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NEW YORK – The British drugmaker GlaxoSmithKline will no longer pay doctors to promote its products and will stop tying compensation of sales representatives to the number of prescriptions doctors write, its chief executive said Monday, effectively ending two common industry practices that critics have long assailed as troublesome conflicts of interest.

The announcement appears to be a first for a major drug company – although others may be considering similar moves – and it comes at a particularly sensitive time for Glaxo.

It is the subject of a bribery investigation in China, where authorities contend the company funneled illegal payments to doctors and government officials in an effort to lift drug sales.

Andrew Witty, Glaxo’s chief executive, said in a telephone interview Monday that its proposed changes were unrelated to the investigation in China, and are part of a years-long effort “to try and make sure we stay in step with how the world is changing,” he said.

“We keep asking ourselves, are there different ways, more effective ways of operating than perhaps the ways we as an industry have been operating over the last 30, 40 years?” he said.

For decades, pharmaceutical companies have paid doctors to speak on their behalf at conferences and other meetings of medical professionals, under the assumption that the doctors are most likely to value the advice of trusted peers.

But the practice has also been criticized by those who question whether it unduly influences the information doctors give each other and can lead them to prescribe drugs inappropriately to patients.

All such payments by pharmaceutical companies are to be made public next year under requirements of the Obama administration’s health care law.

Under the plan, which Glaxo said would be completed worldwide by 2016, the company will no longer pay health care professionals to speak on its behalf about its products or the diseases they treat “to audiences who can prescribe or influence prescribing,” it said in a statement. It will also stop providing financial support directly to doctors to attend medical conferences, a practice that is prohibited in the United States through an industry-imposed ethics code but that still occurs in other countries. In China, the authorities have said Glaxo compensated doctors for travel to conferences and lectures that never took place.

Witty declined to comment on the investigation because he said it was still under way.

Glaxo will continue to pay doctors consulting fees for market research because Witty said it was necessary for the company to gain insight from doctors about their products, but he said that activity would be limited in scope. A Glaxo spokesman said that each year the company spends “tens of millions” of dollars globally on the practices that it was ending, but declined to be more specific.

Glaxo is among the largest drug companies in the world, reporting global third-quarter sales of 6.51 billion pounds, or $10.1 billion, a 1 percent rise from the same period a year ago. Sales fell markedly in China as the investigation proceeded.

The move won qualified praise from Dr. Jerry Avorn, a professor at Harvard Medical School who has written critically about the drug industry’s marketing practices.

“It’s a modest acknowledgment of the fact that learning from a doctor who is paid by a drug company to give a talk about its products isn’t the best way for doctors to learn about those products,” Avorn said. But he noted that Glaxo would continue to provide what the company described in a statement as “unsolicited, independent educational grants” to continue educating doctors about their products.

He said that in the past the grants had often been provided to for-profit companies that rely on such payments from drug companies, raising questions about whether they are providing truly independent information.

Witty said while the details are still being worked out, the company intended to provide such grants to respected educational institutions and medical societies.

“I’d like to look for those sorts of partners, and I do not envision these partners being companies or pseudocompanies,” he said.

Beginning in 2015, Glaxo will also no longer compensate sales representatives based on the number of prescriptions doctors write, a standard practice that some have said pushed pharmaceutical sales officials to inappropriately promote drugs to doctors. I

In 2012, Glaxo paid a record $3 billion in fines to resolve charges that it had marketed drugs for unapproved uses. It is one of several major drug companies to have settled such cases in recent years.

Dr. Raed Dweik, the new chairman of the innovation management and conflict of interest committee at the Cleveland Clinic, said he hoped other companies would follow suit.

“As a physician, I periodically meet with these sales reps and they usually come in armed with information about me that I don’t even know,” he said, like the number of prescriptions he writes for the drug company’s product. “I feel that’s not really a comfortable interaction to have.”