Mounjaro vs Retatrutide
Editorial comparison of Mounjaro (tirzepatide) and Retatrutide (retatrutide). Same drug class context, trial-anchored data, no marketing claims.
Side-by-side
| Dimension | Mounjaro | Retatrutide |
|---|---|---|
| Generic name | tirzepatide | retatrutide |
| Manufacturer | Eli Lilly | Eli Lilly |
| FDA approved | 2022 | — |
| Mechanism | Same as Zepbound — dual GLP-1/GIP receptor agonist. Strong glycemic effect plus weight loss. | Where semaglutide hits one receptor and tirzepatide two, retatrutide adds a third: the glucagon receptor. |
| Dosing | Titrated 2.5mg → 15mg weekly over months, same schedule as Zepbound. | Investigational. Trial dosing is once-weekly subcutaneous injection with gradual titration; final approved doses are not set. |
| Cost | Similar to Zepbound — list ~$1,000/month, LillyDirect Self-Pay $399-549/month. | No commercial price exists. Available only via clinical-trial enrollment. Beware any website selling 'retatrutide' today, it is not a legal product. |
| Pivotal trial result | 2.0–2.3% HbA1c reduction across SURPASS trials (15 mg dose) | ~24% mean body-weight reduction at 48 weeks (highest dose, Phase 2) |
Full Mounjaro review →
FDA-approved tirzepatide for type 2 diabetes. Off-label for weight loss is common.
Full Retatrutide review →
Investigational triple agonist (GLP-1 / GIP / glucagon). Phase 3 weight loss approached ~24%, the highest yet. Not FDA-approved; expected 2027.
Frequently asked
Is Mounjaro or Retatrutide more effective?+
In their pivotal trials, Mounjaro reported 2.0–2.3% HbA1c reduction across SURPASS trials (15 mg dose), while Retatrutide reported ~24% mean body-weight reduction at 48 weeks (highest dose, Phase 2). Head-to-head results vary by patient profile, dose tolerated, and adherence — these trial numbers describe averages, not what every individual experiences.
How do Mounjaro and Retatrutide compare on cost?+
Mounjaro: Similar to Zepbound — list ~$1,000/month, LillyDirect Self-Pay $399-549/month. Retatrutide: No commercial price exists. Available only via clinical-trial enrollment. Beware any website selling 'retatrutide' today, it is not a legal product. Real out-of-pocket depends on insurance formulary tier, manufacturer savings programs, and whether a direct-pay channel is available.
Can I switch from Mounjaro to Retatrutide?+
Switching between brand-name treatments in the same drug class is common, but the conversion is not always 1:1. Discuss the switch with your prescriber — they'll usually re-titrate dosing rather than substitute equivalent strengths directly.
Are Mounjaro and Retatrutide the same drug?+
No. Mounjaro (tirzepatide) and Retatrutide (retatrutide) are distinct medications from Eli Lilly and Eli Lilly respectively. They may share a drug class or mechanism but differ in active ingredient, dosing, and approved use.