New review weakens causal link between paracetamol in pregnancy and childhood neurodevelopmental disorders

A comprehensive umbrella review suggests that evidence does not support a direct causal relationship between prenatal paracetamol use and autism or ADHD, highlighting the importance of high-quality studies in this ongoing debate.

A new umbrella review has found that the evidence does not support a causal link between paracetamol use during pregnancy and neurodevelopmental disorders in children, including autism and attention-deficit/hyperactivity disorder. The analysis, published in Developmental Medicine & Child Neurology, pooled seven meta-analyses covering more than 3 million participants and found that any apparent association weakened markedly once the researchers focused on higher-quality studies.

The findings add weight to a growing body of work suggesting that earlier alarms may have overstated the risk. In the latest review, unrestricted analyses still showed small positive associations between prenatal paracetamol exposure and both autism and ADHD. But those effects diminished when the team restricted its assessment to studies with stronger methods, with estimates moving close to no effect at all. First author Hoda Tayebi Hillali of the University of Santiago de Compostela said the question deserved “more than headlines” and argued that stronger evidence should guide decisions in pregnancy.

The new paper sits alongside several recent reviews that reached similar conclusions. A systematic review and meta-analysis in The Lancet Obstetrics, Gynaecology, & Women’s Health found no significant link between prenatal paracetamol use and autism spectrum disorder, ADHD or intellectual disability. Another review in Environmental Health Perspectives likewise reported no significant association between prenatal acetaminophen exposure and neurodevelopmental disorders, including autism and ADHD. Earlier studies had been more mixed: some meta-analyses reported higher rates of autism or ADHD symptoms among exposed children, while others found that the signal weakened after adjustment for confounding factors.

Taken together, the research suggests that the long-running debate is being shaped less by a clear drug effect than by the limits of the available evidence. Confounding by indication , the possibility that the reason someone takes a medicine, such as fever or pain, is what drives the outcome , remains an important concern in this area. For parents and clinicians, the practical message from the newer literature is cautious rather than alarmist: current evidence does not show that paracetamol in pregnancy causes autism or ADHD, but researchers say larger, better-designed studies are still needed before the debate can be considered closed.