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Study of prenatal Tylenol exposure suggests reproductive organ changes in girls
A groundbreaking study conducted at the Copenhagen University Hospital in Denmark indicates that prenatal exposure to Tylenol (acetaminophen/paracetamol) may have reproductive impact on females. More follow-up research (including larger studies) would be required to establish clinical implications on future reproduction.
A study from Denmark published this week followed a group of pregnant women expecting female babies, and who took Tylenol (or its generic form) during pregnancy.
Early prenatal exposure was associated with "reduced ovarian... and uterine volume" while "mid-late... exposure was associated with fewer ovarian follicles."
Some of these results were seen both in infancy and in adolescence.
Similar results were seen in animal studies prior to this groundbreaking study on humans.
Researchers point out that longer follow-up and larger studies are needed to arrive at any conclusions as to the impacts of prenatal Tylenol exposure on future female fertility.
Study authors noted that theirs is "the first human study specifically designed to investigate whether prenatal paracetamol exposure is associated with markers of ovarian development in daughters."
The COPANA study, conducted from March 2020 to November 2022, enrolled 685 "healthy singleton pregnant women of Caucasian origin" in their first trimester of pregnancy. Of those, "302 infant daughters were examined at follow-up."
The study authors wrote (emphases added):
Early fetal exposure was associated with reduced ovarian volume (−0.11 cm3, 95% CI −0.19 to −0.03) and reduced uterine volume (−0.18 cm3, −0.35 to −0.01), whereas mid–late fetal exposure was associated with fewer ovarian follicles (−1.05 follicles, −1.71 to −0.39) compared to unexposed girls.
In its report on the study, CNN elaborated (emphasis added):
The study found that girls exposed to acetaminophen in the womb had, on average, 40% smaller ovarian volume, 13% smaller uterine volume and 23% fewer ovarian follicles — the structures that contain immature eggs — compared with girls whose mothers did not use acetaminophen during pregnancy. They also showed lower levels of a hormone [AMH/anti-mullerian hormone] linked to ovarian reserve.
CNN also noted that while "this study captured only a snapshot in time" and that "researchers did not follow the girls long-term to determine future fertility," the data does extend to adolescence (emphases added):
The researchers also analyzed data from 1,210 girls in the Copenhagen Mother-Child Cohort who were followed from infancy to adolescence; their mothers reported paracetamol use during the third trimester.
That data showed that fetal acetaminophen exposure was associated with smaller ovaries during adolescence and smaller uteruses at puberty.
Data beyond adolescence is absent, requiring future follow-up and larger studies.
However, prior to any studies on humans, animal studies of the drug yielded similar results. Researchers pointed out that,"[w]hile this study cannot prove that paracetamol directly caused these differences, the findings are consistent with results from animal studies."
The study authors also clarified that more research is needed to determine the implications of the results they found, writing, "Whether these early-life differences have long-term clinical relevance, including effects on reproductive lifespan, remains uncertain and requires analyses in studies with extended follow-up."
Until further research is completed, the long-term implications of prenatal Tylenol (acetaminopen/paracetamol) use on female fertility are unknown. At this time, pregnant women have few other options when they experience illness or fever serious enough to warrant medication.
Study co-author Dr. Margit Bistrup Fischer told CNN that taking the drug is ultimately "something we need as a society to talk about and inform pregnant women more about, so they can make an informed decision.”
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·Study of prenatal Tylenol exposure suggests reproductive organ changes in girls
A groundbreaking study conducted at the Copenhagen University Hospital in Denmark indicates that prenatal exposure to Tylenol (acetaminophen/paracetamol) may have reproductive impact on females. More follow-up research (including larger studies) would be required to establish clinical implications on future reproduction.
A study from Denmark published this week followed a group of pregnant women expecting female babies, and who took Tylenol (or its generic form) during pregnancy.
Early prenatal exposure was associated with "reduced ovarian... and uterine volume" while "mid-late... exposure was associated with fewer ovarian follicles."
Some of these results were seen both in infancy and in adolescence.
Similar results were seen in animal studies prior to this groundbreaking study on humans.
Researchers point out that longer follow-up and larger studies are needed to arrive at any conclusions as to the impacts of prenatal Tylenol exposure on future female fertility.
Study authors noted that theirs is "the first human study specifically designed to investigate whether prenatal paracetamol exposure is associated with markers of ovarian development in daughters."
The COPANA study, conducted from March 2020 to November 2022, enrolled 685 "healthy singleton pregnant women of Caucasian origin" in their first trimester of pregnancy. Of those, "302 infant daughters were examined at follow-up."
The study authors wrote (emphases added):
Early fetal exposure was associated with reduced ovarian volume (−0.11 cm3, 95% CI −0.19 to −0.03) and reduced uterine volume (−0.18 cm3, −0.35 to −0.01), whereas mid–late fetal exposure was associated with fewer ovarian follicles (−1.05 follicles, −1.71 to −0.39) compared to unexposed girls.
In its report on the study, CNN elaborated (emphasis added):
The study found that girls exposed to acetaminophen in the womb had, on average, 40% smaller ovarian volume, 13% smaller uterine volume and 23% fewer ovarian follicles — the structures that contain immature eggs — compared with girls whose mothers did not use acetaminophen during pregnancy. They also showed lower levels of a hormone [AMH/anti-mullerian hormone] linked to ovarian reserve.
CNN also noted that while "this study captured only a snapshot in time" and that "researchers did not follow the girls long-term to determine future fertility," the data does extend to adolescence (emphases added):
The researchers also analyzed data from 1,210 girls in the Copenhagen Mother-Child Cohort who were followed from infancy to adolescence; their mothers reported paracetamol use during the third trimester.
That data showed that fetal acetaminophen exposure was associated with smaller ovaries during adolescence and smaller uteruses at puberty.
Data beyond adolescence is absent, requiring future follow-up and larger studies.
However, prior to any studies on humans, animal studies of the drug yielded similar results. Researchers pointed out that,"[w]hile this study cannot prove that paracetamol directly caused these differences, the findings are consistent with results from animal studies."
The study authors also clarified that more research is needed to determine the implications of the results they found, writing, "Whether these early-life differences have long-term clinical relevance, including effects on reproductive lifespan, remains uncertain and requires analyses in studies with extended follow-up."
Until further research is completed, the long-term implications of prenatal Tylenol (acetaminopen/paracetamol) use on female fertility are unknown. At this time, pregnant women have few other options when they experience illness or fever serious enough to warrant medication.
Study co-author Dr. Margit Bistrup Fischer told CNN that taking the drug is ultimately "something we need as a society to talk about and inform pregnant women more about, so they can make an informed decision.”
Live Action News is pro-life news and commentary from a pro-life perspective.
Our work is possible because of our donors. Please consider giving to further our work of changing hearts and minds on issues of life and human dignity.
Contact editor@liveaction.org for questions, corrections, or if you are seeking permission to reprint any Live Action News content.
Guest Articles: To submit a guest article to Live Action News, email editor@liveaction.org with an attached Word document of 800-1000 words. Please also attach any photos relevant to your submission if applicable. If your submission is accepted for publication, you will be notified within three weeks. Guest articles are not compensated (see our Open License Agreement). Thank you for your interest in Live Action News!
Anna Hanemann
·Investigative
Bridget Sielicki
·Investigative
Carole Novielli
·Investigative
Bridget Sielicki
·Investigative
Carole Novielli
·Investigative
Bridget Sielicki
·Abortion Pill
Kelli Keane
·Investigative
Kelli Keane
·Issues
Kelli Keane
·Fact Checks
Kelli Keane
·Politics
Kelli Keane
·