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Someone posted that they’re trying to use a discount card for Mounjaro at Costco in Canada, but the store’s register still shows a $0 discount. They say Costco added the card to their account, and it used to work, but after the drug company sent a replacement card it stopped applying the discount. They’re asking what Costco needs to do so the discount actually shows up. Mounjaro is a prescription diabetes medicine (its active ingredient is tirzepatide). It’s a manufactured drug, not a vitamin or herb. Some drug makers run patient-support programs or savings cards that lower your out‑of‑pocket cost at the pharmacy. Those cards usually require the pharmacy to enter a card number or select a specific payer in their system so the discount can be applied at checkout. The situation described is about how a pharmacy’s computer system links the card to the transaction. This report is a single customer trying to use a renewed card; it’s not a formal study or broad survey. Often the problem is administrative: the new card may need to be activated, the pharmacy needs to update the card number in the patient profile, or the pharmacist has to bill the card as a secondary payer so the system calculates the discount. Sometimes replacements use a different BIN/PCN/ID (technical routing numbers for pharmacy claims) that the pharmacy must add. The post doesn’t say what Costco told them, what the card company said, or whether other customers have the same issue, so we can’t say how common this is. Why this matters: prescription discounts can make an expensive medicine much more affordable, so getting the card to work could save the person a lot of money each refill. People who rely on Mounjaro or similar drugs — for diabetes or off‑label weight management under a doctor’s guidance — would care about straightforward ways to use manufacturer savings. For anyone facing the same problem, knowing it’s likely an activation or pharmacy-entry issue helps you ask the right questions when you call your local pharmacy or the support line on the card. Caveats and risks: this report is anecdotal and specific to one pharmacy chain and one replacement card. Don’t assume every Costco or every pharmacy will have the same fix. Manufacturer savings cards often have rules: they may not be valid with government insurance plans, or they may cap the discount. Some programs require you to enroll or to have the prescriber sign certain forms. Also, using a savings card is different from insurance — it’s a short-term discount, not ongoing coverage. If you have chronic conditions, check with your prescriber and insurer before relying on a card. If a pharmacy can’t resolve it, contact the card’s support line and keep receipts in case of later reimbursement. Bottom line: this looks like an activation or data-entry hiccup — call the card support and your Costco pharmacy, have the new card details ready, and ask them to enter it as the secondary payer or update the patient profile so the discount can apply.
Source: r/Mounjaro