Mounjaro Cost at Costco in 2026: Real Pricing Breakdown

Introduction

Mounjaro® at Costco pharmacy runs about $1,020 to $1,069 per month in May 2026 for a 28-day box of four pens. That’s $30 to $80 below the average Walgreens or CVS cash price, which makes Costco one of the cheaper retail options for paying cash. The pharmacy honors the Costco Member Prescription Program discount on top of insurance copays, and the Lilly Mounjaro savings card works at Costco pharmacies nationwide.

You don’t need a Costco membership to use the pharmacy. Federal law requires Costco to fill prescriptions for any walk-in customer. That said, the Member Prescription Program (free for members) does add small discounts on some medications, and Costco’s general pharmacy pricing tends to run lower than competitors regardless.

This guide covers what Mounjaro actually costs at Costco in 2026, when the savings card works, and how Costco compares to mail-order and direct-to-consumer alternatives.

At TrimRx, we believe that understanding your options is the first step toward a more manageable health journey. You can take the free assessment quiz if you’re ready to see whether a personalized program is a fit for you.

How Much Does Mounjaro Cost at Costco Without Insurance in 2026?

Without insurance, Mounjaro at Costco costs around $1,020 to $1,069 per month for a 28-day supply. That’s the Lilly wholesale price plus Costco’s typical low dispensing margin. Costco operates pharmacy at near-break-even as a member loyalty driver, which is why their cash prices on brand drugs tend to run lower than chains like CVS and Walgreens.

Quick Answer: Mounjaro cash price at Costco is roughly $1,020 to $1,069 per month, slightly below most major chains

The price doesn’t change by dose. Lilly flat-prices all Mounjaro strengths (2.5 mg through 15 mg), so a patient starting at 2.5 mg pays the same as someone on 15 mg. This intentional pricing keeps titration affordable for diabetes patients building up to a maintenance dose.

Annual cash cost at Costco runs about $12,250 to $12,830. That’s $400 to $1,000 below annual cost at Walgreens or CVS, but still steep enough that most uninsured patients look at alternatives.

Do I Need a Costco Membership to Fill Mounjaro?

No. Costco pharmacies are required by federal law to serve non-members. You can walk into any Costco pharmacy, hand over a prescription, and pay without showing a membership card. The pharmacy entrance at most stores has a separate path that bypasses the warehouse entrance check.

What members get is access to the Costco Member Prescription Program (CMPP), which adds small discounts on certain medications. Mounjaro isn’t typically on the CMPP discount list because brand-name GLP-1s have minimal pricing flexibility. Members and non-members pay essentially the same cash price for Mounjaro.

The membership pays off elsewhere: Costco’s pet medications, generic drugs, and over-the-counter supplements all see deeper member discounts. For Mounjaro specifically, membership doesn’t matter.

Does the Lilly Mounjaro Savings Card Work at Costco?

Yes. The Lilly Mounjaro Savings Card is accepted at Costco pharmacies nationwide. With commercial insurance covering Mounjaro for type 2 diabetes, eligible patients pay as little as $25 per month. The card caps total savings at $150 per month, so it has the most impact when stacked with decent insurance coverage.

The card requires a type 2 diabetes diagnosis. Patients prescribed Mounjaro off-label for weight loss don’t qualify, regardless of insurance status. Government insurance (Medicare, Medicaid, TRICARE, VA) also disqualifies patients from the savings card.

For commercially insured diabetes patients, the card combined with Costco’s already-lower cash pricing is one of the best Mounjaro deals available at any retail pharmacy.

What Does Mounjaro Cost at Costco with Insurance in 2026?

With commercial insurance covering Mounjaro for type 2 diabetes, copays at Costco typically run $25 to $90 per month. Most commercial formularies place Mounjaro on Tier 3, with copay structures varying by plan. A flat $50 copay is common. Plans using coinsurance (a percentage of the drug cost) come out higher.

Stacking the Lilly savings card on insurance brings most commercially insured diabetes patients to $25 per month, which is the lowest sustainable out-of-pocket cost Costco offers. The card pays whatever the insurance doesn’t cover, up to the monthly cap.

