If you took Advil during pregnancy and your child was later diagnosed with autism, you may find yourself looking back and wondering whether something you did could have played a role. Questions like this can be difficult to put aside—especially when there is so much conflicting information about autism causes online.

Current scientific evidence does not show that Advil (ibuprofen) causes autism. Autism is a complex neurodevelopmental condition influenced by multiple genetic and environmental factors, and researchers have not established a causal link between ibuprofen use and autism.

Current Scientific Evidence

There is no scientific evidence that ibuprofen (sold as Advil, Motrin, and generic brands) causes autism. While some studies have examined the effects of various medications during pregnancy on neurodevelopment, ibuprofen has not been identified as a cause of autism spectrum disorder. The concern about medications and autism is understandable given the rise in diagnosis rates, but ibuprofen specifically has not been implicated in any large-scale research.

Ibuprofen During Pregnancy

Ibuprofen and other NSAIDs are generally not recommended during the third trimester of pregnancy due to risks of premature closure of the ductus arteriosus in the fetus and potential kidney effects. These risks are well-documented and unrelated to autism. During the first and second trimesters, occasional use is sometimes considered acceptable under medical supervision. These recommendations are based on cardiovascular and renal effects, not neurodevelopmental concerns.

What About Other Medications?

The relationship between medication use during pregnancy and autism risk is a topic of real, ongoing research — and the picture looks very different depending on which medication you’re asking about.

• Valproic acid (Depakote): Used for epilepsy and bipolar disorder, valproic acid has a well-established association with increased autism risk when taken during pregnancy. Studies have found roughly a 2- to 3-fold increase in risk, and major guidelines recommend avoiding it during pregnancy when a safer alternative is appropriate.
• Acetaminophen (Tylenol): Prenatal acetaminophen use has received significant attention, but the strongest current evidence does not support a causal link with autism. A large 2026 review of more than 40 studies—including sibling-comparison studies designed to account for genetics and family factors—found no increased risk of autism, ADHD, or intellectual disability.
• SSRIs (antidepressants): Some studies have reported modest associations between prenatal SSRI use and autism, while more carefully controlled research suggests the underlying maternal condition may explain much of that association—rather than the medication itself.

These findings are not a reason to stop a prescribed medication during pregnancy. The risks of the medication need to be weighed against the risks of leaving conditions such as epilepsy or depression untreated—a decision that should be made with your healthcare provider.

Why People Ask This Question

The question reflects a broader pattern of concern about environmental exposures and autism risk. As autism diagnoses have increased, families naturally want to understand potential causes, which has led to scrutiny of medications, foods, chemicals, and other exposures. That concern is reasonable—but it’s important to base decisions on evidence rather than speculation. Broader diagnostic criteria, improved awareness, and better identification have contributed to the increase in autism diagnoses. 

What Does Contribute to Autism Risk

Genetic factors play a major role in autism, with heritability estimates ranging from 60 to 90 percent. Hundreds of genes have been associated with autism risk. Environmental factors that have some research support include advanced parental age, extremely premature birth, certain prenatal complications, and—as noted above—a small number of specific medications like valproic acid. The interplay between genetics and environment is complex, and no single factor has been identified as a definitive cause. 

What to Do Today 

If you’re worried about Advil use during pregnancy, there are a few practical steps you can take:

• Talk with your healthcare provider if you are currently pregnant and have questions about taking Advil or another medication.
• Never stop a prescribed medication on your own—your provider can review your situation and help you weigh the potential risks and benefits.
• If you took Advil during a previous pregnancy, don’t assume it caused your child’s autism. Current evidence does not show that ibuprofen causes autism.
• Focus on your child’s needs today by talking with their healthcare team about their strengths, challenges, and the types of support that may be helpful.

Focus on What Your Child Needs Now

If you’ve been looking for something that might explain your child’s autism, it can be difficult to know what information to trust—or what you should focus on next. While current evidence does not show that Advil causes autism, you can still take meaningful steps to understand your child’s individual strengths and challenges.

If your child has an autism diagnosis and you’re exploring ways to support their communication, independence, or everyday skills, Treetop can help you understand whether ABA therapy may be appropriate for your child and what the next steps could look like.

References

U.S. Food and Drug Administration (FDA). FDA Recommends Avoiding Use of NSAIDs in Pregnancy at 20 Weeks or Later Because They Can Result in Low Amniotic Fluid. https://www.fda.gov/drugs/drug-safety-and-availability/fda-recommends-avoiding-use-nsaids-pregnancy-20-weeks-or-later-because-they-can-result-low-amniotic

Brown HK, et al. Association Between Serotonergic Antidepressant Use During Pregnancy and Autism Spectrum Disorder in Children. JAMA. https://jamanetwork.com/journals/jama/fullarticle/2612467

Thangaratinam S, et al. Maternal Paracetamol (Acetaminophen) Use During Pregnancy and Risk of Autism Spectrum Disorder and Attention Deficit/Hyperactivity Disorder in Offspring: Umbrella Review of Systematic Reviews. The BMJ. https://www.bmj.com/content/391/bmj-2025-088141

Tick B, et al. Heritability of Autism Spectrum Disorders: A Meta-analysis of Twin Studies. Journal of Child Psychology and Psychiatry. https://pmc.ncbi.nlm.nih.gov/articles/PMC4996332/

Modabbernia A, Velthorst E, Reichenberg A. Environmental Risk Factors for Autism: An Evidence-Based Review of Systematic Reviews and Meta-Analyses. Molecular Autism. https://pmc.ncbi.nlm.nih.gov/articles/PMC5356236/