treating fever and pain during pregnancy. Approximately 65 percent of pregnant women use it at some point during their pregnancy. Other pain relievers, including ibuprofen and aspirin, carry documented risks to the fetus.

Hugh Taylor, chief of Obstetrics and Gynecology at Yale New Haven Hospital, said the findings should reassure pregnant women. He noted that Tylenol is the safest thing available to treat some serious conditions in pregnancy and that the alternatives have more risk. Taylor confirmed he would not be changing what he tells his patients based on the new evidence.

Kenvue, the maker of Tylenol, issued a statement saying that independent, sound science clearly shows that taking paracetamol does not cause autism.

The study provides crucial evidence for healthcare providers and pregnant women navigating pain and fever management during pregnancy, reinforcing existing medical guidance that paracetamol is safe when used as directed.