Medication Comparison
Semaglutide vs Retatrutide
Retatrutide's Phase 2 data shows ~24% weight loss at 48 weeks — potentially exceeding even tirzepatide. However, it is not yet approved or available. Semaglutide is the proven, available option today. If retatrutide's Phase 3 trials confirm these results, it could become the most effective obesity medication.
| Category | Semaglutide | Retatrutide |
|---|---|---|
| Brands | Ozempic / Wegovy | Not yet approved |
| Class | GLP-1 RA | GLP-1/GIP/Glucagon triple agonist |
| Administration | Weekly injection | Weekly injection |
| Average weight loss | ~15% | ~24% |
| Compounded cost | $150-400/mo (compounded) | Not yet available |
| Brand cost | $1,000-1,400/mo | Not yet available |
| Half-life | ~7 days | ~6 days |
| Dosing frequency | Once weekly | Once weekly |
| Key trial | STEP 1 (16.9% weight loss) | Phase 2 (up to 24.2% weight loss at 48 weeks) |
Best for Semaglutide
Patients who need treatment now with a proven, available medication
Best for Retatrutide
Future option — currently only available through clinical trials
Semaglutide tradeoffs
Pros
- FDA-approved and available now
- Extensive clinical data
- Compounded versions available
Cons
- Less weight loss than retatrutide (based on early data)
- Single-receptor mechanism
Retatrutide tradeoffs
Pros
- Triple mechanism (GLP-1 + GIP + glucagon)
- Potentially greatest weight loss yet
- May preserve lean mass better
Cons
- Not FDA-approved
- Only Phase 2 data available
- Timeline to market uncertain
Common questions
When will retatrutide be available?
Retatrutide is currently in Phase 3 trials. If successful, FDA approval could come in 2026-2027. Until then, it is only available through clinical trials.
Is retatrutide better than semaglutide?
Early Phase 2 data suggests retatrutide may produce more weight loss (~24% vs ~15%), but Phase 3 data is needed to confirm. It also targets three receptors vs one for semaglutide.
How does the triple agonist mechanism work?
Retatrutide activates GLP-1 (appetite suppression), GIP (metabolic improvement), and glucagon (increased energy expenditure) receptors simultaneously, potentially creating a more comprehensive metabolic effect.
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