Medicare Part D plans cover Mounjaro for diabetes with varying copays. The 2024 KFF analysis of Part D GLP-1 coverage found average copays of $58 to $410 per month depending on plan tier. Costco often shows up as a preferred pharmacy for several large Medicare Part D plans, which can drop copays $10 to $30 below other retailers.

Is Mounjaro Covered for Weight Loss at Costco?

Mounjaro is FDA-approved for type 2 diabetes only, so insurance won’t cover it for weight loss at Costco or any other pharmacy. Patients seeking tirzepatide for obesity need a Zepbound® prescription, the FDA-approved version for chronic weight management (approved November 2023).

The SURMOUNT-1 trial (Jastreboff et al. 2022 NEJM) demonstrated tirzepatide 15 mg produced 20.9% average weight loss at 72 weeks. That trial data drove the Zepbound approval and changed how most insurers handle weight-loss coverage for tirzepatide.

Costco pharmacy will fill any valid Mounjaro prescription regardless of indication, but uninsured cash price applies if insurance denies the off-label claim.

How Does Costco Compare to Other Pharmacies for Mounjaro Pricing?

Costco’s cash price for Mounjaro is typically $30 to $100 below CVS, Walgreens, and Rite Aid. Sam’s Club runs at similar pricing to Costco. Walmart sits between the warehouse clubs and the major drugstore chains. None of the retail options come close to LillyDirect’s Zepbound vial pricing ($399 to $499 monthly) or compounded telehealth options.

The cash-price ranking at most major retailers in 2026 roughly looks like: Costco and Sam’s Club ($1,020 to $1,069), Walmart ($1,030 to $1,080), CVS and Walgreens ($1,069 to $1,135), Rite Aid ($1,080 to $1,140), independent pharmacies (varies widely, $1,050 to $1,200+).

For insured diabetes patients with the Lilly savings card, all retailers end up at the same $25 monthly price, so location convenience matters more than retailer choice.

Key Takeaway: The Lilly Mounjaro Savings Card brings eligible diabetes patients to $25 per month at Costco

What Are Cheaper Alternatives to Mounjaro at Costco?

The main alternatives in 2026 are Zepbound vials through LillyDirect, compounded tirzepatide through licensed telehealth, and compounded semaglutide. Each has tradeoffs in cost, convenience, and clinical risk.

Zepbound vials from LillyDirect ship for $399 to $499 per month direct to patients without insurance involvement. The vials require self-drawing into a syringe rather than a prefilled pen, but the active molecule is identical to Mounjaro. Lilly built this channel specifically for cash-paying weight-loss patients.

Compounded tirzepatide from 503A pharmacies became more restricted after the FDA removed tirzepatide from the shortage list in October 2024. Some telehealth providers still offer it under individual medical necessity documentation, with monthly costs from $199 to $499. Compounded semaglutide remains more available, typically $179 to $349 per month. TrimRx offers a free assessment quiz to determine which option fits a patient’s goals and medical history.

Does Costco Offer Mail-order Mounjaro?

Yes. Costco Mail Order Pharmacy fills Mounjaro for both Costco members and non-members at the same cash price as in-store. Some commercial insurance plans also route to Costco Mail Order with 90-day fills at lower copays.

Mail order doesn’t deliver a meaningful discount on Mounjaro for cash payers. The drug arrives at the same Lilly-set list price, with maybe $5 to $15 in shipping savings versus driving to the warehouse. For insured patients with 90-day fills allowed, mail order can drop the per-month copay by $5 to $20.

Cold-chain shipping is required since Mounjaro pens need refrigeration. Costco Mail Order Pharmacy uses overnight refrigerated shipping, which adds a delivery window patients need to plan around.

Can I Use HSA or FSA for Mounjaro at Costco?

Yes, with a valid type 2 diabetes prescription. HSA and FSA funds cover prescription drugs at Costco pharmacy, and the benefits card runs through at checkout like any other pharmacy. Using pre-tax dollars saves 22% to 37% depending on your federal tax bracket.

