Paracetamol (called acetaminophen in the US) is considered safe during pregnancy and remains the recommended first-choice painkiller and fever reducer for pregnant women. Both the NHS and the American College of Obstetricians and Gynecologists (ACOG) affirm this position, though both advise using the lowest effective dose for the shortest time needed. That said, recent headlines about a new FDA label change have understandably raised concerns, so it’s worth looking at what the evidence actually shows.
What Medical Guidelines Say
The NHS lists paracetamol as the first choice of painkiller during pregnancy, stating it is “commonly taken during pregnancy and does not harm your baby.” ACOG reaffirmed in September 2025 that paracetamol remains the pain reliever and fever reducer of choice for pregnant women, adding that “no change in clinical practice is warranted” and that clinicians should “reassure patients that appropriate acetaminophen use remains the standard of care.”
That same month, the FDA initiated a label change suggesting paracetamol use during pregnancy may be associated with a higher risk of neurological conditions like autism and ADHD in children. This created a gap between what the FDA put on the label and what ACOG recommends in practice. ACOG responded directly, stating the current weight of evidence does not support a causal link between prenatal paracetamol use and neurodevelopmental disorders.
The ADHD and Autism Concerns
Several large studies over the past decade have found small statistical associations between paracetamol use in pregnancy and slightly higher rates of ADHD or autism in children. In whole-population analyses, the numbers look modestly elevated: one large study found a 7% higher rate of ADHD among children whose mothers used paracetamol, and a 5% higher rate of autism.
But here’s the critical detail: when researchers used sibling-controlled analyses, comparing a child whose mother took paracetamol during that pregnancy to a sibling whose mother didn’t, the associations essentially disappeared. In one study, the ADHD risk dropped from a 7% increase to no increase at all (hazard ratio of 0.98). Another found the ADHD association dropped from a twofold increase down to a statistically insignificant 6% increase. The same pattern held for autism, with elevated risks in the general population shrinking to nothing when siblings were compared.
An umbrella review published in the BMJ in 2025, which examined multiple systematic reviews on the topic, confirmed this pattern. Sibling analyses are important because they control for shared genetics and family environment. When the association vanishes in these more rigorous comparisons, it strongly suggests that the original link was driven by factors common within families, not by the drug itself.
Why Untreated Fever Is a Real Risk
The reason paracetamol remains recommended isn’t just because alternatives are worse. It’s because the conditions it treats, particularly fever, pose genuine dangers during pregnancy. Untreated fever in the first trimester increases the risk of miscarriage, birth defects, and premature birth. Untreated pain can contribute to maternal depression, anxiety, and high blood pressure, all of which affect fetal development. Avoiding paracetamol when you genuinely need it can create more risk than taking it.
Other Concerns: Asthma and Reproductive Effects
Beyond neurodevelopment, researchers have explored whether prenatal paracetamol exposure affects childhood respiratory health or male reproductive development. Frequent use (roughly once a month or more) has been associated with a moderately higher rate of wheezing in preschool-age children, with the link appearing stronger when paracetamol is used in mid-to-late pregnancy rather than early pregnancy. The combination of paracetamol use during pregnancy followed by use in the child’s early life appears to carry a higher association with asthma than either exposure alone.
For male reproductive development, a few cohort studies have found that paracetamol exposure during the 8-to-14-week window of pregnancy, when male reproductive organs are forming, may be associated with shorter anogenital distance, a marker of androgen activity. One study also found a link with undescended testicles. However, the evidence here is limited to a small number of studies, and one of the two studies examining anogenital distance found no significant association with paracetamol alone, only when it was combined with anti-inflammatory drugs like ibuprofen.
How to Use It Safely
The consistent advice from every major medical body is the same: use paracetamol only when you need it, at the lowest dose that works, for the shortest time possible. A 2021 international consensus statement published in Nature Reviews Endocrinology recommended that pregnant women forego paracetamol unless medically indicated and consult a pharmacist or doctor before using it on a long-term basis.
In practical terms, this means taking paracetamol for a fever or a bad headache is fine. Taking it daily for weeks on end for chronic discomfort warrants a conversation with your midwife or doctor about whether that’s the best approach. The general maximum daily dose for adults is 4,000 mg (eight standard 500 mg tablets), but most pregnant women in studies used far less than that. The goal is to treat the problem, not to take it preventively or out of habit.
Why Alternatives Are More Concerning
Part of understanding paracetamol’s safety profile is knowing what the alternatives look like. Ibuprofen and other anti-inflammatory painkillers carry well-established risks during pregnancy, including reduced amniotic fluid, kidney problems in the baby, and premature closure of a key blood vessel in the fetal heart. These drugs are specifically advised against after 20 weeks and avoided entirely in the third trimester. Aspirin at pain-relief doses carries similar concerns. This is why paracetamol has remained the default: not because it’s perfect, but because its safety profile during pregnancy is substantially better than the alternatives.