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Mounjaro vs Zepbound: what the two labels actually say

Mounjaro and Zepbound are the same drug, tirzepatide, from the same maker, in the same devices, on the same step pattern. Four things separate them.

Source: Read from both FDA labels on DailyMed

What matters first

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

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

Mounjaro and Zepbound, line by line

Of the 11 lines below, 7 are identical on both labels and 4 are not. The identical ones are kept in, because they are most of the answer.

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 doseSame on both labels2.5 mg once a week for 4 weeks2.5 mg once a week for 4 weeks
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
Top dose for adultsSame on both labels15 mg a week15 mg a week
How a missed week is handledSame on both labelsWithin 4 days the dose can still go inWithin 4 days the dose can still go in
DevicesSame on both labelsSingle-dose pen or vial, four-dose vial or KwikPenSingle-dose pen or vial, four-dose vial or KwikPen
What the label approvesBlood sugar control in type 2 diabetesWeight 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
Doses you can stay onThe label names none. Any step from 5 mg up, chosen on blood sugar control5, 10 or 15 mg. 7.5 and 12.5 mg are steps you pass through
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

Has anyone tested Mounjaro against Zepbound directly?

No, and there is no reason anyone would. A trial pitting a drug against itself under two brand names would have nothing to measure.

Trials of tirzepatide exist in numbers, and both labels are built on them. What none of them does is compare the two products, because the products are the same substance. Any page claiming one beat the other in a trial is describing something that has not happened.

5Comparison detailsLabel interpretation, alternate phrasing, and product handoffs

The dose schedules really are identical

This is the part worth being blunt about. Both start at 2.5 mg for four weeks, both then go to 5 mg, both climb in 2.5 mg steps needing at least four weeks each, and both stop at 15 mg for adults.

Anyone telling you one schedule is gentler than the other is not reading the labels. What differs is the label’s account of which of those steps you can settle on: Zepbound names 5, 10 and 15, and Mounjaro names none at all.

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 trials are the reason. Zepbound’s table comes from weight trials in adults with obesity and prints everything at 2 in 100 and above. Mounjaro’s comes from diabetes trials, mostly in people already on other diabetes medicines, and prints at 5 in 100 and above.

Neither figure is the truth about tirzepatide. They are two measurements of two populations, and the labels say as much.

You cannot be on both

The Zepbound label says not to take it alongside another tirzepatide product, or any GLP-1 receptor agonist. Mounjaro is a tirzepatide product.

That rules out stacking them, and it makes the choice between them a real one rather than a matter of which pharmacy has stock.

What about “Zepbound vs Mounjaro”?

It is the same comparison with the names reversed, so both searches lead to this answer.

Publishing both orderings would mean two near-identical pages competing with each other for one answer. We publish one page per pair and let both phrasings land on it.

The full label for each

Compare the products here, then open each product’s own dose schedule and side-effect table for the details.

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?

They are the same drug substance, tirzepatide, from the same company, at the same weekly doses. No trial has compared them because there is nothing to compare.

What differs is the approved use written on each label, and the device the prescription is filled with.

What is the strongest GLP-1 for weight loss?

By the only head-to-head in adults with obesity, tirzepatide. SURMOUNT-5 reported 20.2% of body weight lost over 72 weeks against 13.7% for semaglutide.

That trial was open-label and funded by the maker of the tirzepatide arm. Both are worth holding alongside the result rather than after it.

Why does my insurance cover Mounjaro but not Zepbound?

Because coverage follows the approved use, and these two labels do not share one. Mounjaro is approved for blood sugar in type 2 diabetes; Zepbound is approved for weight and for sleep apnea in adults with obesity.

Plans have historically treated those as different categories. This site reads labels and published program terms, not individual plan formularies, so it cannot tell you what your own plan does.

What is cheaper, Zepbound or Mounjaro?

Zepbound, if you are paying cash — and only because Mounjaro has no published cash price at all. Lilly lists Zepbound dose by dose, from $299 at 2.5 mg to $449 or $699 at the top depending on refill timing.

For Mounjaro the same company says only that it is sold for self-pay, and names no number. With commercial coverage both cards reach $25 a month.

8primary sources, each with the day we read it — open the documents used on this page

Mounjaro and Zepbound are registered trademarks of their manufacturers. This page is not written, reviewed or endorsed by them. It reports what two public FDA labels state, and it is not medical advice. It also does not cover price or insurance coverage, which change too often to publish responsibly here.