Mounjaro costs $1,112.16 per month at list price. That’s the wholesale price Eli Lilly charges for a four-week supply (four injectable pens), and it’s the same regardless of your dosage strength. What you actually pay, though, depends heavily on your insurance, your diagnosis, and whether you qualify for discount programs. Some people pay as little as $25 a month, while others face the full price out of pocket.
The List Price vs. What You Actually Pay
Eli Lilly sets Mounjaro’s list price at $1,112.16 for one fill, which covers four pens (one month). This price applies equally whether you’re on the lowest 2.5 mg starting dose or the highest 15 mg dose. There’s no price increase as your doctor titrates you up.
That list price is what Lilly charges wholesalers, not necessarily what shows up at the pharmacy counter. Retail prices at major pharmacies tend to land close to that number for uninsured customers, typically ranging from roughly $1,050 to $1,100 depending on the pharmacy and any discount cards applied. Without insurance or a savings program, you’re looking at paying close to the full amount each month.
With Commercial Insurance
If you have employer-sponsored or marketplace insurance that covers Mounjaro, your copay could drop dramatically. Lilly offers a Mounjaro Savings Card that brings the cost down to as little as $25 per month for eligible patients with commercial insurance. The card works for both one-month and three-month supplies.
The catch is that your insurance plan needs to cover the drug in the first place, and most insurers require prior authorization before they’ll approve it. That process typically involves your doctor confirming several things: that you’re 18 or older, that you have a documented type 2 diabetes diagnosis, and that you’ve already tried other treatments first. Many plans require you to have tried metformin for at least three months, and some also require that you’ve tried other injectable diabetes medications like semaglutide before stepping up to Mounjaro. If your plan denies coverage, the savings card won’t help because it’s designed to reduce your share of an already-covered prescription, not replace insurance entirely.
Without Insurance
If you’re uninsured or your plan doesn’t cover Mounjaro, the situation is tougher. Lilly does not offer a traditional patient assistance program for uninsured patients seeking Mounjaro specifically. You’d be paying close to the full list price of $1,112 per month, which adds up to over $13,000 a year.
Pharmacy discount cards from third-party sites can sometimes shave a small percentage off, but the savings are modest compared to what insured patients get through the manufacturer’s program. Some patients explore whether Zepbound, which contains the same active ingredient (tirzepatide) but is approved for weight management rather than diabetes, offers better pricing. Zepbound’s retail cost can range from about $300 to $1,069 per month depending on dosage and pharmacy, potentially offering a lower entry point at certain strengths. However, Zepbound is only prescribed for weight loss, not diabetes, so it’s not a direct substitute depending on your medical situation.
Medicare and Medicaid Coverage
Medicare Part D plans can cover Mounjaro when it’s prescribed for type 2 diabetes, though formulary placement and copay amounts vary by plan. The more complicated question involves weight loss. Medicare has historically not covered drugs prescribed purely for weight management, but that’s starting to change.
Starting July 1, 2026, a new CMS demonstration program called the Medicare GLP-1 Bridge will provide coverage for certain weight loss medications, including Zepbound (the weight-loss version of tirzepatide). This program runs through December 2027 and requires prior authorization. To qualify, beneficiaries need a BMI of 35 or higher, or a BMI of 30 or higher with certain conditions like uncontrolled high blood pressure, heart failure, or chronic kidney disease, or a BMI of 27 or higher with pre-diabetes or a history of heart attack, stroke, or peripheral artery disease. Mounjaro itself isn’t listed under this bridge program since it’s approved for diabetes rather than weight loss, but the same molecule under the Zepbound brand is included.
Medicaid coverage for Mounjaro varies by state and typically requires a type 2 diabetes diagnosis with prior authorization.
Why the Diagnosis Matters for Price
The single biggest factor in what you’ll pay isn’t which pharmacy you choose. It’s why you’re taking Mounjaro. Insurance plans are far more likely to cover it for type 2 diabetes (its FDA-approved use) than for off-label weight loss. If your doctor prescribes Mounjaro for diabetes and your insurer approves it, you could pay $25 a month with the savings card. If you’re seeking it for weight management without a diabetes diagnosis, most insurers won’t cover it, and you’ll face the full price.
For weight loss specifically, Zepbound is the FDA-approved option using the same drug, and some insurance plans have separate coverage policies for it. Lilly has also periodically offered savings programs for Zepbound, so it’s worth checking both options with your insurer if weight management is your goal.
Monthly Cost at a Glance
- List price: $1,112.16 per month (all dosage strengths)
- With commercial insurance and savings card: as low as $25 per month
- With insurance but no savings card: varies widely by plan, typically a specialty-tier copay
- Without insurance: approximately $1,050 to $1,112 per month
Prices are flat across all dosage levels, so your monthly cost won’t increase as your doctor adjusts your dose upward during the typical titration schedule. The price you lock in at the 2.5 mg starting dose is the same you’ll pay at 10 mg or 15 mg.