California, Massachusetts, New York and New Jersey petitioned the U.S. Food and Drug Administration on Thursday to ease its new restrictions on the abortion pill mifepristone, citing the drug's proven safety record and arguing the new limits are unnecessary.

"The medication is a lifeline for millions of women who need access to time-sensitive, critical health care — especially low-income women and those who live in rural and underserved areas," California Attorney General Rob Bonta said as the attorneys general of the four states filed the petition.

The petition cites Senate testimony by Health and Human Services Secretary Robert F. Kennedy Jr. last month, in which Kennedy said he had ordered FDA Administrator Martin Makary to conduct a "complete review" of mifepristone and its labeling requirements.

The drug, which can be received by mail, has been on the U.S. market for 25 years and taken safely by millions of Americans, according to experts. It is the most common method of terminating a pregnancy in the U.S., with its use surging after the Supreme Court overturned Roe vs. Wade in 2022.

The Supreme Court upheld access to the drug for early pregnancies under previous FDA regulations last year, but it has remained a target of anti-abortion conservatives. The Trump administration has given Kennedy broad rein to shake up American medicine under his "Make America Healthy Again" banner, and Kennedy has swiftly rankled medical experts by using dubious science — and even fake citations — to question vaccine regimens and research and other longstanding public health measures.

At the Senate hearing, Kennedy cited "new data" from a flawed report pushed by anti-abortion groups — and not published in any peer-reviewed journal — to question the safety of mifepristone, calling the report "alarming."

"Clearly, it indicates that, at very least, the label should be changed," Kennedy said.

Sen. Josh Hawley, R-Mo., on Monday posted a letter from Makary to X, in which Makary wrote that he was "committed to conducting a review of mifepristone" alongside "the professional career scientists" at the FDA.

Makary said he could not provide additional information given ongoing litigation around the drug.

The states, in their 54-page petition, wrote that "no new scientific data has emerged since the FDA's last regulatory actions that would alter the conclusion that mifepristone remains exceptionally safe and effective," and that studies "that have frequently been cited to undermine mifepristone's extensive safety record have been widely criticized, retracted, or both."

Democrats have derided Kennedy's efforts to reclassify mifepristone as politically motivated and baseless.

"This is yet another attack on women's reproductive freedom and scientifically reviewed health care," Gov. Gavin Newsom said the day after Kennedy's Senate testimony. "California will continue to protect every person's right to make their own medical decisions and help ensure that Mifepristone is available to those who need it."

Bonta said Thursday that mifepristone's placement under the FDA's Risk Evaluation and Mitigation Strategy program for drugs with known, serious side effects — or REMS — was "medically unjustified," unduly burdened patient access and placed "undue strain on the nation's entire health system."

He said mifepristone "allows people to get reproductive care as early as possible when it is safest, least expensive, and least invasive," is "so safe that it presents lower risks of serious complications than taking Tylenol," and that its long safety record "is backed by science and cannot be erased at the whim of the Trump administration."

The FDA has previously said that fewer than 0.5% of women who take the drug experience "serious adverse reactions," and deaths are exceedingly rare.

The REMS program requires prescribers to add their names to national and local abortion provider lists, which can be a deterrent for doctors given safety threats, and pharmacies to comply with complex tracking, shipping and reporting requirements, which can be a deterrent to carrying the drug, Bonta said.

It also requires patients to sign forms in which they attest to wanting to "end (their) pregnancy," which Bonta said can be a deterrent for women using the drug after a miscarriage — one of its common uses — or for those in states pursuing criminal penalties for women seeking certain abortion care.

Under federal law, REMS requirements must address a specific risk posed by a drug and cannot be "unduly burdensome" on patients, and the new application to mifepristone "fails to meet that standard," Bonta said.

The states' petition is not a lawsuit, but a regulatory request for the FDA to reverse course, the states said.

If the FDA will not do so nationwide, the four petitioning states asked that it "exercise its discretion to not enforce the requirements" in their states, which Bonta's office said already have "robust state laws that ensure safe prescribing, rigorous informed consent, and professional accountability."

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