Novo Nordisk has accused rival Eli Lilly of runnin | Novo Nordisk has accused Eli Lilly of running ad campaigns containing “deliberately false” messages that mislead the public about the comparative efficacy of GLP-1 medicines.

The lawsuit, filed in federal court Tuesday, accuses Eli Lilly of using outdated data in advertising campaigns.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