Why did the misinformation spread so far?

The study points to TikTok's recommendation algorithm as a key factor. "Our results indicate that TikTok's algorithm amplified low-quality, conspiracy-framed videos containing misinformation on a very sensitive health topic and allowed for misinformation videos to spread far wider than evidence-based videos that explained the lack of evidence of a causal link between prenatal acetaminophen exposure and autism," Srivastava said.

In plain terms: videos claiming a causal link between the common painkiller and autism reached far more people than videos explaining that no solid evidence supports such a link. The mechanism is the platform's engagement-driven ranking, which gave conspiracy-framed content a visibility advantage over evidence-based explanations on the same topic.

The timing amplified the effect. The FDA's Sept. 22, 2025 announcement prompted a surge of searches from worried parents and pregnant patients. When accurate institutional content was scarce or less engaging, the algorithm filled the demand with influencer videos making stronger, simpler — and unsupported — claims.

How did the study come about?

The project started in the clinic, not the lab. "After seeing pregnant patients in our own clinics question whether it was safe to take Tylenol during pregnancy, we wanted to understand what information they were being exposed to online," Srivastava said.

That clinical observation led the team to systematically catalog and classify TikTok content posted in the wake of the FDA announcement, separating evidence-consistent videos from misinformation and tracking how many views each category received.

What are the study's limitations?

The findings come from an abstract presented at a conference, meaning the work has not yet undergone the full peer-review process of a published journal article. The sample is also narrow: 53 videos posted over roughly three months on a single platform, covering one health topic after one specific regulatory announcement. The results may not generalize to other platforms, other topics, or longer time windows.

The study also measures exposure, not outcomes. It shows that misinformation dominated views, but it does not directly test whether viewers changed their medication behavior as a result.

What should doctors and patients take from it?

The researchers argue that as more people turn to social media — especially TikTok — for medical advice, pediatricians need to proactively address misinformation with patients and their families rather than waiting for questions to arrive at the clinic.

"Our findings reveal how important it is for medical institutions to be part of the conversations on social media by sharing accurate, engaging content that reaches patients where they are," Srivastava said.

The practical implication is twofold. Clinicians should expect patients to arrive with beliefs shaped by viral videos, and they should be prepared to discuss the actual evidence on prenatal acetaminophen use. Medical institutions, meanwhile, may need to meet patients on the platforms where the misinformation is spreading — with content accurate enough to trust and engaging enough to compete.