Vancouver, Sep 16 (The Conversation) Over the past couple of months, headlines have warned expectant parents that something as ordinary as a pain reliever or an antidepressant taken during pregnancy could \u201ccause autism.\u201d
\u00a0\u00a0\u00a0\u00a0The stories have focused on acetaminophen (also known as paracetamol or the brand name Tylenol) and selective serotonin reuptake inhibitors (SSRIs), such as Prozac (fluoxetine) and Zoloft (sertraline).
\u00a0\u00a0\u00a0\u00a0But here is what the headlines leave out: acetaminophen is commonly used during pregnancy to manage fever, pain or stress, all of which can themselves affect fetal development. Similarly, SSRIs are prescribed for depression or anxiety, conditions that also influence pregnancy outcomes. In many cases, it may well be the illness, not the treatment, that shapes child development.
\u00a0\u00a0\u00a0\u00a0Both classes of medications have been studied extensively for decades. Yet despite what the headlines suggest, the evidence that acetaminophen or SSRIs cause autism is weak, inconsistent and easily misinterpreted.
\u00a0\u00a0\u00a0\u00a0With a background in genetics and clinical teratology \u2014 the scientific study of birth defects \u2014 my research examines how maternal exposures in pregnancy interact with genetic and environmental factors to influence child development. \u00a0\u00a0\u00a0\u00a0From this perspective, I want to explain why the research on acetaminophen and SSRIs is often misunderstood, and why reducing complex science to alarming headlines does more harm than good.
\u00a0\u00a0\u00a0\u00a0With the recent US Food and Drug Administration (FDA) panel on SSRIs in pregnancy, and the public claims made by United States Secretary of Health and Human Services Robert F. Kennedy Jr. regarding acetaminophen and autism, there is a need for evidence-based information. While my focus will be on autism, the same issues apply to media coverage linking pregnancy exposures to attention deficit\/hyperactivity disorder (ADHD).<\/p>\n
\u00a0\u00a0\u00a0\u00a0Association is not causation<\/p>\n
\u00a0\u00a0\u00a0\u00a0 Much of the research behind these headlines is observational. Such studies can spot associations but cannot prove cause and effect. The associations they identify are usually small to modest, and other factors are often responsible.
\u00a0\u00a0\u00a0\u00a0Confounding is a good example. Pregnant women may take acetaminophen because they have a fever, but fever itself has been linked to higher risks of neurodevelopmental outcomes such as neural tube defects. Similarly, someone prescribed SSRIs may be experiencing depression or anxiety, which on their own are associated with differences in pregnancy outcomes and child development. Here, the medication may appear to be the cause, when in reality it is the condition being treated.
\u00a0\u00a0\u00a0\u00a0 Another problem is misclassification.Most studies rely on mothers recalling how often they used acetaminophen during pregnancy. Memory is imperfect: some under-report, others over-report, and details about dose or timing are often missing.
\u00a0\u00a0\u00a0\u00a0With SSRIs, misclassification can arise when prescriptions are used as a proxy for exposure. A woman may fill a prescription in early pregnancy but stop taking the medication later, while records still count her as continuously exposed. Both scenarios distort results.
\u00a0\u00a0\u00a0\u00a0Even the outcomes themselves are not always measured consistently. Diagnoses like autism spectrum disorder vary across countries and over time. Some studies use parental questionnaires instead of medical diagnoses, which can be subjective. Two children with the same traits might be classified differently depending on who reports them.
\u00a0\u00a0\u00a0\u00a0When researchers adjust for these kinds of factors, the apparent risks often shrink or even disappear.<\/p>\n
\u00a0\u00a0\u00a0\u00a0Research shortcomings and media spin
\u00a0\u00a0\u00a0\u00a0
\u00a0\u00a0\u00a0\u00a0 Beyond these challenges, research in this area has other limitations: timing and dose are often recorded crudely; use of other medications taken at the same time is not systematically assessed; results are inconsistently replicated; and while biobank and biomarker studies \u2014 which analyze measurable biological signals, such as blood levels of a substance, to indicate exposure \u2014 hold promise, they are uncommon and usually capture exposure only once.
\u00a0\u00a0\u00a0\u00a0Furthermore, studies that report positive associations are more likely to be published, and once they are, news outlets are far more likely to amplify findings that sound alarming than ones that reassure. \u201cEveryday painkiller linked to autism\u201d makes a clickable headline; while a more balanced one that might read something like \u201cEvidence inconsistent, no strong effect found\u201d does not.
