Mounjaro and Zepbound contain the exact same drug: tirzepatide. They're made by the same company (Eli Lilly).
So why two names? It comes down to what they're approved for.
Quick Comparison
| Mounjaro | Zepbound | |
|---|---|---|
| Active drug | Tirzepatide | Tirzepatide |
| Drug class | Dual GIP/GLP-1 agonist | Dual GIP/GLP-1 agonist |
| FDA approval | Type 2 diabetes | Weight management |
| Dose range | 2.5 mg – 15 mg | 2.5 mg – 15 mg |
| Injection | Once weekly | Once weekly |
| Maker | Eli Lilly | Eli Lilly |
Same Drug, Different Label
Mounjaro is approved for type 2 diabetes. Weight loss happens as a side effect.
Zepbound is approved for weight management. It's the same drug, but marketed and approved for a different purpose.
The doses are identical. The pen device may look slightly different. But the medicine inside is the same.
Why Does This Matter?
Insurance coverage. That's the main reason.
- If you have diabetes, your insurance may cover Mounjaro.
- If you're using it for weight loss, your insurance may cover Zepbound.
- Some plans cover neither. Some cover both.
Your formulary will likely decide which one you get.
Weight Loss Results
Since they're the same drug, results are the same:
- Average weight loss: ~15-22% of body weight at max dose (15 mg)
- Trial length: 72 weeks
- Results vary person to person
Side Effects
Identical for both:
- Nausea (most common)
- Diarrhea or constipation
- Decreased appetite
- Vomiting (less common)
- Stomach pain
- Fatigue
Side effects are worst when you start and after dose increases. Most people adjust within a few weeks.
Cost
Both have a list price around $1,060/month. Your actual cost depends on:
- Insurance coverage
- Savings cards (Eli Lilly offers them for both)
- Pharmacy pricing
Who Should Use Mounjaro?
- You have type 2 diabetes
- Your insurance covers Mounjaro
- Your doctor prescribed it for blood sugar control
Who Should Use Zepbound?
- Your main goal is weight loss
- Your insurance covers Zepbound
- You don't have diabetes
Can You Switch?
Yes, and it's straightforward since the drug is the same. Your dose stays the same. The main reason to switch is insurance.
Bottom Line
Mounjaro and Zepbound are the same drug with different FDA approvals. Pick the one your insurance covers for your specific health need.
Work with your healthcare provider to determine which medication is right for you. Individual results and experiences vary.