The U.S. Food and Drug Administration (FDA) has approved Eli Lilly's drug tirzepatide, marketed as Zepbound, for weight loss. The drug was previously approved for the treatment of Type 2 diabetes under the name Mounjaro. The approval allows adults with obesity or overweight with at least one weight-related condition to use the drug for chronic weight management.
Zepbound works by activating two naturally produced hormones in the body, slowing the emptying of the stomach and suppressing appetite. It belongs to a group of drugs that mimic incretins, hormones released by the gut in response to food. The drug is injected once a week in progressively higher doses over up to 20 weeks.
The approval was based on two of Eli Lilly's late-stage trials on tirzepatide, which evaluated its effects on weight loss after 72 weeks. However, access to tirzepatide and other diabetes and obesity treatments remains a challenge due to high costs and insurance coverage issues. The drug can cause side effects such as nausea, vomiting, hair loss, and reflux.
The cost for a month's supply of Zepbound is $1,059.87, which is cheaper than a similar weight-loss drug, Wegovy, made by Novo Nordisk A/S, priced at $1,349 for a month's supply. Zepbound is expected to be available soon after Thanksgiving.
The approval of Zepbound poses a challenge to Novo Nordisk's dominance in the weight loss market. The weight loss market could reach $100 billion by 2035, according to BMO Capital Markets analyst Evan David Seigerman.