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Acetaminophen and asthma
A John Henderson1, Seif O Shaheen
1School of Social and Community Medicine, University of Bristol, UK. a.j.henderson@bris.ac.uk
Insights
Acetaminophen use in pregnancy and infancy is linked to childhood asthma. More research, including randomized trials, is needed to confirm this association and guide interventions for at-risk children.
Area of Science:
- Pediatric medicine
- Epidemiology
- Pharmacology
Background:
- Acetaminophen is a common pain and fever reliever for children and pregnant women.
- Epidemiological studies consistently link acetaminophen use to asthma symptoms in children.
- Evidence suggests a connection between prenatal/infant acetaminophen exposure and later childhood asthma, even after accounting for confounders.
Purpose of the Study:
- To review the evidence linking acetaminophen use to asthma.
- To highlight the need for causal inference through randomized trials.
- To inform the development of interventions for children at risk of asthma.
Main Methods:
- Review of epidemiological studies on acetaminophen use and asthma.
- Analysis of confounding factors and dose-response relationships.
- Identification of research gaps and recommendations for future studies.
Main Results:
- Substantial epidemiological evidence supports an association between acetaminophen use and asthma.
- The association appears robust to confounders and may be dose-dependent.
- Confounding by indication remains a consideration, but evidence is compelling.
Conclusions:
- The epidemiological data strongly suggests a link between acetaminophen and childhood asthma.
- Establishing causation through randomized controlled trials is crucial.
- Further research is needed to develop targeted interventions for children at risk.
Abstract:
Acetaminophen is a widely used medication for the treatment of pain and fever in children and pregnant women. There is substantial epidemiological evidence in adults and children that acetaminophen use is associated with asthma symptoms. There is also a considerable body of evidence that supports a modest but consistent association of acetaminophen use in pregnancy and early infancy with asthma in later childhood. This relationship is robust to adjustment for a large range of potential confounding factors and, in some studies, shows clear evidence of a dose-dependent association but the possibility of confounding by indication has remained a concern. However, the epidemiological evidence is now compelling and there is a clear need to establish causation so that appropriate advice and interventions can be developed for children at risk of asthma. This requires randomised trials of analgesics and antipyretics, including acetaminophen, in a variety of clinical settings.
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