Paracetamol Use in Pregnancy Explained: What the New Lancet Study Says About Autism and ADHD Risk
A major new scientific review has found no evidence that taking paracetamol during pregnancy increases the risk of autism, attention-deficit hyperactivity disorder (ADHD), or intellectual disability in children. Published in “The Lancet Obstetrics, Gynaecology and Women’s Health”, the study directly addresses confusion triggered by comments made last year by US President “Donald Trump”, who had suggested a link between prenatal paracetamol use and autism. Led by researchers from “City St George’s, University of London”, the review is being described as the most rigorous analysis of the evidence so far, drawing on data from 43 studies and hundreds of thousands of children.
Why This Question Matters for Pregnant Women
Paracetamol — also known as acetaminophen — is the most commonly recommended painkiller and fever-reducing drug during pregnancy across the world. Unlike non-steroidal anti-inflammatory drugs (NSAIDs) or opioids, it has long been considered safer for both the mother and the foetus. However, over the past decade, some observational studies had reported small associations between paracetamol exposure in pregnancy and neurodevelopmental conditions such as autism or ADHD. These findings, amplified on social media, created anxiety among expectant mothers and even led some to avoid treating fever or pain — conditions that themselves can pose risks during pregnancy.
Paracetamol — also known as acetaminophen — is the most commonly recommended painkiller and fever-reducing drug during pregnancy across the world. Unlike non-steroidal anti-inflammatory drugs (NSAIDs) or opioids, it has long been considered safer for both the mother and the foetus. However, over the past decade, some observational studies had reported small associations between paracetamol exposure in pregnancy and neurodevelopmental conditions such as autism or ADHD. These findings, amplified on social media, created anxiety among expectant mothers and even led some to avoid treating fever or pain — conditions that themselves can pose risks during pregnancy.
What the New Lancet Study Did Differently
The latest review stands out for its methodological rigour. Researchers assessed all studies using the Quality In Prognosis Studies (QUIPS) tool, which evaluates the risk of bias in medical research.
Crucially, the team pooled results from “sibling comparison” studies — a design considered close to a gold standard in observational research. These studies compare siblings born to the same mother, where one pregnancy involved paracetamol exposure and another did not. This approach helps control for shared genetics, family environment and long-term parental characteristics that traditional studies often fail to isolate.
Across these sibling-comparison studies, the researchers analysed data on:
The latest review stands out for its methodological rigour. Researchers assessed all studies using the Quality In Prognosis Studies (QUIPS) tool, which evaluates the risk of bias in medical research.
Crucially, the team pooled results from “sibling comparison” studies — a design considered close to a gold standard in observational research. These studies compare siblings born to the same mother, where one pregnancy involved paracetamol exposure and another did not. This approach helps control for shared genetics, family environment and long-term parental characteristics that traditional studies often fail to isolate.
Across these sibling-comparison studies, the researchers analysed data on:
262,852 children assessed for autism
335,255 for ADHD
406,681 for intellectual disability
The conclusion was clear: paracetamol use during pregnancy was not associated with an increased risk of any of these outcomes.
406,681 for intellectual disability
The conclusion was clear: paracetamol use during pregnancy was not associated with an increased risk of any of these outcomes.
What Explains Earlier Alarmist Findings?
According to Prof “Asma Khalil”, who led the study, earlier reported links are likely explained by confounding factors rather than the drug itself. “These associations are more plausibly due to genetic predisposition or maternal factors such as fever, infection, or underlying pain,” she noted, rather than a direct biological effect of paracetamol on the developing brain. In other words, it may not have been the medication, but the condition for which it was taken, that was associated with later neurodevelopmental diagnoses.
According to Prof “Asma Khalil”, who led the study, earlier reported links are likely explained by confounding factors rather than the drug itself. “These associations are more plausibly due to genetic predisposition or maternal factors such as fever, infection, or underlying pain,” she noted, rather than a direct biological effect of paracetamol on the developing brain. In other words, it may not have been the medication, but the condition for which it was taken, that was associated with later neurodevelopmental diagnoses.
Why Avoiding Paracetamol Can Be Risky
Researchers also warn that avoiding paracetamol altogether may unintentionally cause harm. Untreated high fever during pregnancy, for instance, is known to increase risks for both the mother and the foetus. Paracetamol remains the first-line treatment recommended by doctors precisely because of its safety profile when taken at appropriate doses.
Researchers also warn that avoiding paracetamol altogether may unintentionally cause harm. Untreated high fever during pregnancy, for instance, is known to increase risks for both the mother and the foetus. Paracetamol remains the first-line treatment recommended by doctors precisely because of its safety profile when taken at appropriate doses.
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