Texas Attorney General Ken Paxton is taking legal action against the producers of Tylenol, claiming the firms hid alleged dangers that the drug presented to children's brain development.
The court filing comes four weeks after President Donald Trump promoted an unproven link between using acetaminophen - alternatively called paracetamol - throughout gestation and autism in offspring.
The attorney general is filing suit against J&J, which formerly manufactured the drug, the only pain reliever suggested for women during pregnancy, and the current manufacturer, which currently produces it.
In a official comment, he claimed they "misled consumers by gaining financially from suffering and pushing pills ignoring the potential hazards."
The manufacturer says there is lacking scientific proof connecting acetaminophen to autism.
"These companies deceived for years, deliberately risking millions to line their pockets," the attorney general, from the Republican party, stated.
Kenvue commented that it was "very worried by the spread of false claims on the safety of acetaminophen and the likely effects that could have on the well-being of American women and children."
On its website, Kenvue also said it had "regularly reviewed the pertinent research and there is insufficient valid information that shows a proven link between taking paracetamol and autism."
Associations acting on behalf of physicians and healthcare providers share this view.
ACOG has stated acetaminophen - the primary component in Tylenol - is among limited choices for women during pregnancy to manage pain and elevated temperature, which can pose significant medical dangers if not addressed.
"In more than two decades of studies on the use of acetaminophen in gestation, zero credible investigations has successfully concluded that the use of acetaminophen in any stage of pregnancy results in neurological conditions in young ones," the association said.
The court filing mentions latest statements from the previous government in claiming the drug is allegedly unsafe.
Last month, Trump caused concern from medical authorities when he told expectant mothers to "fight like hell" not to use acetaminophen when unwell.
Federal regulators then issued a notice that physicians should contemplate reducing the use of Tylenol, while also declaring that "a proven link" between the medication and autism spectrum disorder in children has remains unverified.
Health Secretary Kennedy, who oversees the Food and Drug Administration, had pledged in April to undertake "a massive testing and research effort" that would determine the source of autism in a limited time.
But experts warned that identifying a unique factor of autism - believed by scientists to be the consequence of a complex mix of genetic and environmental factors - would be difficult.
Autism is a category of permanent neurological difference and condition that influences how persons experience and interact with the environment, and is identified using doctors' observations.
In his court filing, Paxton - a Trump ally who is campaigning for US Senate - asserts the manufacturer and J&J "deliberately disregarded and tried to quiet the research" around acetaminophen and autism.
The lawsuit seeks to make the firms "destroy any commercial messaging" that asserts Tylenol is safe for expectant mothers.
The court case parallels the complaints of a collection of guardians of minors with autism spectrum disorder and attention deficit hyperactivity disorder who filed suit against the makers of acetaminophen in two years ago.
The court rejected the case, declaring investigations from the family's specialists was inconclusive.
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