GLP Watchdog

Mounjaro vs Zepbound: One Drug, Two Labels

Mounjaro (tirzepatide, Eli Lilly) vs Zepbound (tirzepatide, Eli Lilly)

Last verified November 2026

By Ruth Calder · Enforcement Editor
Editorially reviewed. Not medical advice · How we verify contentLast reviewed

The verdict

The same molecule, dose ladder and maker, sold under two names. Type 2 diabetes, with a cardiovascular risk-reduction indication added after SURPASS-CVOT, sits on the Mounjaro label; obesity and sleep apnea sit on Zepbound's. Their cash routes differ: Zepbound KwikPens cost $299–$449 a month through LillyDirect, while LillyDirect lists Mounjaro at $499 a month at every strength. The practical difference is which label your prescription is written against, because that is what decides coverage. Nothing pharmacological separates them, and any page implying otherwise is selling something.

Side-by-side comparison

Mounjaro vs Zepbound, side by side
FieldMounjaroZepbound
Active ingredientTirzepatideTirzepatide
FDA-labeled indicationType 2 diabetes mellitusChronic weight management; obstructive sleep apnea (Dec 2024)
Pivotal trial weight-loss anchor−11.2 kg / 40 weeks (SURPASS-2, 15 mg vs semaglutide)−20.9% TBWL / 72 weeks (SURMOUNT-1, 15 mg)
MechanismDual GIP / GLP-1 receptor agonistDual GIP / GLP-1 receptor agonist
Available doses2.5, 5, 7.5, 10, 12.5, 15 mg (pen + KwikPen + vial)2.5, 5, 7.5, 10, 12.5, 15 mg (pen + KwikPen + vial)
Cash price (LillyDirect direct-pay)$499 at every strength$299–$449 (KwikPen; $499–$699 if a refill lapses)
Commercial insurance PA criteriaA1c ≥6.5% + metformin trial; T2D benefitBMI ≥30 (or ≥27 + comorbidity); obesity benefit (often excluded)
Form factorSingle-dose pen, KwikPen, single-dose vialSingle-dose pen, KwikPen, single-dose vial

What each one costs in the compounded market

Standing monthly cash prices from the 734 sellers on this register. These are compounded preparations, not the approved products compared above.

Mounjaro and Zepbound — tirzepatide

from $69 /mo

453 sellers publish a standing price. This is the lowest of all 453; the median is $228.28 a month.

Where to get tirzepatide — a selection of sellers, not a price ranking

⚠ A compounded preparation is not the approved product. No agency has reviewed that specific preparation for safety, effectiveness or manufacturing quality, and the legal ground under compounding these molecules narrowed when the shortages closed. The price gap is real, and so is the difference in oversight. Every seller, with its price record.

Frequently asked questions

Are Mounjaro and Zepbound the same drug?

Chemically, yes — both are tirzepatide. They are sold under different names for different approved uses, and usually at different doses and different prices. That is a labeling and commercial distinction, not a pharmacological one, which is why a prescription for one is not automatically interchangeable with the other at the pharmacy counter.

Is Mounjaro or Zepbound cheaper?

On the manufacturers' own cash pricing: Mounjaro at $499 at every strength, Zepbound at $299–$449 (KwikPen; $499–$699 if a refill lapses). That is the list-price comparison, and it is not what most people pay. What you actually pay depends on whether your plan covers it, which formulary tier it sits in, and whether you have met your deductible — and for many people the honest comparison is between an insured copay and a cash-pay compounded alternative rather than between these two figures.

What does a compounded version of each actually cost?

Compounders sell the molecule, not either brand, so one figure covers both: across the 734 sellers in this register, the cheapest standing monthly cash price we hold for compounded tirzepatide is $69 a month. A compounded preparation is not the approved product: no agency has reviewed that specific preparation for safety, effectiveness or manufacturing quality, and the legal ground under compounding these molecules narrowed once the shortages closed. The price gap is real and so is the difference in oversight.

Can I switch from Mounjaro to Zepbound?

People move between them regularly, since it is the same molecule — but the dose ladders differ, so a prescriber has to map where you land rather than matching the number. Do not assume your current dose transfers.

Which one should I ask for?

That is a prescriber's call, and anyone answering it from a table is guessing. What a page like this can do is tell you what the trials measured, what the manufacturers charge, and where the evidence is still missing, so the conversation starts from the record rather than from an advertisement.

References

  1. 1.Frías JP, Davies MJ, Rosenstock J, et al. Tirzepatide versus Semaglutide Once Weekly in Patients with Type 2 Diabetes (SURPASS-2). N Engl J Med. 2021. PMID: 34170647.
  2. 2.Jastreboff AM, Aronne LJ, Ahmad NN, et al. Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1). N Engl J Med. 2022. PMID: 35658024.
  3. 3.Malhotra A, Grunstein RR, Fietze I, et al. Tirzepatide for the Treatment of Obstructive Sleep Apnea and Obesity (SURMOUNT-OSA). N Engl J Med. 2024. PMID: 38912654.
  4. 4.Eli Lilly and Company. Mounjaro (tirzepatide) injection — FDA prescribing information. DailyMed. 2025. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=d2d7da5d-ad07-4228-955f-cf7e355c8cc0
  5. 5.Eli Lilly and Company. Zepbound (tirzepatide) injection — FDA prescribing information. DailyMed. 2025. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=487cd7e7-434c-4925-99fa-aa80b1cc776b
  6. 6.Eli Lilly and Company. Zepbound self-pay pricing on LillyDirect — $299 (2.5 mg), $399 (5 mg), $449 (7.5–15 mg) when refilled within 45 days. LillyDirect. 2026. https://www.lilly.com/lillydirect/zepbound

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