\u00a0\u00a0\u00a0\u00a0This cycle amplifies fear, leaving parents confused and anxious.<\/p>\n
\u00a0\u00a0\u00a0\u00a0The real dangers of untreated conditions<\/p>\n
\u00a0\u00a0\u00a0\u00a0 It also matters what happens when pain, fever, depression or anxiety go untreated.
\u00a0\u00a0\u00a0\u00a0High fever in pregnancy is known to increase the risk of neural tube defects and other complications. Untreated maternal depression and anxiety can lead to poor prenatal care, substance use, preeclampsia, premature birth, impaired bonding and even suicide \u2014 one of the leading causes of maternal death.
\u00a0\u00a0\u00a0\u00a0In these cases, acetaminophen and SSRIs are not just helpful. They can be lifesaving.
\u00a0\u00a0\u00a0\u00a0
\u00a0\u00a0\u00a0\u00a0 Understanding autism<\/p>\n
\u00a0\u00a0\u00a0\u00a0 Autism is not caused by a single medication or choice. It is a complex neurodevelopmental difference with a strong genetic basis. Heritability estimates are around 70\u201380 per cent, meaning much of the variation in risk is tied to parental traits and shared family environments.
\u00a0\u00a0\u00a0\u00a0Autism also clearly runs in families: siblings of autistic individuals are 10 to 20 times more likely to be diagnosed, and many parents or relatives show autistic traits even without formal diagnoses. This familial pattern reinforces that genetics and shared environment play a major role.
\u00a0\u00a0\u00a0\u00a0Sibling studies add weight by comparing siblings where one was exposed to a medication in pregnancy, and the other was not.
\u00a0\u00a0\u00a0\u00a0If the medication were truly causing autism, clear differences would appear. But often they shrink or disappear, pointing instead to shared genetics and environment.
\u00a0\u00a0\u00a0\u00a0Of course, environmental factors can still play a role. But to suggest that a common medication like acetaminophen \u201ccauses\u201d autism oversimplifies the picture and risks stigmatizing families, while fuelling guilt among mothers who already face intense scrutiny during pregnancy.<\/p>\n
\u00a0\u00a0\u00a0\u00a0Communicating risk responsibly<\/p>\n
\u00a0\u00a0\u00a0\u00a0 One of the greatest challenges is not the research itself, but how its results are communicated. Studies often report risks using relative measures. For example, a study might report that acetaminophen use is associated with a 30 per cent increase in autism risk. That sounds alarming. But in absolute terms, the difference is much smaller.
\u00a0\u00a0\u00a0\u00a0Autism affects about three in every 100 children. Even taking the highest reported increase in studies \u2014 a 30 per cent relative rise \u2014 that number only goes up to about four in 100. In other words, instead of 97 children without autism, you\u2019d have 96. So while the increase is real, the absolute change in risk remains small.
\u00a0\u00a0\u00a0\u00a0Therefore, balanced communication matters. When parents hear only the alarming side, some may stop taking needed medications abruptly, which can be dangerous. Others may endure untreated illness out of fear. Clinicians and researchers should emphasize absolute risks, acknowledge limits, and aim to inform, not frighten.<\/p>\n
\u00a0\u00a0\u00a0\u00a0Informed, not alarmed<\/p>\n
\u00a0\u00a0\u00a0\u00a0 The lesson isn\u2019t that acetaminophen or SSRIs are risk-free. No medication is. But decades of research show that, when clinically indicated, they are generally safe in pregnancy. The risks of untreated illness are often greater.
\u00a0\u00a0\u00a0\u00a0Autism is a condition caused by many factors, including genetics, not something to blame on common medications \u2014 or mothers.
\u00a0\u00a0\u00a0\u00a0Expectant parents deserve clear, compassionate, evidence-based information, not fear-driven headlines. Association is not causation, absolute risks are small, and informed choice should never be replaced by alarm. (The Conversation) RD
RD<\/p>\n","protected":false},"excerpt":{"rendered":"Vancouver, Sep 16 (The Conversation) Over the past couple of months, headlines have warned expectant parents that something…\n","protected":false},"author":2,"featured_media":64912,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[916,90,56,54,55],"class_list":["post-143390","post","type-post","status-publish","format-standard","has-post-thumbnail","category-genetics","tag-genetics","tag-science","tag-uk","tag-united-kingdom","tag-unitedkingdom"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/posts\/143390","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/comments?post=143390"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/posts\/143390\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/media\/64912"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/media?parent=143390"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/categories?post=143390"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/tags?post=143390"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}