Prenatal paracetamol exposure and autism spectrum disorder: A critical review of proposed mechanisms, epidemiological evidence, and causal inference
Abstract
Autism Spectrum Disorder (ASD) is a complex neurodevelopmental condition characterized by persistent deficits in social communication and restricted, repetitive patterns of behavior. Recent claims linking prenatal exposure to paracetamol (acetaminophen), the most commonly analgesic during pregnancy, to increased risk of ASD. This review aims to critically evaluate the validity of these associations, clarify potential biological mechanisms, and provide a balanced, evidence-based perspective to inform clinical practice. Although several observational cohort studies report statistical associations between in utero paracetamol exposure and ASD, these findings are often limited by confounding. Maternal conditions necessitating pain treatment, such as infection or fever, are themselves established risk factors for adverse neurodevelopmental outcomes. Greater emphasis here is therefore placed on robust study designs, particularly sibling-comparison analyses, which account for shared genetic and environmental influences. These epidemiological studies control for unmeasured confounders and consistently demonstrate attenuation or absence of previously reported associations, suggesting that paracetamol exposure is unlikely to be causative. This review also examines proposed mechanistic pathways, including mitochondrial dysfunction and inhibition of ribonucleotide reductase, but finds insufficient evidence to support a clinically meaningful effect in humans. Given the known risks of…
Read the paper
Related studies
- Effect of dexamethasone as an analgesic adjuvant to multimodal pain treatment after total knee arthroplasty: randomised clinical trial
- Effect of a Postoperative Multimodal Opioid-Sparing Protocol vs Standard Opioid Prescribing on Postoperative Opioid Consumption After Knee or Shoulder Arthroscopy: A Randomized Clinical Trial
- Comparison of the Post-Caesarean Analgesic Effect of Adding Dexmedetomidine to Paracetamol and Ketorolac: A Randomized Clinical Trial
- A triple-blind randomized clinical trial of different associations between dexamethasone and non-steroids anti-inflammatories for preemptive action in third molar extractions
- An open label randomized clinical trial of Indomethacin for mild and moderate hospitalised Covid-19 patients
- Oral paracetamol and/or ibuprofen for treating pain after soft tissue injuries: Single centre double-blind, randomised controlled clinical trial
Go deeper in Evidence Hub
Evidence Hub adds a study data sheet (design, sample size, evidence level, key numbers), an AI summary and a chat grounded in the paper's text.