Mounjaro vs Zepbound: what’s the difference?
Mounjaro and Zepbound are the same medicine, tirzepatide, made by Eli Lilly. The difference is their US approval: Mounjaro treats type 2 diabetes in adults and children 10 and older, while Zepbound is for weight management and obstructive sleep apnea in adults. That approval decides how insurance treats each one.
Is the medicine inside the same?
Yes. Both are weekly injections of tirzepatide, in the same strengths from 2.5 mg to 15 mg.1,2
Mounjaro’s US label covers blood-sugar control in type 2 diabetes for adults and children 10 and older, and lowering the risk of heart attack, stroke and heart death in adults with type 2 diabetes at high risk.1
Zepbound’s label covers weight loss and keeping it off in adults with obesity, or overweight plus a weight-related condition, and moderate-to-severe obstructive sleep apnea in adults with obesity.2 Because they are the same drug, the Zepbound label says not to use it with other tirzepatide products.2
Why does coverage differ?
Insurers decide coverage by the approved use, and US rules treat diabetes and weight loss differently.
Medicare Part D plans can cover GLP‑1s for type 2 diabetes but, by law, not for weight loss.3 Medicare’s temporary GLP‑1 Bridge covers the Zepbound KwikPen for weight at $50 a month, but not Mounjaro.5
State Medicaid programs must cover these drugs for diabetes and, since December 2024, Zepbound for sleep apnea; weight-loss coverage is optional.4 On October 12, 2026 the government site TrumpRx.gov showed Zepbound’s undiscounted price as $1,087 a month.6 Self-pay prices are in How much is Zepbound without insurance?
Do they work differently?
The trials differ. Zepbound’s weight results come from people with and without diabetes, Mounjaro’s from people with type 2 diabetes.1,2
In Zepbound’s main 72-week trial in adults without diabetes, weight fell 20.9% on 15 mg, against 3.1% on a placebo (dummy injection). In adults with type 2 diabetes it fell 14.7% on 15 mg, against 3.2%. These are averages: some people lost more, some less.2
People with diabetes taking tirzepatide alongside insulin or a sulfonylurea have a higher risk of low blood sugar, and their dose of those drugs may need lowering.1 How these medicines work is in Guide 2.
- Stomach effects are common. On Zepbound 15 mg, 28 in 100 people had nausea, against 8 in 100 on a placebo (dummy injection), in the US weight trials.2
- Pancreas and gallbladder. Both labels warn of pancreatitis (inflammation of the pancreas) and gallbladder problems.1,2
- Thyroid warning. Neither should be used with a personal or family history of medullary thyroid carcinoma (a rare thyroid cancer), or with MEN 2 (multiple endocrine neoplasia type 2, an inherited condition that causes gland tumors).1,2
- Birth control pills. The Zepbound label advises a non-oral or added barrier method for 4 weeks after starting and after each dose increase.2
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Related questions
Sources
- Eli Lilly. Mounjaro (tirzepatide) US prescribing information and Medication Guide, revised 08/2026, section 1. US label. uspl.lilly.com
- Eli Lilly. Zepbound (tirzepatide) US prescribing information, Medication Guide and Instructions for Use, revised 08/2026. US label. uspl.lilly.com
- KFF. What to know about the BALANCE Model for GLP-1s in Medicare and Medicaid and the Medicare GLP-1 Bridge. Updated May 11, 2026. kff.org
- KFF. Medicaid coverage of and spending on GLP-1s. Jan 16, 2026. kff.org
- Centers for Medicare & Medicaid Services (CMS). Medicare GLP-1 Bridge: information for prescribers. CMS Product No. 12235, June 2026. cms.gov (PDF)
- TrumpRx.gov (US federal government website). GLP‑1 listings: Wegovy pill $149/mo, Wegovy pen $199/mo, Ozempic $199/mo, Zepbound $299/mo, each shown next to an “original price” of $1,349, $1,349, $1,028 and $1,087. Checked Oct 12, 2026. trumprx.gov
Last checked Oct 12, 2026 · Next review due Oct 12, 2027 · Report an error
How this answer was made. Written by the GLP Guidebook team from the sources above, all checked on Oct 12, 2026. It’s general information, not medical advice. Talk to a doctor, pharmacist or other licensed prescriber before starting, stopping or changing any medicine. In an emergency, call 911. How we write