How to store Ozempic, Wegovy, Zepbound & Mounjaro: fridge, room temp, travel (2026)

The one rule that covers all of them

Store your GLP-1 in the refrigerator between 36°F and 46°F (2°C to 8°C), in its original carton to protect it from light, and never let it freeze. That single sentence is true for Ozempic, Wegovy, Zepbound, and Mounjaro [1][2][3][4]. Everything else on this page is about the exceptions — how long each one can safely leave the fridge — because that is where the drugs actually differ and where the popular 'how long out of the fridge?' question gets its real answer.

Room-temperature limits, drug by drug

The unrefrigerated window is not the same across these medications, and guessing wrong either wastes a pen or risks an unreliable dose. Here is exactly what each FDA label allows.

Zepbound (tirzepatide): each single-dose pen can be stored unrefrigerated at temperatures not to exceed 86°F (30°C) for up to 21 days. Once stored at room temperature, it should not be returned to the refrigerator, and it must be discarded if not used within 21 days of leaving the fridge [1].

Mounjaro (tirzepatide): the same rule as Zepbound — up to 21 days at room temperature not exceeding 86°F, kept in the original carton [2].

Wegovy (semaglutide): before the pen cap is removed, the pen can be kept from 46°F to 86°F (8°C to 30°C) for up to 28 days, in its original carton. Do not freeze, and protect it from light [3].

Ozempic (semaglutide): the rule is different because it is a multi-dose pen. Before first use, keep it refrigerated. After first use, the pen can be stored for 56 days at controlled room temperature (59°F to 86°F) or in the refrigerator — whichever is convenient — with the cap on. Do not freeze [4].

Why freezing ruins it — and how to avoid accidental freezing

These drugs are peptides — delicate protein-based molecules. Freezing can denature the protein and make the dose unreliable even if the liquid looks normal after it thaws, which is why every label says not to freeze and to discard a pen that has frozen [1][2][3][4].

The most common accidental freeze happens inside your own refrigerator. Store pens in the middle of the main compartment, not in the door (where temperature swings most) and not pressed against the back wall or the cooling vents (the coldest spots, which can dip below freezing). A cheap fridge thermometer is worth it if you are unsure your fridge holds the 36-46°F range.

Traveling with your GLP-1

The generous room-temperature windows (21 days for tirzepatide, 28 for Wegovy, 56 for Ozempic after first use) mean most trips need no refrigeration at all — just keep the pen in its original carton, out of direct heat, and below 86°F. For long trips, hot climates, or to preserve the fridge clock, pack it in an insulated bag with a gel pack, but keep a cloth barrier so the pen never touches a frozen pack directly.

Flying: put the medication in your carry-on, never checked luggage, because cargo holds can drop below freezing. Keep it in the labeled original carton, and bring your prescription information. Injectable medications and the cool packs to keep them are permitted through airport security as medically necessary items — declare them if asked.

How to tell a pen has gone bad

The medication inside should be clear and colorless. Do not inject a pen if the solution is cloudy, discolored, or contains particles; if it has frozen at any point; if it has been exposed to heat above 86°F; if it is past its printed expiration date; or if it has exceeded the room-temperature window for that specific drug [1][2][3][4].

When any of those apply, the safe move is to set the pen aside and call your pharmacist before your next dose. Injecting a compromised pen risks an under-strength dose that stalls your progress — an expensive gamble when a replacement conversation costs nothing.