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Paracetamol and Autism Claims: Science Beyond Fear (BMJ 2025 Findings)
Does paracetamol use during pregnancy increase the risk of autism? The BMJ 2025 analysis, which evaluated results from more than 40 studies, provides a scientific response to these claims. Paracetamol remains safe for appropriate use when treating pain or fever.
How Did the “Paracetamol Causes Autism” Claims Begin?
In recent months, several lawsuits in the United States and related media coverage have suggested that maternal paracetamol (Tylenol) use during pregnancy may increase the risk of autism or attention deficit hyperactivity disorder (ADHD) in children.
These claims created a fear-based narrative rather than one grounded in scientific evidence, causing concern among expectant mothers.
However, a comprehensive analysis published in the BMJ in November 2025 revealed that there is no reliable evidence supporting these allegations.
What Does the BMJ 2025 Analysis Show?
The analysis reviewed nine previous systematic reviews and more than 40 studies.
Key findings were clear:
- No direct association was found between paracetamol use during pregnancy and autism or ADHD.
- Most earlier studies did not sufficiently control for familial, genetic, or environmental factors.
- After accounting for these variables, the perceived risk disappeared.
Especially in sibling-comparison analyses—where children born to the same mother in different pregnancies were compared—no increased risk was detected.
The Real Reasons for the Increase in Autism Diagnoses
The number of children diagnosed with autism has risen significantly worldwide over the last 20 years. But this increase is not due to medications—it is driven by diagnostic evolution and greater awareness.
Main factors include:
- Expanded diagnostic criteria after DSM-5
- Greater awareness among families and healthcare providers
- More widespread early diagnostic centers and screening tests
- Advancements in genetic testing
- Digitalization of health record systems
In other words, the rise in autism diagnoses reflects a diagnostic transformation, not a biological epidemic.
Why Is Paracetamol Used During Pregnancy?
Paracetamol is the most widely recommended and safely used analgesic during pregnancy worldwide.
Common indications include:
- Fever
- Headache, muscle pain, or joint pain
- Common cold symptoms
- Intrauterine infections (e.g., chorioamnionitis)
- Pain or fever due to viral illnesses
Avoiding paracetamol in these situations—especially leaving high fever untreated—may pose far more serious risks for both the mother and the baby.
High fever is associated with preterm birth, fetal stress, and congenital anomalies.
The Role of Familial and Genetic Factors
Autism and ADHD are neurodevelopmental conditions with strong familial and genetic components.
In the sibling-comparison studies included in the BMJ 2025 analysis, children from pregnancies where the mother used and did not use paracetamol were compared.
Conclusion:
There is no risk attributable to the medication itself.
Observed differences are most likely explained by shared genetic and environmental factors.
What Do Global Health Authorities Say?
Major regulatory bodies align on this issue:
- UK MHRA (Medicines and Healthcare products Regulatory Agency)
- European EMA (European Medicines Agency)
- Australian TGA (Therapeutic Goods Administration)
All emphasize that short-term, appropriate-dose paracetamol use during pregnancy is safe when medically needed.
Conclusion: The Science Is Clear
- Paracetamol can be safely used during pregnancy for pain or fever.
- Scientific evidence does not show an increased risk of autism or ADHD.
- What is dangerous is not the medication—but leaving conditions like fever untreated.
Recommendation
Paracetamol should be used only when necessary, at the lowest effective dose, and for the shortest duration.
When in doubt, always consult a physician.
References
- BMJ 2025;391:e088141 – “Maternal paracetamol use during pregnancy and risk of autism spectrum disorder and ADHD in offspring”
- MHRA, EMA, TGA official statements (2025)
- WHO Maternal Health Guidelines
