A Phase 3, Randomized, Active- and Placebo-Controlled, Partially-Blinded Study to Compare the Efficacy and Safety of KAI-9531 Administered Once Weekly Versus Semaglutide and Placebo in Participants Living With Obesity Who Do Not Have Diabetes

ClinicalTrials13 Mar 2026·Phase 3● 5/10i

A Phase 3, Randomized, Active- and Placebo-Controlled, Partially-Blinded Study to Compare the Efficacy and Safety of KAI-9531 Administered Once Weekly Versus Semaglutide and Placebo in Participants Living With Obesity Who Do Not Have Diabetes

Kailera

A phase 3 trial is testing KAI-9531, a once-weekly subcutaneous injection, versus semaglutide and placebo for weight loss in 1,200 people with obesity without diabetes. The 76-week randomized, partially-blinded study targets completion in March 2028 with percent body weight change as the primary endpoint. Kailera is positioning KAI-9531 as a direct competitor to Wegovy in the crowded obesity market, attempting to differentiate through superior weight loss efficacy. This represents another entrant challenging Novo Nordisk's established position in obesity treatment.

Strategic signal

Kailera faces substantial market access hurdles with KAI-9531 given the established obesity market dominated by Wegovy and Zepbound. Payers will demand compelling evidence of superior weight loss versus Wegovy's proven 15-17% reduction to justify formulary placement alongside existing GLP-1 options. The 2028 completion timeline means KAI-9531 enters a mature market where oral formulations from Novo and Lilly may already be available, requiring differentiated positioning beyond injectable delivery.

GLP-1Weight lossKailera Novo Nordisk

Original Abstract

The primary objective of this study is to demonstrate that KAI-9531 subcutaneous (SC) injection once weekly is superior to semaglutide SC once weekly and to placebo SC once weekly on percent change in body weight. | Condition(s): Obesity | Primary endpoint(s): Percent Change From Baseline in Body Weight at Week 76 | Enrollment: 1,200 (estimated) | Phase: Phase 3 | Sponsor: Kailera | Expected completion: 2028-03-20 | Status: Recruiting | Last update: 2026-03-13

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