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Novo Nordisk has accused arch-rival Eli Lilly of peddling false claims about its weight-loss products in advertising campaigns, marking the latest salvo in the battle for supremacy between the world’s biggest makers of obesity drugs.
Novo alleged in a lawsuit filed on Tuesday in a New Jersey court that Lilly was running an advertising campaign that was “deliberately false” and designed to mislead consumers over the “comparative efficacy” of the diabetes and weight-loss drugs sold by both companies.
The Danish drugmaker’s claim argues that Lilly has been citing outdated clinical trial data to support claims that its obesity drug, Zepbound, delivered higher average weight loss than Novo’s competing product, Wegovy.
Novo further alleges that Lilly’s ad campaign has falsely told patients that its diabetes medication, Mounjaro, was more effective than Novo’s Ozempic in lowering blood sugar levels.
The claim comes as the two big pharma groups are rolling out oral weight-loss pills that could increase take-up of the treatments significantly.
Novo’s filing said Lilly’s ads for injectable products Zepbound and Mounjaro were “maliciously and deceptively false”, and they created the impression that the company had more effective diabetes and weight-loss treatments than its rival.
Novo is seeking a permanent injunction barring Lilly from continuing to run the advertisements and a correction. Its filing also calls for “any and all of defendants’ profits” collected as a result of the advertising to be paid as damages.
Lilly did not immediately respond to a request for comment. The company has yet to file a defence.
John Kuckelman, Novo’s general counsel, told the FT that the group had sent a cease-and-desist letter to Lilly in April but Novo “did not get the courtesy of a response”.
Kuckelman said Lilly instead added a “very small” disclaimer that the Wegovy 7.2mg injectable, the highest dose approved by the FDA in March, was not included in the trials claiming that Zepbound delivered superior weight loss to Wegovy. “You cannot use a misleading disclaimer to fix a misleading advertisement,” he said.
The lawsuit, lodged in the US District Court for the District of New Jersey, marks the latest showdown between the two groups, the only companies with approved products in the blockbuster weight-loss market.
Lilly has an edge over Novo in the weight-loss market across both diabetes and obesity drugs. But Novo has gained ground with its Wegovy weight-loss pill, which launched in the US in January before Lilly’s oral option became available to patients in April.
