Emergency room prescriptions of acetaminophen for pregnant women decreased significantly in the weeks following a federal warning about potential links to autism, according to a new study published in The Lancet.

Researchers analyzed prescription data and found that orders for acetaminophen, commonly known by the brand name Tylenol, dropped among pregnant patients in emergency departments after the White House issued warnings about possible risks to fetal development.

The federal warning suggested that acetaminophen use during pregnancy might increase the risk of autism in children, prompting changes in prescribing patterns among healthcare providers treating pregnant women in emergency settings.

However, scientists emphasize that no proven causal link has been established between acetaminophen use during pregnancy and autism spectrum disorders in children. The medical consensus remains that more research is needed to determine any definitive connection.

The study highlights how public health communications can rapidly influence medical practice patterns, even when the underlying scientific evidence remains inconclusive. The decline in acetaminophen prescriptions occurred across multiple emergency departments tracked in the analysis.

Acetaminophen has long been considered one of the safer pain relief options for pregnant women, and medical professionals continue to weigh the benefits of pain management against potential but unproven risks during pregnancy.