Mounjaro or Zepbound? An Honest Comparison (2026)

These two come up side by side all the time, and it’s easy to feel stuck choosing between them. We’ve laid out how Mounjaro and Zepbound differ on the things that actually shape your day-to-day — results, cost, how you take them, and how they tend to feel — so you can head into your next appointment with a clear question instead of a guess.

The quick answer

In short: Mounjaro (Tirzepatide) helps people lose around 15–22% of their body weight at roughly $1,023/mo, while Zepbound (Tirzepatide) averages about 20–22% at roughly $1,060/mo. Neither is a clear winner for everyone — what tips the scale is your goals, what your insurance covers, and how your body takes to it.

The two, side by side

Feature	Mounjaro	Zepbound
Active ingredient	Tirzepatide	Tirzepatide
Drug class	Dual GLP-1/GIP receptor agonist	Dual GLP-1/GIP receptor agonist
Manufacturer	Eli Lilly	Eli Lilly
FDA approved for	Type 2 diabetes	Chronic weight management
Approval year	2022	2023
Doses	2.5, 5, 7.5, 10, 12.5, 15 mg	2.5mg to 15mg weekly
Administration	Weekly injection (pen)	Weekly injection (pen / vial)
Avg. weight loss	15–22%	20–22%
A1C reduction	1.9–2.4%	1.9–2.4%
Monthly cost (list)	$1,023	$1,060
Oral available	No	No

Prices shown are typical self-pay list costs without insurance. Seed data — please verify before relying on it.

Mounjaro

15–22%

avg. body-weight loss

A weekly tirzepatide shot for type 2 diabetes that works on two hunger pathways at once, which is why trial participants tend to see some of the biggest average weight loss of any option.

$1,023/mo list price

Zepbound

20–22%

avg. body-weight loss

The same tirzepatide as Mounjaro, approved specifically for weight management. In trials it delivers the highest average weight loss of any GLP-1 you can get today.

$1,060/mo list price

Mounjaro might be your match if…

Your plan covers it but not Zepbound — let coverage lead.
A longer track record puts you at ease (it’s been around since 2022).
You’re already doing well on Tirzepatide and would rather not switch.

Zepbound might be your match if…

The strongest possible weight loss is your top priority (20–22%).
You’re drawn to its dual glp-1/gip receptor agonist approach.
Your plan covers Zepbound (or its weight-loss version).

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Questions people ask us about these two

Often, yes — but it's a move to make with your doctor, not on your own, especially since these use different active ingredients (Tirzepatide vs Tirzepatide). Your prescriber will set a sensible starting dose and step you up gradually so your body has time to adjust.

In studies, Mounjaro averages about 15–22% of body weight and Zepbound averages about 20–22%. Those are averages, though — your own results hinge on your dose, your habits around food and movement, and your metabolism, so treat the numbers as a guide rather than a promise.

At full list price, Mounjaro runs roughly $1,023/mo and Zepbound about $1,060/mo. But list price is rarely what people actually pay — once insurance, manufacturer savings, or a cash-pay program enter the picture, your real cost can look very different.

They're cut from the same cloth, so both can bring on stomach-related effects like nausea, diarrhea, or constipation, usually most noticeable early on as your dose climbs. How strong those effects feel can differ from person to person, which is one more reason to talk through your history with your doctor.

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