If you have been looking into the Mounjaro cost at Costco Canada, you are not alone. Tirzepatide (the active ingredient in Mounjaro) has quickly become one of the most talked-about GLP-1 medications in the country, and Canadians are searching for the best pharmacy pricing. Costco pharmacies have built a reputation for lower prescription costs across the board, and Mounjaro is no exception. In this guide, I will walk through what you can expect to pay at Costco for each Mounjaro dose, whether you actually need a membership, how Costco stacks up against Shoppers Drug Mart and Walmart, and practical ways to bring your out-of-pocket costs down.

Let's break it down.

How Much Does Mounjaro Cost at Costco Canada in 2026?

Costco pharmacies across Canada tend to price Mounjaro lower than most retail chains. The reason is straightforward: Costco operates its pharmacies on thin margins and passes a larger portion of savings to customers. Pricing can still vary by province and by location, but here is a general breakdown of what Canadians are paying in 2026. [1]

Table 1: Costco Mounjaro Pricing by Dose (2026 Estimates)

| Mounjaro Dose | Pens Per Box | Costco Price (Approx.) | Cost Per Pen |

|---|---|---|---|

| 2.5 mg | 4 pens | $290 - $320 | $72.50 - $80.00 |

| 5 mg | 4 pens | $290 - $320 | $72.50 - $80.00 |

| 7.5 mg | 4 pens | $290 - $320 | $72.50 - $80.00 |

| 10 mg | 4 pens | $290 - $320 | $72.50 - $80.00 |

| 12.5 mg | 4 pens | $290 - $320 | $72.50 - $80.00 |

| 15 mg | 4 pens | $290 - $320 | $72.50 - $80.00 |

Mounjaro uses a flat pricing structure in Canada. Unlike some medications where higher doses cost more, Eli Lilly has kept the price consistent across all six dose levels. Each box contains four single-use pens, which covers one month of weekly injections. [2]

The prices listed above reflect cash-pay pricing without insurance. If you have private drug coverage, your co-pay will depend on your plan. For a full look at coverage options, check out our Mounjaro insurance coverage page. [3]

Note: Costco pharmacy dispensing fees vary by province. In Ontario, Costco charges one of the lowest dispensing fees in the country, often around $4.49 per prescription. Alberta and British Columbia dispensing fees may differ. Always confirm the total at your local Costco pharmacy counter.

Do You Need a Costco Membership to Use the Pharmacy?

This is probably the most common question I get about filling prescriptions at Costco. The answer might surprise you.

In most Canadian provinces, you do not need a Costco membership to use the pharmacy. Provincial pharmacy regulations in several provinces require that pharmacies remain accessible to the public regardless of membership models. That said, the rules are not identical everywhere. [4]

Table 2: Costco Membership Rules for Pharmacy Access by Province

| Province | Membership Required for Pharmacy? | Notes |

|---|---|---|

| Ontario | No | Provincial regulation requires open access |

| British Columbia | No | Open to all; no membership card needed |

| Alberta | No | Pharmacy is publicly accessible |

| Quebec | No | Pharmacies must serve all residents |

| Manitoba | No | No membership needed for prescriptions |

| Saskatchewan | No | Open access pharmacy |

| Nova Scotia | No | Provincial pharmacy regulations apply |

| New Brunswick | No | Open to the public |

| Newfoundland & Labrador | No | No membership restriction |

| Prince Edward Island | No | Open pharmacy access |

In practice, you walk into any Costco location, head to the pharmacy counter at the back, and hand over your prescription. The staff will not ask for a membership card. You may need to show your provincial health card and a valid photo ID, but the Costco membership itself is not a barrier.

That said, having a membership does give you access to the rest of the store and to Costco's optical department, which operates under different rules. If you are only there for the pharmacy, save your $65 annual fee.

For more details on getting your prescription, visit our guide on how to get Mounjaro in Canada.

Costco vs Other Canadian Pharmacies: Mounjaro Price Comparison

Price shopping for prescriptions is completely normal in Canada. There is no regulation that forces all pharmacies to charge the same amount for a given drug. Markup percentages and dispensing fees vary, and those differences add up fast on a medication you take every single week.

Table 3: Mounjaro Cost Comparison Across Canadian Pharmacies (2026 Estimates)

| Pharmacy | Approx. Monthly Cost (Any Dose) | Dispensing Fee (Ontario) | Total Estimated Monthly Cost |

|---|---|---|---|

| Costco | $290 - $320 | $4.49 | $294.49 - $324.49 |

| Shoppers Drug Mart | $310 - $350 | $11.99 - $12.99 | $321.99 - $362.99 |

| Walmart Pharmacy | $300 - $340 | $9.97 | $309.97 - $349.97 |

| Rexall | $310 - $345 | $11.49 | $321.49 - $356.49 |

| Independent Pharmacy | $305 - $360 | $8.00 - $14.00 | $313.00 - $374.00 |

| Online Pharmacy (Canadian) | $285 - $330 | $0 - $5.00 | $285.00 - $335.00 |

A few things jump out from this comparison.

