Yes — store Ozempic and every other GLP-1 (Wegovy, Mounjaro, Zepbound, and compounded semaglutide or tirzepatide) in the refrigerator at 36–46°F (2–8°C) before first use. After the first use, most can sit at room temperature for a limited window — Ozempic up to 56 days, Wegovy up to 28 days, Mounjaro and Zepbound single-dose pens up to 21 days (KwikPens up to 30). Never freeze a GLP-1, and never use one that's been frozen. Here's the full storage-and-travel guide, with the exact limits for each drug.
Important: always follow the storage instructions on your specific medication's label and Instructions for Use — this is general guidance, and beyond-use dates for compounded products come from your pharmacy.
Does Ozempic need to be refrigerated?
Yes. Keep Ozempic refrigerated at 36–46°F (2–8°C) until you use the pen for the first time. After first use, you can keep it in the fridge or at room temperature (59–86°F) for up to 56 days, then discard it. Don't store it in the freezer, and don't use a pen that has frozen — freezing damages the medication even if it looks normal after thawing.
The same principle applies to every GLP-1 pen: cold storage before first use, then a limited room-temperature window after.
How long can each GLP-1 stay out of the fridge?
Each GLP-1 has its own room-temperature limit after first use — here's the full breakdown. Keep them below 86°F (30°C) and out of direct heat and light.
| Medication | Before first use | Room temp after first use |
|---|---|---|
| Ozempic (semaglutide) | Refrigerate 36–46°F | Up to 56 days |
| Wegovy (semaglutide) | Refrigerate 36–46°F | Up to 28 days |
| Mounjaro (tirzepatide) | Refrigerate 36–46°F | Single-dose 21 days; KwikPen 30 days |
| Zepbound (tirzepatide) | Refrigerate 36–46°F | Single-dose 21 days; KwikPen 30 days |
| Compounded sema/tirzepatide | Refrigerate | Follow your pharmacy's beyond-use date |
Once a pen passes its room-temperature limit, discard it even if medication remains — potency is no longer guaranteed.
Can you freeze a GLP-1 medication?
No — never freeze Ozempic, Wegovy, Mounjaro, Zepbound, or compounded GLP-1s. If a pen or vial freezes, throw it away, even if it looks fine after thawing. Freezing degrades the peptide and you can't tell by looking. This is the most common way GLP-1s get ruined — usually by sitting against the back wall or freezer compartment of a fridge, or riding in a checked bag through a cold cargo hold.
What happens if you leave your GLP-1 out of the fridge too long?
If it's still within the room-temperature window for your drug (for example, 56 days for Ozempic) and stayed below 86°F, it's fine to use. If it exceeded the window, got hot, or you're unsure, don't use it — call your pharmacy. A pen left on the counter overnight is almost always fine; a pen left in a hot car or past its limit is not. When in doubt, your pharmacist can tell you whether a specific exposure ruined it.
How do you travel or fly with a GLP-1?
Pack your GLP-1 in your carry-on (never checked luggage), in an insulated case with a cool pack that won't freeze it, and bring your prescription label. The cargo hold can freeze or overheat your medication, so it always flies with you in the cabin.
- Carry-on only — checked bags risk freezing in the hold or extreme heat.
- Use an insulated travel case with a gel/cool pack, but don't let the pen touch a frozen pack directly — freezing ruins it. Medication travel cases designed to hold 36–46°F for a day or more work well.
- TSA: medications and cool packs are allowed through security; keep them in original packaging with the pharmacy label for smooth screening.
- Never leave it in a hot car — interior temperatures blow past 86°F fast.
- On arrival, refrigerate it again if you're still in the before-first-use phase; if it's already in its room-temperature window, room temp is fine.
How should you store compounded semaglutide or tirzepatide?
Refrigerate compounded GLP-1s and follow the beyond-use date your compounding pharmacy provides — it's specific to your vial and usually shorter than a brand pen's window. Telehealth providers ship compounded medication cold, often with an ice pack; refrigerate it as soon as it arrives. If a shipment arrives warm — the ice pack fully thawed and the vial warm — contact the provider before using it. Reputable programs replace a compromised shipment, another reason to use a verified provider with real support.
Do you need to let a GLP-1 warm up before injecting?
Yes — injecting cold medication straight from the fridge stings more, so let the pen sit at room temperature for about 15–30 minutes first. It's optional but makes the injection more comfortable. For the full technique, see our how to inject GLP-1 guide.
Frequently asked questions
Does Ozempic need to be refrigerated after opening? Not necessarily — after first use you can keep Ozempic at room temperature (up to 86°F) or refrigerated for up to 56 days, then discard.
How long can Ozempic be left out of the fridge? Up to 56 days at room temperature after first use, as long as it stays below 86°F. Wegovy is 28 days; Mounjaro and Zepbound single-dose pens are 21 days.
Is Ozempic ruined if it freezes? Yes — discard any GLP-1 that has frozen, even if it looks normal after thawing. Freezing degrades the medication.
Can you travel with Ozempic on a plane? Yes — pack it in your carry-on in an insulated case with a cool pack (not frozen against the pen), and bring your prescription label. Never put it in checked luggage.
Does compounded semaglutide need refrigeration? Yes — refrigerate it and follow the beyond-use date from your compounding pharmacy, which is specific to your vial.
Bottom line
Refrigerate every GLP-1 before first use, keep it out of the freezer entirely, and after opening you have a room-temperature window ranging from 21 days (Mounjaro/Zepbound single-dose) to 56 days (Ozempic). Traveling is easy: carry-on, insulated case, a cool pack that won't freeze it, and your prescription label.
If your medication ships from a telehealth provider, choose one with reliable cold-chain shipping and real support in case a package arrives warm — compare verified programs on our best GLP-1 providers list.