Pfizer IncPfizer's lead obesity drug berobenatide advances in phase III with potential 2028 approval, targeting a large market.

Pfizer is advancing berobenatide, a long-acting GLP-1 receptor agonist acquired through its 2025 purchase of Metsera, as its lead candidate to compete in the obesity market projected to reach nearly $114 billion by 2030. The drug is in phase III development for chronic weight management and is designed to transition from weekly to monthly maintenance dosing, with phase IIb VESPER data showing meaningful weight loss and a favorable tolerability profile. Pfizer plans to start more than 20 obesity studies in 2026, including 10 phase III trials for berobenatide in obesity and related conditions such as knee osteoarthritis and obstructive sleep apnea, and is targeting the first potential approvals in 2028. The company is also evaluating berobenatide in combination with an ultra-long-acting amylin analog, PF'3945, in phase II studies with additional data expected later this year. Pfizer faces competition from Eli Lilly and Novo Nordisk, which dominate the market with Zepbound and Wegovy, as well as from Amgen, Roche, AstraZeneca, AbbVie, and smaller biotechs developing next-generation obesity treatments.
Pfizer IncPfizer's lead obesity drug berobenatide advances in phase III with potential 2028 approval, targeting a large market.
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