Research

Hormonal

Tirzepatide, a dual GIP and GLP-1 receptor agonist, produces substantial, clinically meaningful, and sustained weight reduction in adults with obesity (BMI ≥30 or ≥27 with comorbidities) when used as an adjunct to lifestyle intervention, demonstrating superior efficacy compared to selective GLP-1 receptor agonists.

If you have obesity (BMI ≥30, or ≥27 with health issues like high blood pressure or sleep apnea), tirzepatide is a once-weekly injection that works by mimicking gut hormones (GIP and GLP-1) to help you lose weight. It is used alongside a reduced-calorie diet and exercise. The dose starts low (2.5 mg) and increases every 4 weeks to minimize stomach issues, reaching up to 15 mg. Clinical trials are designed to show it causes more weight loss than older drugs like semaglutide.

ModerateSupportsMEDIUM confidence
Tirzepatide, a novel glucose-dependent insulinotropic polypeptide and GLP-1 receptor agonist, showed greater weight reduction than selective GLP-1 receptor agonists in type 2 diabetes studies... In the SURMOUNT-1 trial, once-weekly tirzepatide provided substantial, clinically meaningful, and sustained reductions in body weight in participants without diabetes.
Carel W. le Roux et al. · Obesity · 2022

Why this rating

This is a clinical development program design paper; primary results for most trials are not yet published, relying on phase 1/2 data and trial design rationale.

Source

Tirzepatide for the treatment of obesity: Rationale and design of the <scp>SURMOUNT</scp> clinical development program

Carel W. le Roux et al. · Obesity · 2022

DOI 10.1002/oby.23612

rct · n=5066Cited 82×
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DOI resolved against Crossref · corpus check 2026-06-10

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