Paracetamol exposure in utero or during infancy: no increase in asthma

Area of Science:

• Pediatric Allergy and Immunology
• Epidemiology
• Pharmacology

Background:

• Rising childhood asthma rates coincide with increased paracetamol (acetaminophen) exposure.
• Previous research has explored a potential association between prenatal or early-life paracetamol use and subsequent asthma development.
• Most available data focus on infant wheezing, not definitively diagnosed asthma.

Purpose of the Study:

• To evaluate the evidence linking paracetamol exposure in early life to the development of persistent childhood asthma.
• To assess the reliability of existing epidemiological studies in establishing causality.

Main Methods:

• Review and analysis of approximately 20 published epidemiological studies.
• Assessment of potential biases within these studies, particularly confounding factors related to pre-existing respiratory symptoms.

Main Results:

• Epidemiological studies are insufficient to demonstrate a causal relationship between in utero or first-year paracetamol exposure and persistent asthma.
• Significant biases, including reverse causality, limit the interpretation of current data.
• Observed associations are likely due to confounding factors rather than a direct causal effect of paracetamol.

Conclusions:

• Current evidence does not support the hypothesis that paracetamol causes persistent childhood asthma.
• The established safety profile and therapeutic benefits of paracetamol for analgesia and antipyresis in pregnancy and infancy remain unchallenged.
• Paracetamol continues to be the recommended choice for pain and fever management in these populations.