Eli Lilly said patients taking its obesity drug Zepbound lost 47% more weight than those who were given Novo Nordisk's Wegovy in a study.

New data indicating Eli Lilly’s obesity shot Zepbound works better than Novo Nordisk’s Wegovy could add fuel to Lilly’s new efforts to market the drug as shortages ease. Recent months have brought new questions about whether the sky-high expectations for Zepbound’s sales—which have sent Lilly’s share price up more than 230% over the past three years—may be overly optimistic.

Patients self-administer the drug using a pre-dosed injector pen, but Lilly recently introduced the product in single-dose vials for injection via syringe -- a move to increase production of these popular drugs and decrease both costs of manufacturing and costs for the patient.