- Acetaminophen (Tylenol) is widely described by clinicians and medical groups as the pain and fever option most often suggested during pregnancy.
- In September 2025 the FDA began a process to update acetaminophen's pregnancy labeling, while stating a causal relationship with neurodevelopmental disorders has not been established.
- ACOG and other bodies emphasize that research shows an association, not proven causation, and continue to view acetaminophen as an appropriate option.
- Untreated high fever and severe pain in pregnancy carry their own risks, which is part of the balance to weigh.
- Do not start, stop, or change any medication in pregnancy on your own; decide with your OB, and MotherToBaby (1-866-626-6847) can answer exposure questions.
Few medication questions come up more often in pregnancy than this one: is Tylenol safe in pregnancy? The question took on new urgency in September 2025, when the U.S. Food and Drug Administration announced it was beginning a process to change how acetaminophen — the active ingredient in Tylenol — is labeled for use during pregnancy. If you are pregnant and in pain or running a fever, the headlines can be frightening. This article lays out what the research actually shows, what the major medical bodies say, and why the decision is one to make with your own obstetrician. It is general education, not medical advice.
Why acetaminophen comes up so often
Acetaminophen is the medication most commonly suggested for pain and fever in pregnancy. MotherToBaby, a service of the Organization of Teratology Information Specialists, notes that it is “considered by many healthcare providers and organizations to be the pain reliever and fever-reducer of choice during pregnancy.” Part of the reason is what the alternatives look like: nonsteroidal anti-inflammatory drugs such as ibuprofen and naproxen are generally avoided in later pregnancy because of specific risks to the developing baby. That is why the conversation so often lands on acetaminophen. If you want a plain-language comparison of the two, see our explainer on acetaminophen versus ibuprofen.
What the September 2025 FDA announcement said
On September 22, 2025, the FDA announced it was initiating a label change for acetaminophen products, pointing to data suggesting that prenatal exposure may be associated with an increased risk of neurodevelopmental disorders. The agency also sent a Notice to Physicians. Importantly, the FDA’s own communication acknowledged that a causal relationship has not been established and that there are contrary studies in the scientific literature. In other words, the agency described an area of ongoing scientific debate rather than a settled conclusion, and suggested clinicians be aware of it in their decision-making.
What ACOG and other groups say
The American College of Obstetricians and Gynecologists (ACOG) responded with its own guidance and struck a notably different tone. ACOG has emphasized that the existing studies show an association, not proven causation, and has been sharply critical of claims that acetaminophen use in pregnancy causes autism. ACOG and other professional bodies have continued to regard acetaminophen as an appropriate option for treating pain and fever in pregnancy when it is needed. The American Academy of Pediatrics has similarly stated that studies do not point to a causal link and that there is no single root cause of autism.
Presenting both sides plainly: the FDA has flagged a potential association and moved to update labeling, while ACOG and others stress that association is not the same as causation and that acetaminophen remains a reasonable choice. Both positions agree on one practical point — this is a decision to individualize with your clinician, not to resolve from a headline.
Untreated fever and pain carry risks too
It is easy to focus only on the medication and forget the other side of the ledger. A high fever in pregnancy is not harmless; untreated fever and severe, ongoing pain carry their own well-recognized risks. That is why clinicians weigh the potential risks of a medication against the risks of leaving a condition untreated. Bringing down a meaningful fever, for example, is a legitimate reason many clinicians still recommend acetaminophen. The goal, as MotherToBaby advises, is to use the lowest effective dose for the shortest time needed — and to check combination products so you do not unknowingly exceed the recommended daily amount. For general dosing background, see our guide on how much acetaminophen you can take, and confirm any pregnancy dosing with your OB.
The old letter categories are gone
You may remember the old FDA pregnancy “letter categories” — A, B, C, D, and X. Those categories have been retired. They were replaced by the Pregnancy and Lactation Labeling Rule (PLLR), which provides narrative summaries of the available data on risk rather than a single letter grade. So if you find an old source calling a drug “Category B,” know that the labeling system has changed, and current labels are meant to give a fuller picture that you and your clinician interpret together.
How to make the decision with your OB
The safest approach in pregnancy is never to start, stop, or change a medication on your own based on news coverage. Instead, bring the question to your obstetrician or maternal-fetal medicine specialist, who can weigh your specific situation — what you are treating, how severe it is, how far along you are, and your overall health. If you have a specific exposure question, MotherToBaby offers free, confidential information about medications and other exposures in pregnancy and breastfeeding at 1-866-626-6847. They can help you think through the evidence without alarm.
| Do | Don’t |
|---|---|
| Ask your OB before using any medication | Stop treating a high fever out of fear |
| Use the lowest effective dose for the shortest time | Assume “natural” alternatives are automatically safer |
| Check combination products for hidden acetaminophen | Switch to ibuprofen in later pregnancy on your own |
| Call MotherToBaby with exposure questions | Make decisions from a single headline |
Frequently asked questions
So is Tylenol safe to take while pregnant? Major medical groups continue to view acetaminophen as an appropriate option when needed, used at the lowest effective dose, while the FDA has flagged a possible association with neurodevelopmental disorders that is not proven. The right answer for you is an individualized one to reach with your OB.
Does Tylenol cause autism? The evidence describes an association in some studies, not established causation. The FDA itself said a causal relationship has not been established, and ACOG and the AAP emphasize there is no proven causal link.
Can I take ibuprofen instead? NSAIDs like ibuprofen are generally avoided in later pregnancy because of specific risks to the baby. Do not switch on your own; ask your clinician.
What about a fever — should I just wait it out? Untreated high fever carries its own risks in pregnancy. Treating a meaningful fever is a common reason clinicians still recommend acetaminophen. Check with your OB.
How much can I take? Use the lowest effective dose, watch for acetaminophen hidden in combination cold and flu products, and confirm the specific amount with your clinician.
Who can I call with a specific question? MotherToBaby at 1-866-626-6847 provides free, confidential answers about exposures in pregnancy and breastfeeding.
This article is general education and is not medical advice. Talk to a qualified clinician about your situation.
For more on evaluating symptoms and medications during pregnancy, see our medical conditions guide.
Sources
- MotherToBaby — acetaminophen fact sheet and helpline (1-866-626-6847)
- American College of Obstetricians and Gynecologists (ACOG) — Practice Advisory on acetaminophen use in pregnancy and neurodevelopmental outcomes (September 2025)
- U.S. Food and Drug Administration (FDA) — September 2025 announcement and Notice to Physicians on acetaminophen in pregnancy