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Mounjaro vs Zepbound

Mounjaro and Zepbound contain tirzepatide and share injection devices and dose-increase steps. Their approved uses, age limits and maintenance-dose guidance differ.

Source for this answer

Source: Read from both FDA labels on DailyMed

Source: Read from both FDA labels on DailyMed

Medically reviewed by Jennifer Montecillo, MD · non-practicing medical reviewerReviewed 2026-08-12every number here is sourced

Mounjaro and Zepbound, line by line

6 of 11 details match; 5 differ. Compare the approved uses, injection doses and other label details below.

Mounjaro and Zepbound compared line by line, from both FDA labels
QuestionMounjaroZepbound
What is in itSame on both labelsTirzepatideTirzepatide
Who makes itSame on both labelsEli Lilly and CompanyEli Lilly and Company
Starting dose2.5 mg once a week; increase only if more blood sugar control is needed, after at least 4 weeks2.5 mg once a week for 4 weeks, then 5 mg
Step sizeSame on both labels2.5 mg, after at least 4 weeks on the step below2.5 mg, after at least 4 weeks on the step below
Highest dose for adultsSame on both labels15 mg a week15 mg a week
How a missed week is handledSame on both labelsTake within 4 days of the missed dose; otherwise skip itTake within 4 days of the missed dose; otherwise skip it
DevicesSame on both labelsSingle-dose pen or vial, four-dose vial or KwikPenSingle-dose pen or vial, four-dose vial or KwikPen
Approved usesBlood sugar control in type 2 diabetes; heart-risk reduction in adults with type 2 diabetes at high riskWeight reduction, and moderate to severe obstructive sleep apnea in adults with obesity
Youngest patient coveredAge 10, with a ceiling of 10 mg rather than 15Adults only
Maintenance dosesNo separate maintenance-dose list; further increases depend on blood sugar control5, 10 or 15 mg for weight management; 10 or 15 mg for sleep apnea
What the label reports for nausea12, 15 and 18 in 100 at 5, 10 and 15 mg, against 4 on placebo25, 29 and 28 in 100 at the same three doses, against 8 on placebo

Product comparison at a glance

Mounjaro
Tirzepatide
Zepbound
Tirzepatide
Label differences
5 of 11 comparison rows differ
Direct trial
None published

Has anyone tested Mounjaro against Zepbound directly?

No direct trial is included in the sources below. The two products contain the same ingredient, but their doses and approved uses can differ.

Both labels draw on trials of tirzepatide. Those separate results cannot show which brand works better or causes fewer side effects. Sharing an active drug does not mean the doses or forms can be swapped.

5Comparison detailsWhat the differences mean and where to find more detail

The shared dose-increase steps

Both start at 2.5 mg once weekly and use 2.5 mg increases after at least four weeks on the current dose. Both have a 15 mg weekly maximum for adults.

Maintenance guidance differs. Zepbound names 5, 10 and 15 mg for weight management, and 10 or 15 mg for sleep apnea. Mounjaro bases further increases on blood sugar control rather than a separate list of maintenance doses.

The same doses, very different reported rates

Nausea sits at 25 to 29 in 100 on the Zepbound label and 12 to 18 on the Mounjaro one, at the same milligram figures.

The figures come from different trials: weight-management studies for Zepbound and diabetes studies for Mounjaro. They describe those study groups, not a direct comparison of the products.

Neither figure is a universal nausea rate for tirzepatide. Both labels caution against comparing side-effect rates across separate trials.

The label does not recommend combining them

The Zepbound label does not recommend use with another tirzepatide product or any GLP-1 receptor agonist. Mounjaro contains tirzepatide.

The shared ingredient does not make taking both a supported way to increase the dose.

What about “Zepbound vs Mounjaro”?

Reversing the names does not change the product details or trial results.

Read each result with its own dose, study group and limits, whichever name comes first.

The full label for each

Choose a product below to see its full dose schedule, side effects and storage rules.

Mounjaro

The Mounjaro dose schedule in fullMounjaro side effects, dose by doseStoring Mounjaro safely

Zepbound

The Zepbound dose schedule in fullZepbound side effects, dose by doseStoring Zepbound safely

Questions readers ask

Is Mounjaro more effective than Zepbound?

Both contain tirzepatide. Comparing the brand names alone does not establish a difference in how well the drug works.

Their labels cover different uses, with dose rules tied to those uses. Mounjaro treats type 2 diabetes; Zepbound covers weight management and certain sleep apnea in adults.

What is the strongest GLP-1 for weight loss?

SURMOUNT-5 found greater average weight loss with tirzepatide than with semaglutide: 20.2% versus 13.7% after 72 weeks.

That finding applies to the doses and adults studied. It does not rank every GLP-1 drug or predict which one will work best for one person.

Why does my insurance cover Mounjaro but not Zepbound?

The approved use can affect coverage. Mounjaro is approved for type 2 diabetes; Zepbound is approved for weight management and moderate-to-severe obstructive sleep apnea in adults with obesity.

Your plan may cover one use and exclude another, or require prior approval. Its current drug list and coverage terms are what establish your benefits.

What is cheaper, Zepbound or Mounjaro?

A missing price does not make the other brand cheaper. Compare prices for the same dose, supply length and payment route.

The cost guides separate cash prices from insurance savings offers. Check the date and eligibility rules before treating an advertised amount as your price.

9primary sources, each with the day we read it — open the documents used on this page

Mounjaro and Zepbound are registered trademarks of their makers. Neither maker wrote, reviewed or endorsed this guide. It draws on public FDA labels and cited studies. A clinician can advise on your care. For prices and insurance, see our cost and coverage guide.