The obesity drug helped patients reduce their waist size by an extra two inches compared to those on Novo Nordisk’s Wegovy in a head-to-head study of the two drugs.

Eli Lilly said on Sunday its drug Zepbound was superior to Novo Nordisk's Wegovy across five weight-loss targets such as reducing waist circumference, citing data from a head-to-head trial.

Eli Lilly and Co's obesity drug Zepbound led to greater weight loss than Novo Nordisk's Wegovy in a head-to-head Phase 3b trial, according to data published in The New England Journal of Medicine and presented at the European Congress on Obesity.