Sen. Claire McCaskill of Missouri demanded information Tuesday from five top opioid manufacturers, saying she would investigate their alleged role in the drug epidemic responsible for more than 200,000 overdose deaths since 2000.

“This epidemic is the direct result of a calculated sales and marketing strategy major opioid manufacturers have allegedly pursued over the past 20 years to expand their market share and increase dependency on powerful – and often deadly – painkillers,” McCaskill, who is the ranking Democrat of the Homeland Security and Governmental Affairs Committee, wrote to company executives. “To achieve this goal, manufacturers have reportedly sought, among other techniques, to downplay the risk of addiction to their products and encourage physicians to prescribe opioids…”

McCaskill sent letters to Purdue Pharma, Janssen Pharmaceuticals, Insys Therapeutics, Mylan, and Depomed, which she said make the top-five-selling prescription painkillers. She is seeking sales and marketing materials, any studies the companies might have conducted about the addictive properties of their drugs, information on compliance with legal settlements and figures on donations to advocacy groups.

McCaskill said she wants to know whether manufacturers have contributed to overuse and overprescribing of opioids. According to the Centers for Disease Control and Prevention, nearly 180,000 people have died of overdoses of prescription opioids since 2000 and tens of thousands more have succumbed to overdoses from heroin and fentanyl.

Most of the companies said Tuesday that they were reviewing McCaskill’s request. A spokesman for Purdue Pharma issued a statement noting that its brand-name product, OxyContin, “accounts for only 2 percent of the opioid analgesic prescriptions nationally, but we are an industry leader in the development of abuse-deterrent technology and advocating for the use of prescription drug monitoring programs. We are reviewing Senator McCaskill’s letter and will respond accordingly.”

And in a separate statement, a spokeswoman for Janssen Pharmaceuticals said “we believe that we have acted appropriately, responsibly and in the best interests of patients regarding our opioid pain medications, which are FDA-approved and carry FDA-mandated warnings …”

Earlier this month, McCaskill asked the Justice Department’s inspector general to investigate why the Drug Enforcement Administration had delayed or blocked enforcement efforts against wholesale distributors of opioids accused of failing to follow laws designed to keep legal painkillers from reaching the black market.

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