First, Costco's dispensing fee in Ontario is dramatically lower than Shoppers Drug Mart. Over a full year, that dispensing fee difference alone could save you $90 or more. Second, online Canadian pharmacies sometimes match or beat Costco's drug cost, but availability can be inconsistent for newer medications like Mounjaro. [5]

The bottom line: Costco is consistently among the cheapest brick-and-mortar options for Mounjaro in Canada. If you are paying out of pocket and there is a Costco nearby, it is worth the trip.

Curious about other ways to lower your tirzepatide costs? See our breakdown of the cheapest tirzepatide options in Canada.

Full Titration Schedule: What Mounjaro Costs at Costco Over Time

Mounjaro follows a structured dose escalation (titration) schedule. You start at 2.5 mg and increase every four weeks, based on your prescriber's guidance, until you reach a maintenance dose. Most patients stabilize between 5 mg and 15 mg.

Here is what the full titration looks like at Costco pricing, assuming you move up one dose level every month.

Table 4: Full Mounjaro Titration Cost at Costco Canada

| Month | Dose | Costco Estimated Cost |

|---|---|---|

| Month 1 | 2.5 mg | $305 |

| Month 2 | 5 mg | $305 |

| Month 3 | 7.5 mg | $305 |

| Month 4 | 10 mg | $305 |

| Month 5 | 12.5 mg | $305 |

| Month 6 | 15 mg | $305 |

| 6-Month Total | | $1,830 |

| 12-Month Total (at maintenance) | | $3,660 |

Because Mounjaro uses flat pricing across doses, the monthly cost stays the same whether you are on 2.5 mg or 15 mg. This is different from some other GLP-1 medications where higher doses carry higher price tags.

The 12-month estimate assumes six months of titration followed by six months at your maintenance dose, all at Costco pricing with an average dispensing fee included.

For a broader look at costs across all pharmacies and provinces, visit our detailed Mounjaro cost guide.

Costco Pharmacy Locations Across Canada

Costco operates pharmacies in nearly all of its Canadian warehouse locations. The company has expanded steadily across provinces, and most major cities now have at least one Costco pharmacy within driving distance.

Table 5: Costco Warehouse Locations by Province (2026)

| Province | Approx. Number of Costco Locations | Major Cities With Costco Pharmacy |

|---|---|---|

| Ontario | 38 | Toronto, Ottawa, Hamilton, London, Mississauga |

| Quebec | 23 | Montreal, Quebec City, Laval, Gatineau |

| British Columbia | 16 | Vancouver, Surrey, Burnaby, Victoria, Kelowna |

| Alberta | 17 | Calgary, Edmonton, Red Deer, Lethbridge |

| Manitoba | 4 | Winnipeg |

| Saskatchewan | 3 | Saskatoon, Regina |

| Nova Scotia | 2 | Halifax, Dartmouth |

| New Brunswick | 2 | Moncton, Fredericton |

| Newfoundland & Labrador | 1 | St. John's |

| Prince Edward Island | 0 | N/A (nearest: Moncton, NB) |

If you live in PEI, your closest Costco pharmacy is across the Confederation Bridge in Moncton. For everyone else, there is likely a Costco pharmacy within a reasonable drive.

I recommend calling your local Costco pharmacy ahead of your visit to confirm they have Mounjaro in stock. Supply disruptions have been less frequent in 2026 than in previous years, but checking ahead saves a wasted trip.

How to Save Money on Mounjaro at Costco Canada

Even at Costco's already-competitive pricing, there are steps you can take to reduce your costs further.

1. Ask About the Eli Lilly Patient Support Program

Eli Lilly runs a patient assistance program in Canada for Mounjaro. Eligibility criteria change, but in general, patients without private insurance or those facing high co-pays may qualify for financial support. Ask your prescriber or the Costco pharmacist about current offerings.

2. Check Your Provincial Formulary

Some provinces have added tirzepatide to their formularies with specific criteria. If you have a diagnosis of type 2 diabetes (Mounjaro's approved indication in Canada), you may qualify for partial provincial coverage. This is separate from private insurance and applies to your provincial drug plan. [6]

3. Stack Employer Benefits

If you have private insurance through your employer, submit your Costco receipt for reimbursement. Even partial coverage on a $305 prescription makes a real difference over 12 months. Some plans cover 80% of the drug cost, which brings your monthly out-of-pocket to roughly $60 to $65.

4. Buy in Advance When Possible

Some Costco pharmacies allow you to fill a 90-day supply if your prescriber writes the prescription accordingly. A three-month fill means one dispensing fee instead of three. In Ontario, that saves you about $9 per quarter, or $36 per year. It is not a fortune, but it adds up.

