Zepbound vs Mounjaro

Zepbound vs Mounjaro: the short answer

They are the same molecule. Choose Zepbound if your goal is weight loss (it's the on-label option and has self-pay vial pricing); Mounjaro if you have type 2 diabetes and want the covered diabetes indication.

Both Zepbound and Mounjaro contain tirzepatide, so the core medicine is the same. The practical differences come down to approved use, target dose, and price.

On cost alone, Zepbound tends to be the cheaper option — its lowest realistic monthly price starts around $0, versus about $25 for Mounjaro.

How each medication works

Zepbound is a GIP/GLP-1 receptor agonist taken as a once-weekly subcutaneous injection. It is FDA-approved for Chronic weight management and Obstructive sleep apnea in obesity.

Mounjaro is a GIP/GLP-1 receptor agonist taken as a once-weekly subcutaneous injection. It is FDA-approved for Type 2 diabetes, and is also used off-label for weight loss and weight management.

Because they share the same active ingredient, the main dosing difference is the target maintenance dose: 5 mg, 10 mg, or 15 mg weekly for Zepbound versus 5 mg to 15 mg weekly for Mounjaro.

Effectiveness: average weight loss

In clinical data, Zepbound was associated with roughly 21% average body-weight reduction over about 72 weeks (SURMOUNT-1 trial (tirzepatide, highest dose)).

Mounjaro was associated with roughly 18% over about 40 weeks (Tirzepatide diabetes data (SURPASS); off-label for weight).

Head-to-head averages favor Zepbound, but individual results vary widely with dose, diet, activity, and how long you stay on treatment. These figures are trial averages, not guarantees.

Cost comparison

Zepbound: full cash price is around $1,086/mo. With a manufacturer savings program it can drop to about $349/mo, and telehealth routes run roughly $349–$599/mo.

Mounjaro: full cash price is around $1,069/mo. With savings it can drop to about $25/mo, and telehealth routes run roughly $349–$599/mo.

Use the cost calculator to plug in your insurance status and state — the cheapest route often depends on coverage far more than on which drug you pick.

Side effects and safety

The most common side effects overlap heavily: Zepbound lists nausea, diarrhea, vomiting, and constipation; Mounjaro lists nausea, diarrhea, vomiting, and constipation. Most are gastrointestinal and tend to ease as the dose is titrated up slowly.

Both carry serious warnings, including a boxed warning about the risk of thyroid C-cell tumors, and should not be used by people with a personal or family history of medullary thyroid carcinoma or MEN 2. Only a licensed clinician can decide whether either is appropriate for you.

Insurance and how to get each

Zepbound: Growing commercial coverage for obesity; not covered by traditional Medicare for weight loss. Prior authorization common.

Mounjaro: Often covered for type 2 diabetes; typically not covered when used off-label for weight loss.

If coverage is denied, most people compare a manufacturer savings program against a telehealth subscription or a compounded alternative where it is still legally available.

Which should you choose?

Since Zepbound and Mounjaro are the same molecule, the decision is usually about approval and access: pick the one your insurance is more likely to cover, or the one with the self-pay price that fits your budget.

Whichever you lean toward, run your specifics through the calculator and take our 60-second quiz to see which telehealth provider can actually get it to you for the least.