Off-label use for weight loss is murkier. IRS Publication 502 allows HSA spending on weight-loss medications only when a physician has diagnosed obesity (BMI 30+) or a weight-related comorbidity. Documentation through a Letter of Medical Necessity is usually required for the HSA administrator to honor the claim.

Costco’s pharmacy receipts are HSA-friendly and clearly list the prescription drug for reimbursement purposes.

Will Mounjaro Be in Stock at My Local Costco?

Most Costco pharmacies stock the common Mounjaro doses (2.5 mg, 5 mg, 7.5 mg, 10 mg) consistently in 2026. Higher doses (12.5 mg, 15 mg) sometimes require a 1 to 3 day special order. Costco’s regional pharmacy distribution is generally efficient, and the chain doesn’t see the same routine stockouts that smaller pharmacies sometimes report.

The 2023-2024 tirzepatide shortage that drove patients to hunt for stock across multiple states has been resolved since October 2024 per FDA designation. Costco pharmacies now reliably fill Mounjaro prescriptions, though calling ahead remains a smart move for higher doses.

If your local Costco is out, the pharmacist can transfer the prescription to another nearby Costco or order through the chain’s central fulfillment.

How Long Is a Costco Mounjaro Prescription Valid?

A Mounjaro prescription from a U.S. licensed prescriber is valid for one year from the date written, with up to 5 refills if the prescriber authorized them. Costco honors any unexpired prescription transferred from another pharmacy and can pull electronic prescriptions sent directly from a prescriber’s office.

Telehealth prescriptions for Mounjaro are valid at Costco the same as any in-person prescription. Patients sometimes worry that telehealth scripts get rejected, but as long as the prescriber is licensed in the patient’s state and the prescription is appropriately documented, Costco fills it without issue.

Bottom line: Compounded tirzepatide through telehealth runs $199 to $499 monthly, well below any retail option

FAQ

Is Costco Cheaper Than Sam’s Club for Mounjaro?

Costco and Sam’s Club price Mounjaro within $10 to $30 of each other in most regions. Neither has a clear pricing edge. Both warehouse club pharmacies serve members and non-members under federal pharmacy rules. Choose based on which has better hours or location for you.

Does Costco Accept GoodRx for Mounjaro?

Costco accepts GoodRx coupons, but GoodRx pricing for Mounjaro is essentially the same as Costco’s cash price. Lilly’s contracts prevent third-party discount programs from offering real savings on brand-name GLP-1s. Don’t expect a GoodRx coupon to drop the price at Costco below the standard cash rate.

Can I Get Mounjaro at Costco with a Medicaid Card?

Costco pharmacy accepts state Medicaid for Mounjaro when the patient has a covered type 2 diabetes diagnosis with appropriate prior authorization. Coverage rules vary state by state. Off-label weight-loss use isn’t covered by any Medicaid program.

Does Costco Price Mounjaro Lower for Cash Than Through Insurance?

Sometimes. If your insurance copay is higher than Costco’s cash price (rare but possible with high-deductible plans), you can ask the pharmacist to run it as cash. The Lilly savings card works with cash transactions but caps savings at $150 monthly.

What If My Costco Doesn’t Carry the Dose I Need?

Ask the pharmacist to special order it or transfer the script to another Costco location with stock. Costco’s central distribution typically fulfills within 1 to 3 business days. Patients near end-of-fill can sometimes get a partial dispense to bridge.

How Do I Switch From Mounjaro to Compounded Tirzepatide?

A licensed prescriber needs to evaluate medical necessity for compounded tirzepatide and write a new prescription routed to a 503A compounding pharmacy. TrimRx offers a free assessment quiz to match patients with a personalized treatment plan, and can route eligible patients to telehealth providers offering compounded GLP-1 options.

Disclaimer: This content is for informational purposes only and does not constitute medical advice. It is not intended to diagnose, treat, cure, or prevent any disease or condition. Individual results may vary. Always consult a qualified healthcare professional before starting any weight loss program or medication.