Following a landmark ruling in Oklahoma that ordered pharmaceutical giant Johnson & Johnson and its subsidiaries to pay US$572 million for its role in fuelling the state’s opioid crisis, lawyers say the decision could have a profound effect on similar lawsuits in Canada.

On Monday, Cleveland County District Judge Thad Balkman sided with the state of Oklahoma in its argument that Johnson & Johnson and their subsidiaries created a public nuisance through aggressive advertising campaigns for painkillers that downplayed the risk of addiction. The lawsuit alleged the consumer goods company contributed to the state’s devastating opioid crisis, which Oklahoma’s attorney general Mike Hunter says killed 4,653 people in the state from 2007 to 2017.

The ruling is significant because it’s the first state opioid case to make it to trial, paving the way for thousands of other lawsuits in the U.S. and in Canada. Oklahoma had earlier reached settlements worth less than half of what Johnson & Johnson was ordered to pay with two other pharmaceutical manufacturers, Purdue Phama Inc. and Teva Pharmaceutical Industries Ltd.

“That’s the message to other states: We did it in Oklahoma. You can do it elsewhere,” Hunter said. “Johnson & Johnson will finally be held accountable for thousands of deaths and addictions caused by their activities.”

Lawyers for Johnson & Johnson said they plan to appeal the ruling to the Oklahoma Supreme Court.

In British Columbia, which has borne the brunt of the opioid crisis in Canada, Attorney General David Eby applauded the decision rendered in Oklahoma.

Last year, the province filed a class-action lawsuit against dozens of pharmaceutical companies, including Purdue Pharma Inc., which makes the painkiller OxyContin, to recover costs associated with the public health crisis. The suit accuses the companies of falsely marketing the opioids as less addictive than other painkillers, leading to an overdose crisis that has killed thousands of people in the province since the drugs were introduced in the 1990s.

"To have a judge say: 'Yes, we do see a serious problem here with how this company conducted itself and we do feel that it needs to be paying money out because of the way it marketed these very addictive and harmful drugs,' is a very positive sign for our litigation here in Canada," he told The Canadian Press on Tuesday.

Neil Boyd, a criminology professor at Simon Fraser University, said while the ruling in the United States is not binding in Canada, it does show there is merit to the lawsuit in B.C.

"The concern about pharmaceutical companies and the roles that they have played is a concern that goes beyond the boundary of a single jurisdiction," he said. "The precedent of a finding that a pharmaceutical company contributed to the problem that we have seen across North America, I'm very sure that ruling has the attention of a number of pharmaceutical companies."

The governments for Ontario and New Brunswick have said they plan to join the lawsuit. The governments for Newfoundland, Nova Scotia and Quebec, meanwhile, are participating in a national working group related to the case.

There is also another proposed class-action lawsuit against large pharmaceutical companies, including Apotex, Bristol-Myers Squibb, Johnson & Johnson, and the Jean Coutu Group, filed in Ontario Superior Court on behalf of patients who have become addicted to opioids. The untested statement of claim is seeking more than $1.1 billion in damages alleging the companies were negligent in how they researched, developed, and marketed the drugs.

None of the allegations in either claim have been proven in court.

Jasmine Daya, a Toronto-based lawyer who is not involved in any of the lawsuits, said the case in Oklahoma will be used as a basis for similar claims in Canada.

“I believe it’s going to have a lot of influence here in Canada because it has set the framework. It is a landmark decision,” she told CTV’s Your Morning. “In Canada, the provinces have not pursued pharmaceutical companies in the way that Oklahoma did just yesterday.”

Daya said it’s interesting that Oklahoma chose to pursue a public nuisance claim against Johnson & Johnson because it’s a strategy that is rarely ever used in Canada – and if it is, it’s usually in the context of property disputes.

“It has never been used, from what I know, in the context of pharmaceutical companies,” she said. “I think we would consider using negligence and product liability. We could consider public nuisance, but it’s just very rare.”

Reidar Mogerman, a class-action lawyer in B.C. who is also not involved in any of the lawsuits, agreed that Oklahoma’s case will influence what happens in the cases in Canada.

“It’s a big ruling,” he told CTV News Channel on Monday. “It’s a very positive step for states, provinces, cities that are trying to get the companies to take responsibility for the wrongdoing that’s caused this terrible crisis.

Dr. Michael Curry, a clinical associate professor at the University of British Columbia who has a legal background, told The Canadian Press he believes the pharmaceutical companies named in the B.C. lawsuit might be more inclined to settle after witnessing the payout Johnson & Johnson faced in Oklahoma.

“I do think it emphasizes to the pharmaceutical companies that there is going to be some accounting for or responsibility for some of their actions during the opioid crisis,” he said. “I think it creates pressure from a stock market basis and also a legal basis to settle these claims.”

While Daya said the lawsuit in Oklahoma moved through the court system relatively quickly since it was first launched in 2017, she said it’s unlikely there will be a resolution to the claims in Canada anytime soon.

“We have the rules of civil procedure, which means a lot of proceedings that must be followed and adhered to, we have to then follow all these steps before we can even have a trial date,” she said. “If I went to the Toronto courthouse right now and said ‘I’ve done every single step, it’s taken the last few years,’ they would give me a trial date today that is in 2021.”

Johnson & Johnson’s stock price rose more than 5 per cent on Tuesday following news of the decision, though experts believe it’s because the payout fell well below the $1 billion they expected.

With files from The Canadian Press and The Associated Press