5. Compare With Online Pharmacies

Canadian online pharmacies sometimes offer competitive pricing on Mounjaro. If your province allows it, getting quotes from a licensed online pharmacy and comparing with Costco can help you find the lowest price. Just make sure any online pharmacy you use is licensed in your province.

Mounjaro at Costco vs Ozempic at Costco

Many Canadians compare Mounjaro (tirzepatide) with Ozempic (semaglutide) when choosing a GLP-1 medication. Both are available at Costco pharmacies. Ozempic has been on the Canadian market longer and tends to have more consistent stock, but Mounjaro's dual-action mechanism (targeting both GIP and GLP-1 receptors) has shown slightly greater average weight loss in clinical trials. [7]

From a pricing standpoint, Ozempic and Mounjaro are in a similar range at Costco, though Ozempic's cost does increase at higher doses while Mounjaro stays flat. For a direct comparison, check out our Ozempic at Costco guide.

The choice between the two is a conversation for you and your prescriber. What I can say is that Costco will give you competitive pricing on either one.

What to Bring to Your Costco Pharmacy Visit

If this is your first time filling a prescription at Costco, here is what you need:

  • A valid prescription from a Canadian-licensed physician or nurse practitioner
  • Your provincial health card (required in most provinces)
  • Photo ID (driver's license or passport)
  • Insurance information if you have private drug coverage (your group number and ID)
  • Patience for a first-visit consultation (the pharmacist will review the medication with you)

You do not need a Costco membership card. Walk in, go to the pharmacy, and you are good.

Potential Stock and Availability Issues

Mounjaro supply in Canada has improved in 2026 compared to the initial launch period. Eli Lilly has increased manufacturing capacity, and Health Canada's drug shortage database shows fewer tirzepatide alerts than in 2024 and 2025 (Health Canada Drug Shortage Database, Health Canada, 2026).

That said, specific doses can occasionally be back-ordered at individual Costco locations. The 2.5 mg starter dose and the 10 mg and 15 mg maintenance doses tend to be the most in-demand. If your local Costco is temporarily out, ask the pharmacist if another nearby location has stock, or whether they can order it in for you.

Frequently Asked Questions

Is Mounjaro cheaper at Costco than Shoppers Drug Mart?

Yes, in most cases. Costco's lower markup and dispensing fees mean you will typically pay $25 to $50 less per month compared to Shoppers Drug Mart. The exact savings depend on your province and the specific Shoppers location.

Can I use my insurance at a Costco pharmacy?

Absolutely. Costco pharmacies accept all major private insurance plans in Canada. Hand your insurance card to the pharmacist, and they will process the claim directly. Your co-pay will depend on your plan's coverage for tirzepatide.

Do I need a Costco membership to fill a prescription?

No. In all Canadian provinces, Costco pharmacies are open to non-members. You can walk in and fill your prescription without a membership card. This is required by provincial pharmacy regulations.

How much does a full year of Mounjaro cost at Costco?

Based on 2026 pricing, a full 12 months of Mounjaro at Costco runs approximately $3,660 before insurance, including dispensing fees. If you have 80% insurance coverage, your annual out-of-pocket drops to around $730 to $750.

Does Costco offer any discount programs for Mounjaro?

Costco itself does not run a separate discount program for specific medications. Your savings come from their lower markups and dispensing fees. For additional discounts, ask about the Eli Lilly patient assistance program or check if your province offers any subsidies for tirzepatide.

Can I transfer my Mounjaro prescription to Costco from another pharmacy?

Yes. Transferring a prescription to Costco is simple. Bring your current prescription label or bottle to the Costco pharmacy, and the pharmacist will handle the transfer. You can also ask your prescriber to send a new prescription directly to the Costco pharmacy of your choice.

The Bottom Line on Mounjaro Pricing at Costco

Costco remains one of the most affordable places to fill a Mounjaro prescription in Canada. Between lower drug markups, some of the lowest dispensing fees in the country, and no membership requirement for pharmacy access, it is a strong option for Canadians paying out of pocket or looking to reduce co-pays.

The flat pricing across all Mounjaro doses is a bonus that makes budgeting predictable throughout titration. Whether you are just starting at 2.5 mg or maintaining at 15 mg, the monthly cost stays steady.

If Costco is not convenient for you, compare with a licensed Canadian online pharmacy or check our guide to the cheapest tirzepatide options. And if you are still deciding between GLP-1 medications, our Mounjaro cost page covers everything from insurance to provincial formulary status.

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Sources

  • Eli Lilly Canada — Canadian site of the manufacturer of Mounjaro (tirzepatide), the authoritative source for product information, dose strengths and Canadian product availability.