By Russ Britt, MarketWatch

Drug retail giant CVS Health Corp. is girding to do battle with pharmaceutical companies over a coming class of cholesterol drugs that CVS says could cost the nation's health-care system $150 billion a year.

CVS (CVS), the nation's biggest health-related company with nearly $140 billion in annual sales, says this new strata of cholesterol drugs, believed to be a cut above previous medications, would severely strain the health-care system if prescribed to all the 15 million Americans who could benefit from the drugs.

With annual costs running between $7,000 and $12,000 for the medication, CVS officials say the drugs -- known in the industry as PCSK9 inhibitors -- could weigh on the system more than a class of hepatitis C drugs put on the market in the past year and a half, led by Gilead Sciences Inc.'s (GILD) Sovaldi, costing $1,000 a day. CVS officials said the controversy over Sovaldi has faded, perhaps falsely suggesting that the system is resilient.

"We believe that resiliency is about to be challenged in a manner unlike we have seen in the past, at least in the area of pharmaceuticals," a group of CVS officials led by William Shrank, the company's chief medical officer, wrote in a blog post for the trade magazine Health Affairs early Tuesday.

Shrank warns that while the hepatitis C drugs could also cost $150 billion, that would be spread out over a decade. But this class of cholesterol medicines could cost that much in a single year. With potential users numbering 15 million, that is five times the 3 million believed eligible for hepatitis C drugs.

"As this is chronic therapy, PCSK9 sales could be expected to persist and grow over time, and will likely be the highest selling class of medications in history. Plus, as a biologic agent, there will not be a simple pathway to cheaper generics in a 10-15 year time frame. Even in a system that costs $4 trillion per year, a single therapy adding $100 billion-$200 billion in costs annually is extraordinary," he wrote.

The warnings are reminiscent of last year's battles between Gilead and insurers. America's Health Insurance Plans, the trade group for carriers, took Gilead to task for pricing Sovaldi and follow-on medication Harvoni at a level that put severe burdens on insurers. As more hepatitis C drugs are entering the market, the price is beginning to come down, but Gilead's revenue from this class of medications, which have proved to be more than 95% effective, surpassed $10 billion last year.

Drug and biotech giants such as Pfizer Inc. (PFE) , Amgen Inc. (AMGN) , Merck & Co. Inc. and an alliance between Sanofi Inc. (SNY) and Regeneron Pharmaceuticals Inc. (REGN) are developing this new class of cholesterol drugs that is due to start hitting the market later this year.

Industry sources say Amgen has the inside track with its drug now known as Evolocumab, which has passed through its testing phases and filed for approval with the U.S. Food and Drug Administration last year. Amgen may get the nod within the next few months. Pfizer and the Sanofi-Regeneron alliance are believed to be close behind, and could hit the market with their own drugs just a few months after.

If that's the case, it means CVS's concerns are overwrought, says Holly Campbell, spokeswoman for PhRMA, the drug industry's trade group. She says the company is incorporating all potential users of the drug into the mix, with all paying list prices, with its $150 billion figure.

"That's not actually what happens," she said. Campbell says competition and market forces are bringing down the impact the price on these new cholesterol drugs. She says that with these cholesterol drugs, the competition will be at least as vigorous as with hepatitis C, if not more so.

"We're really seeing how competition is going to work," Campbell said. She also points out that Sovaldi and the other hepatitis C drugs have worked to bring down overall health-care costs.

"The value of these medicines really need to be part of the conversation," she said.

PCSK9 inhibitors will usually be injected once or twice a month, and are considered to be well-tolerated and effective in reducing so-called "bad" cholesterol. The prime candidates for the drug are those with a family history of high cholesterol, though there is growing interest in allowing other subgroups to use it, such as those who are intolerant to statins or those with a history of coronary artery disease.

-Russ Britt; 415-439-6400; AskNewswires@dowjones.com

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