Novo Nordisk, the maker of Wegovy, has filed a lawsuit on Tuesday against competitor Eli Lilly alleging that its GLP-1 advertisements are misleading. File Photo by John Angelillo/UPI | License Photo

July 21 (UPI) -- Novo Nordisk, the maker of Wegovy, filed a lawsuit on Tuesday against competitor Eli Lilly, alleging that its GLP-1 advertisements are misleading.

Novo Nordisk claims that Eli Lilly is citing "outdated" clinical trial data in advertisements that claim its injectable weight-loss drugs are superior. The lawsuit contends that the advertisements are "deliberately false."

"What's really in focus here is a nationwide pattern of deceptive advertising, where campaigns are misleading people with obesity and diabetes by comparing the highest doses of Lilly's medicines with the lower doses of Novo's medicines," John Kuckelman, senior vice president and group general counsel for Novo Nordisk, said in an interview with USA Today. "The patients are left with the misleading impression that Lilly's drugs are superior to Novo's."

The advertisements in question do not include updated evidence on Novo Nordisk's recently approved high-dose version of Wegovy, which is comparable to the weight loss drugs produced by Eli Lilly.