The lawsuit alleges that Eli Lilly misled consumers by using outdated clinical trial data to make its drugs appear more effective than Novo's.

The lawsuit, filed in federal court Tuesday, accuses Eli Lilly of using outdated data in advertising campaigns.

The lawsuit follows a cease-and-desist request and argues Lilly is using “deceptive” ads to claim its GLP-1 products are broadly superior to Novo’s medicines. Lilly countered that…