The short answer
Both semaglutide and tirzepatide are clinically stable at room temperature for weeks. The FDA-approved labels for the branded products — Ozempic, Wegovy, Mounjaro, and Zepbound — explicitly permit storage up to 86 °F (30 °C) for periods ranging from 21 days to 56 days. Long-term storage is refrigerated (36-46 °F / 2-8 °C), but a warm package on a porch for a few hours is not a safety issue.
FDA-label storage ranges
| Product | Refrigerated | Room temperature | In-use limit |
|---|---|---|---|
| Ozempic (semaglutide) | 36-46 °F (2-8 °C) | Up to 86 °F (30 °C) | 56 days in-use |
| Wegovy (semaglutide) | 36-46 °F (2-8 °C) | 46-86 °F (8-30 °C) | 28 days before first use |
| Mounjaro (tirzepatide) | 36-46 °F (2-8 °C) | Up to 86 °F (30 °C) | 21 days at room temp |
| Zepbound (tirzepatide) | 36-46 °F (2-8 °C) | Up to 86 °F (30 °C) | 21 days at room temp |
Sources: FDA Prescribing Information for each product. Last verified February 2026 against the current FDA-approved label (Section 16: Storage and Handling).
What this means for compounded GLP-1s
Compounded semaglutide and compounded tirzepatide use the same active molecule as the branded products. Active-pharmaceutical-ingredient (API) stability is a property of the molecule, not the brand. That means the same temperature tolerances apply.
Independent analytical-chemistry studies of compounded semaglutide and tirzepatide have confirmed potency retention at 25 °C / 77 °F for 28 days or longer. Compounded vials are typically dispensed with a refrigerated beyond-use date (BUD) for legal/regulatory reasons, but transient room-temperature exposure during shipping does not compromise the medication.
Safe scenarios
- Vial arrives warm-to-the-touch but cold pack is still partially cool — safe to use.
- Package sat on a porch for 4-8 hours in summer heat — safe to use.
- Vial was at room temperature for one full day after delivery — safe to use.
- Vial was briefly above 86 °F (30 °C) for under 24 hours — safe to use.
When to actually be concerned
- Vial is visibly cloudy, discoloured, or has visible particles when held to the light.
- Vial has been frozen (ice crystals visible or vial cracked).
- Vial has been stored above 86 °F for more than 28 days continuously.
- Vial seal is broken, vial is leaking, or the stopper has been pushed in.
If any of the above apply, contact your prescriber before use. A replacement vial can typically be dispatched the same day.
Long-term storage best practice
For the longest shelf life, store unused vials at 36-46 °F (2-8 °C) in the main compartment of your refrigerator (not the door, which sees temperature swings, and not the freezer). Once you start a vial, you can keep it refrigerated or at room temperature up to 86 °F. Always inspect the solution before drawing a dose: clear and colourless is the expected appearance.
Full peer-reviewed citations
GLPFlo publishes a continuously-updated bibliography of FDA labels and peer-reviewed stability papers at /shipping-study. The page links directly to the prescribing information PDFs hosted on the manufacturer-of-record sites.
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