Triple Mechanism of Action
Retatrutide stacks three receptor pathways:
- GLP-1 receptor: Suppresses appetite, slows gastric emptying, improves insulin secretion
- GIP receptor: Enhances insulin response, improves fat metabolism, reduces GI side effects of GLP-1
- Glucagon receptor: Increases energy expenditure (metabolic rate), promotes fat oxidation in the liver
The glucagon component is the key differentiator. While glucagon alone raises blood sugar, in combination with GLP-1 its metabolic effects dominate — increasing calorie burn without significant glycemic impact.
Phase 2 Results vs. Competitors
| Compound | Targets | Peak Trial Weight Loss |
|---|---|---|
| Semaglutide | GLP-1 | ~15% at 68 weeks |
| Tirzepatide | GLP-1, GIP | ~21% at 72 weeks |
| Retatrutide | GLP-1, GIP, Glucagon | ~24% at 48 weeks |
Phase 2 data. Not head-to-head trials — populations and durations differ. Retatrutide not yet FDA approved.
Who Is a Candidate?
Retatrutide may be considered for:
- Patients who responded poorly or partially to semaglutide or tirzepatide
- Individuals with significant obesity (BMI 35+) who need aggressive intervention
- Patients with metabolic syndrome, NAFLD, or significant insulin resistance
- Those seeking the most aggressive pharmaceutical weight loss option available
Not FDA approved. Discuss the risk/benefit profile with your physician — available data is Phase 2 only.