Does Zepbound need refrigeration and how long can it stay out of the fridge? Eli Lilly storage rules for pens and vials, plus red flags.
Key points
- 01Unopened Zepbound is stored refrigerated (2 to 8 °C). Eli Lilly's Instructions for Use describes storing unopened Zepbound pens and vials refrigerated at 2 to 8 °C (36 to 46 °F) until first use. Keep the product in the original carton to protect it from light.
- 02The time-out-of-fridge window for Zepbound is up to 21 days. The prescribing information describes storage at room temperature up to 30 °C (86 °F) for up to 21 days. That is a shorter window than the 56 days on Ozempic or the 28 days on Wegovy. After that, a pen or vial must be discarded even if it still holds medication. Always verify the current package insert.
- 03Never freeze it. The prescribing information describes discarding frozen Zepbound. Freezing alters the protein structure of tirzepatide. Do not store the product against the cold back wall or cooling element of the refrigerator, where it can freeze.
- 04Zepbound comes as a single-dose pen and a vial. The single-dose pen and the single-dose vial each deliver one dose. The 21-day window applies to a product taken out of the fridge and kept at room temperature before you use it. For the administration steps themselves, see the guide on how to inject Zepbound.
- 05Mark the date it first left the fridge. Because the room-temperature window starts at first removal, it helps to write that date on the carton. This lets you identify the 21-day discard day reliably.
- 06Keep Zepbound below 30 °C and away from heat and light. The documented upper limit for room-temperature storage is 30 °C (86 °F). A car in summer sun, a windowsill, or an overheated hotel room can exceed it. Keep the product in its original carton to shield it from light.
- 07Let a refrigerated dose warm before injecting. A refrigerated dose is described as more uncomfortable to inject in the patient-education literature. A room-temperature dose is associated with less stinging. About 30 minutes out of the fridge is enough, and the product is not re-warmed by any other method.
- 08For travel, a simple cooling pouch is often enough. For trips inside the 21-day window, a cooling pouch is optional. For long ground time in hot climates, an evaporative pouch holds contents at roughly 18 to 26 °C. The flying with GLP-1 medications guide covers airport security and cooling cases.
Frequently asked questions
Does Zepbound need to be refrigerated?+
Unopened Zepbound is stored refrigerated at 2 to 8 °C (36 to 46 °F) per the prescribing information. Before use it may be kept at room temperature up to 30 °C for up to 21 days. Verify against the current package insert.
How long can Zepbound be left out of the fridge?+
The Zepbound prescribing information describes a window of up to 21 days at room temperature below 30 °C (86 °F). After 21 days a pen or vial must be discarded even if it still holds medication.
Is the out-of-fridge window the same for Zepbound and Mounjaro?+
Both contain tirzepatide and describe up to 21 days out of refrigeration at room temperature below 30 °C. Ozempic (56 days) and Wegovy (28 days) both run longer. Always check your own package insert.
What happens if Zepbound was frozen?+
The prescribing information describes discarding frozen Zepbound; it must not be used. Freezing alters the protein structure of tirzepatide. Do not store it against the cold back wall of the refrigerator.
Can I put Zepbound back in the fridge after it has been at room temperature?+
Yes, as long as the total time out of refrigeration stays within 21 days and the temperature stayed below 30 °C. The window counts cumulative time at room temperature, not each individual move.
