Compared, cited
Mounjaro vs Zepbound
Mounjaro and Zepbound are the same medicine - tirzepatide - from Eli Lilly. The molecule is identical; the approved use and branding differ. Here is the real distinction.
Last updated August 2026
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| At a glance | Mounjaro | Zepbound |
|---|---|---|
| Molecule | Tirzepatide | Tirzepatide (identical) |
| FDA-approved for | Type 2 diabetes only | Weight management; obstructive sleep apnea |
| Max dose | 15 mg weekly | 15 mg weekly (same) |
| Half-life | ~5 days | ~5-6 days |
| Weight loss data | Not its approved use (off-label) | -20.9% average (SURMOUNT-1, 15 mg, 72 wk) |
| Form | Pen or single-dose vial | Pen or single-dose vial |
Same molecule, different label
Both Mounjaro and Zepbound are tirzepatide, made by Eli Lilly. Mounjaro is FDA-approved only for type 2 diabetes. Zepbound is FDA-approved for chronic weight management and, separately, for moderate to severe obstructive sleep apnea in adults with obesity. Using Mounjaro purely for weight loss is off-label, even though the molecule is identical.
Dose and access
Both titrate to the same 15 mg weekly maximum and share the same dosing schedule. As with Ozempic and Wegovy, the split is about approved indication and coverage - a diabetes plan may route to Mounjaro, an obesity or sleep-apnea indication to Zepbound.
Who fits which
Mounjaro
Prescribed for type 2 diabetes glycemic control.
Zepbound
Prescribed for chronic weight management or obstructive sleep apnea. The version approved and studied for weight loss.
The cited card
Mounjaro
tirzepatide, for diabetes
Questions people ask
Are Mounjaro and Zepbound the same?
Yes - both are tirzepatide from Eli Lilly, at the same doses. They differ only in approved use (diabetes vs weight management and sleep apnea) and brand name.
Can you use Mounjaro for weight loss?
Mounjaro is approved only for type 2 diabetes, so weight-loss use is off-label. Zepbound is the tirzepatide brand approved for chronic weight management.
Sources
- [1]Mounjaro (tirzepatide) FDA label, DailyMedMounjaro approved for type 2 diabetes glycemic control only.
- [2]Zepbound (tirzepatide) FDA label, DailyMedZepbound approved for chronic weight management and obstructive sleep apnea.
- [3]Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1), NEJM 2022Tirzepatide 15 mg: -20.9% mean weight change vs -3.1% placebo at 72 weeks.
Full cited data for each compound is on its library page, linked above. Weight-loss figures are trial averages; individual results vary.
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