Mounjaro vs Zepbound Cost Calculator

Same drug (tirzepatide), two brands, two pricing systems. Answer 2-3 questions to see your cheapest path.

Same drug, different access paths

Mounjaro and Zepbound contain the same active ingredient (tirzepatide). Mounjaro is FDA-approved for type 2 diabetes; Zepbound is approved for obesity and obstructive sleep apnea. Insurance, savings programs, and Lilly Direct apply differently to each.

What kind of insurance do you have?

Pricing reflects 2026 publicly listed programs

Prices are sourced from manufacturer programs (Lilly Mounjaro Zero, Zepbound Savings Card, Lilly Direct) and Medicare Part D averages as of May 2026. Real costs vary by plan, deductible, pharmacy, and dose. This tool is informational, not medical or financial advice.

What This Calculator Compares

Mounjaro and Zepbound contain the same active ingredient — tirzepatide, made by Eli Lilly — but they are sold under different brand names with different FDA indications. Mounjaro is approved for type 2 diabetes; Zepbound is approved for chronic weight management and obstructive sleep apnea. The brand you are eligible for, and how much you pay, depends almost entirely on your insurance type, your diagnosis, and whether your plan covers obesity medications. This calculator runs the numbers across four pricing paths: list price, the Mounjaro Zero card ($25/month for commercial-insured T2D patients), the Zepbound Savings Card ($25/month with obesity coverage; up to $469 off without), and Lilly Direct vials ($349/month cash-pay for Zepbound 2.5–10mg).

Who Is This For?

Anyone weighing Mounjaro vs Zepbound, anyone losing insurance coverage and wondering what it actually costs out-of-pocket, or anyone whose plan denies obesity meds and is comparing the savings card path against Lilly Direct. The result is informational — your real cost depends on your specific plan tier, deductible, pharmacy, and dose. Confirm with your prescriber, your insurance, and the manufacturer programs before counting on a number.

Frequently Asked Questions

Are Mounjaro and Zepbound the same drug?

Yes. Both contain tirzepatide, the same active molecule, made by Eli Lilly. The difference is FDA indication: Mounjaro is approved for type 2 diabetes; Zepbound is approved for chronic weight management and obstructive sleep apnea. Insurance, savings programs, and Lilly Direct apply differently to each brand.

Which is cheaper without insurance?

Zepbound, via Lilly Direct vials, at $349/month for doses 2.5–10mg ($499/month for 12.5–15mg). Mounjaro has no comparable cash-pay program — list price is $1,069/month. If you have no insurance, Zepbound vials are 3× cheaper.

What is the Mounjaro Zero card?

A manufacturer savings program from Eli Lilly that brings Mounjaro to $25/month for up to 13 fills per year. You qualify if you have commercial insurance AND a type 2 diabetes diagnosis — even if your plan denies coverage. Medicare, Medicaid, and uninsured patients are not eligible.

What is the Zepbound Savings Card?

A manufacturer savings program that depends on whether your plan covers obesity meds. With coverage: $25/month. Without coverage: up to $469 off list price (~$590/month effective). Maximum annual savings cap is $1,800. Commercial insurance only — not for Medicare or Medicaid.

Can I switch between Mounjaro and Zepbound mid-treatment?

The molecule is identical, so a switch should not change clinical effect. But your prescriber needs to write a new script for the correct brand based on your indication, and your insurance approval and savings program eligibility may reset. Always discuss switches with your prescriber and pharmacy.

Does Medicare cover Zepbound?

Not for obesity, as of 2026. Medicare Part D explicitly excludes anti-obesity medications. Medicare does cover Mounjaro for type 2 diabetes. Medicare beneficiaries with obesity but no diabetes generally have no covered tirzepatide path and must pay cash.

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These tools are for informational purposes only and do not constitute medical advice. Always consult your healthcare provider.