The top legal official in Texas Ken Paxton is suing the producers of acetaminophen, asserting the companies hid alleged dangers that the pain reliever presented to pediatric brain development.
The lawsuit follows four weeks after Donald Trump publicized an unverified association between using acetaminophen - referred to as acetaminophen - throughout gestation and autism spectrum disorder in children.
The attorney general is taking legal action against the pharmaceutical giant, which once produced the medication, the exclusive pain medication recommended for expectant mothers, and the current manufacturer, which presently makes it.
In a declaration, he claimed they "deceived the public by profiting off of pain and promoting medication without regard for the dangers."
The manufacturer says there is no credible evidence tying acetaminophen to autism spectrum disorder.
"These corporations misled for generations, intentionally threatening countless individuals to boost earnings," Paxton, from the Republican party, said.
The manufacturer commented that it was "deeply concerned by the perpetuation of misinformation on the security of paracetamol and the possible consequences that could have on the well-being of US mothers and children."
On its official site, the company also stated it had "regularly reviewed the applicable studies and there is no credible data that shows a proven link between consuming acetaminophen and autism spectrum disorder."
Organizations representing physicians and healthcare providers concur.
The American College of Obstetricians and Gynecologists has said paracetamol - the main ingredient in Tylenol - is one of the few options for expectant mothers to address discomfort and fever, which can create serious health risks if not addressed.
"In more than two decades of research on the utilization of acetaminophen in pregnancy, not a single reputable study has definitively established that the usage of paracetamol in any stage of pregnancy results in neurodevelopmental disorders in offspring," the organization said.
The lawsuit mentions latest statements from the former administration in arguing the medication is reportedly hazardous.
Last month, the former president raised alarms from public health officials when he told expectant mothers to "fight like hell" not to use Tylenol when unwell.
Federal regulators then issued a notice that doctors should think about restricting the usage of Tylenol, while also mentioning that "a proven link" between the drug and autism in children has not been established.
The Health Department head RFK Jr, who oversees the FDA, had promised in spring to undertake "comprehensive study program" that would establish the origin of autism spectrum disorder in a limited time.
But experts cautioned that finding a sole reason of autism - believed by scientists to be the outcome of a complex mix of genetic and surrounding conditions - would be difficult.
Autism spectrum disorder is a category of permanent neurological difference and disability that affects how persons encounter and engage with the world, and is diagnosed using doctors' observations.
In his court filing, Paxton - who supports Trump who is seeking US Senate - claims Kenvue and Johnson & Johnson "deliberately disregarded and attempted to silence the research" around paracetamol and autism.
This legal action attempts to require the corporations "eliminate any marketing or advertising" that states acetaminophen is reliable for women during pregnancy.
This legal action parallels the concerns of a collection of guardians of children with autism spectrum disorder and ADHD who sued the manufacturers of acetaminophen in two years ago.
Judicial authorities threw out the case, saying research from the parents' expert witnesses was not conclusive.
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