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Three years ago, pharma giant Pfizer paid $24 million to settle federal allegations that it was paying kickbacks and inflating sales by reimbursing Medicare patients for out-of-pocket medication costs.

By making prohibitively expensive medicine essentially free for patients, the company induced them to use Pfizer drugs even as the price of one of those medicines, covered by Medicare and Medicaid, soared 44% to $225,000 a year, the Justice Department alleged.

Now, Kaiser Health News reports that Pfizer is suing the federal authorities to legalize essentially the same practice it was accused of three years ago – a fighting response to a federal crackdown that has resulted in a dozen drug companies being accused of similar practices.

A Pfizer win could cost taxpayers billions of dollars and erase an important control on pharma marketing after decades of regulatory erosion and soaring drug prices, say health policy analysts. A federal judge’s ruling is expected any day.

“If this is legal for Pfizer, Pfizer will not be the only pharmaceutical company to use this, and there will effectively be a gold rush,” government lawyer Jacob Lillywhite said in oral arguments last month.

Pfizer’s legal argument “is aggressive,” said Chris Robertson, a professor of health law at Boston University. “But I think they’ve got such a political tailwind behind them” because of pocketbook pain over prescription medicine – even though it’s caused by pharma manufacturers. Pfizer’s message, “‘We’re just trying to help people afford their drugs,’ is pretty attractive,” he said.

That’s not all that’s working in Pfizer’s favor. Courts and regulations have been moving pharma’s way since the Food and Drug Administration allowed limited TV drug ads in the 1980s. Other companies of all kinds also have gained free speech rights allowing aggressive marketing and political influence that would have been unthinkable decades ago, legal scholars say.

Among other court arguments, Pfizer initially claimed that current regulation violates its speech protections under the First Amendment, essentially saying it should be allowed to communicate freely with third-party charities to direct patient assistance.

“It’s infuriating to realize that, as outlandish as they seem, these types of claims are finding a good deal of traction before many courts,” said Michelle Mello, a professor of law and medicine at Stanford University. “Drug companies are surely aware that the judicial trend has been toward more expansive recognition of commercial speech rights.”

Pfizer’s lawsuit, in the Southern District of New York, seeks a judge’s permission to directly reimburse patient expenses for two of its heart-failure drugs each costing $225,000 a year. An outside administrator would use Pfizer contributions to cover Medicare copays, deductibles and coinsurance for those drugs, which otherwise would cost patients about $13,000 a year.

Letting pharma companies put money directly into patients’ pockets to pay for their own expensive medicines “does induce people to get a specific product” instead of shopping for a cheaper or more effective alternative, said Stacie Dusetzina, an associate professor of health policy at Vanderbilt University. “It’s kind of the definition of a kickback.”

Government rule-makers have warned against such payments since the launch of Medicare’s Part D drug benefit in 2006. Drug companies routinely help privately insured patients with cost sharing through coupons and other means, but private carriers can negotiate the overall price.

Because Congress gave Medicare no control over prescription drug prices, having patients share at least part of the cost is the only economic force guarding against unlimited price hikes and industry profits at taxpayer expense.

At the same time, however, regulators have allowed the industry to help patients with copays by routing money through outside charities – but only as long as the charities are “bona fide, independent” organizations that don’t match drugmaker money with specific drugs.

Several charities have blatantly violated that rule in recent years by colluding with pharma companies to subsidize particular drugs, the Justice Department has alleged. A dozen companies have paid more than $1 billion to settle allegations of kickback violations.