Drug facts
Compounded tirzepatide storage and beyond-use dating
Quick answer
The approved product is stored in a refrigerator at 2 °C to 8 °C (36 °F to 46 °F), and it may be kept at room temperature up to 30 °C (86 °F). How long depends on which container you have: 21 days for a single-dose pen or single-dose vial, 30 days for a multi-dose vial or a single-patient-use KwikPen. If it has been stored above 30 °C, the label says do not use it.
The approved storage range1
Refrigerated
- Temperature
- 2 °C – 8 °C (36 °F – 46 °F)
- How long
- Until the printed expiration date
Room temperature — single-dose pen or vial
- Temperature
- Up to 30 °C (86 °F)
- How long
- Up to 21 days, total
- If exceeded
- Do not use.
Room temperature — multi-dose vial or KwikPen
- Temperature
- Up to 30 °C (86 °F)
- Unopened
- Throw away after 30 days
- Once opened
- Throw away after 30 days at room temperature, 30 days after first use, or after four weekly doses — whichever comes first, even if there is medicine left in it.
- If exceeded
- Do not use.
Both clocks are totals, not a fresh allowance each time. Once the product has been out of the refrigerator, putting it back does not reset them.
Which number applies to you is worth getting right, because the two containers are not interchangeable. The 21-day figure is the one repeated most often online, and it is the one for a single-dose pen — which is not what a compounded seller ships. A compounded preparation almost always arrives as a multi-dose vial you draw several weeks of doses from, so the rules to read across are the 30-day ones, with the caveat in the next section: a compounded vial is not the approved product, and these figures describe the approved product.
Why a compounded vial is different1
On the label — Mounjaro / Zepbound
Carries an expiration date supported by stability data that FDA reviewed as part of approving the product.
In a compounded vial
Carries a beyond-use date instead. That is a date the compounding pharmacy assigns based on how the preparation was made and stored — a different kind of claim, resting on the pharmacy’s own standards rather than on an FDA-reviewed stability program for that exact preparation. Beyond-use dates are frequently much shorter than an approved product’s expiry, and they vary between pharmacies.
This is the clearest everyday example of what “no label” actually means. There is no single answer to how long a compounded vial keeps, because the answer belongs to the pharmacy that made yours and is printed on your own label.
Does compounded tirzepatide expire?2
1Yes, and usually sooner than the approved product. Zepbound carries a manufacturer’s expiration date, and an unopened multi-dose vial or KwikPen kept in the refrigerator can be used until that date. A compounded vial carries a beyond-use date instead, set by the pharmacy that made it. Once you start using it, two limits apply, and the earlier one wins. The first is the beyond-use date on your label. The second is FDA’s, and it is blunter than most sellers’ instructions:
Discard the vial within 28 days after the first use, even if medication remains in the vial. Do not continue using medication from the vial after 28 days, even if instructions from the compounder say the medication can be used for longer than 28 days.
The reason FDA gives is contamination: a vial you have drawn from with a needle is no longer sealed, and the risk rises after 28 days. So a compounded vial does expire — on whichever comes first, the date the pharmacy printed or four weeks after you first pierced it.
If your vial has been out of the fridge1
FDA’s advice on a delivery is short: do not use any injectable GLP-1 drug that arrives warm or with insufficient refrigeration, because it can affect the drug’s quality.2 A seller that ships without enough cold packs should replace the vial.
For the approved product the label is explicit: above 30 °C, do not use it. For a compounded vial, the equivalent limit is the one your pharmacy specified, and only the pharmacy can say whether a particular vial is still usable. Call them. A pharmacy would far rather replace a vial than have you use one that has been too warm. See the medical disclaimer.
Freezing1
The approved label is unambiguous: “Do not freeze ZEPBOUND. Do not use ZEPBOUND if frozen.” It also says to protect it from heat and light and to keep it in the original carton. A compounded vial has no label of its own to say otherwise, so the only published rule for the molecule is that one — and if a vial has frozen, the pharmacy that made it is the one to ask before using it.
A vial that looks unexpected for another reason — a color you did not expect — may have something added to it; see B12, B6 and glycine.
Questions
- How long can compounded tirzepatide be out of the fridge?
- Compounded tirzepatide has no label of its own, so the pharmacy's instructions govern your vial. For comparison, the approved label allows up to 21 days unrefrigerated for a single-dose pen or vial and 30 days for a multi-dose vial, never above 30 °C (86 °F), counted as a running total rather than reset each time it goes back in the fridge.
- How long is compounded tirzepatide good for?
- Until the earlier of two dates: the beyond-use date the pharmacy printed, or 28 days after you first draw from the vial. FDA says to discard a multi-dose vial 28 days after first use even if the compounder's instructions say it lasts longer.
- Does compounded tirzepatide expire?
- Yes. Instead of a manufacturer's expiration date it carries a beyond-use date set by the compounding pharmacy, which is usually much shorter. FDA also says to discard an opened vial 28 days after first use, even if medicine remains and even if the compounder's instructions allow longer. Whichever date comes first is the one that counts.
- Can you freeze compounded tirzepatide?
- The approved label says not to freeze tirzepatide and not to use it if it has been frozen. A compounded vial has no label of its own, so ask the pharmacy that made it before using a vial that has frozen.
- What if my compounded tirzepatide arrived warm?
- FDA recommends not using any injectable GLP-1 drug that arrives warm or with insufficient refrigeration, because heat can affect its quality. Contact the seller or pharmacy for a replacement.