Storage & refrigeration

Ozempic storage: fridge rules, and what to do if it's left out

The exact storage windows and temperature limits for Ozempic, Wegovy, Mounjaro, and Zepbound — straight from the FDA labels — plus a clear answer to the panic question: “I left my pen out, is it still okay?”

Written byGLP1Zoom Editorial, Medical content team · Independent editorial

Medically reviewed byGLP1Zoom Editorial Team, Evidence-based editorial review Reviewed Jun 10, 2026

Verified Jul 2026 · re-checked quarterlyBy the GLP1Zoom editorial teamWe compare, we don’t sell

The short answer

Before first use: keep all of them in the fridge (36–46°F). After first use: Ozempic lasts 56 days in the fridge or at room temp (59–86°F); Mounjaro and Zepbound last 21 days (up to 86°F). Never freeze any of them. Left an in-use pen out overnight below 86°F? It's almost certainly fine — exposed to heat above 86°F, don't risk it.

Key takeaways

Before first use (all four): refrigerate at 36-46°F (2-8°C). Never freeze; do not use if frozen.
In-use windows: Ozempic 56 days (fridge OR room temp 59-86°F); Mounjaro & Zepbound 21 days (up to 86°F). The discard clock starts at first use and does not reset.
Wegovy varies by pen: single-dose = inject at cap removal (up to 28 days at 46-86°F before use); the newer FlexTouch multi-dose pen = 56 days after first use.
An in-use Ozempic pen left out overnight below 86°F is within range. Above 86°F, or an unopened pen left out, call the manufacturer before using.
Zepbound may be returned to the fridge after room-temperature storage (per its label).

Does Ozempic have to stay in the fridge?

It is stored refrigerated, but the label allows a defined stretch at room temperature, and the allowance differs by presentation. Here is what the Ozempic label permits, in its own words.

Pen in use

56 days from first use — at room temperature or refrigerated, then discard

“Store your pen in use for 56 days at room temperature between 59°F to 86°F (15°C to 30°C) or in a refrigerator between 36°F to 46°F (2°C to 8°C).”

The label adds that the pen is thrown away after 56 days even if it still has Ozempic left in it. Unlike the tirzepatide pens, the clock is not "time out of the fridge" — it runs from first use either way.

Prefilled syringe

Up to 28 days out of the refrigerator, within 8–30°C (46–86°F)

“If needed, the prefilled syringes can be stored out of the refrigerator between 46°F to 86°F (8°C to 30°C) for up to 28 days.”

Note the floor as well as the ceiling — a range, not simply "below 30°C". This row is the syringe presentation, not the pen.

Quoted from the Ozempic prescribing information (label version 2026-07-30). Read it on dailymed.nlm.nih.gov.

If you switched from another GLP-1, the number changed

Allowances are set drug by drug, not by the class — and they do not all measure the same thing. The tirzepatide pens count time spent OUT of the fridge; Ozempic and Saxenda count days from first use whether refrigerated or not.

Zepbound: up to 21 days total at room temperature, then discard
Mounjaro: up to 21 days total at room temperature, then discard
Wegovy: discard once out of the refrigerator for 28 days
Trulicity: up to 14 days total at room temperature — the shortest allowance in the class
Saxenda: 30 days after first use, at room temperature or refrigerated

These are the label’s own limits, not medical advice. A pen that has been out longer than its allowance is a question for the pharmacy that dispensed it.

Storage at a glance

Drug	Before first use	After first use (in use)
Ozempic	Fridge 36–46°F	56 days — fridge or 59–86°F
Wegovy (single-dose)	Fridge 36–46°F (up to 28 days at 46–86°F)	Inject at cap removal (single use)
Wegovy (FlexTouch)	Fridge 36–46°F	56 days — fridge or 59–86°F
Mounjaro	Fridge 36–46°F	21 days — up to 86°F
Zepbound	Fridge 36–46°F	21 days — up to 86°F

From the FDA labels/Instructions for Use. None may be frozen. Always follow the IFU that came with your specific pen — presentations differ.

“I left it out” — a quick decision guide

In-use pen, room stayed ≤86°F

Almost certainly fine. Ozempic tolerates up to 86°F across its 56-day window; Mounjaro/Zepbound up to 86°F across 21 days. Just keep counting from first use.

Exposed to heat above 86°F (hot car, sunny sill)

Do not assume it's safe — heat can degrade it. Contact the manufacturer before using (US Ozempic: Novo Nordisk 1-800-727-6500).

It froze (or may have)

Do not use it. Freezing damages these medications, even if the pen looks normal after thawing.

Unopened pen left out

The Ozempic label gives no room-temperature shelf life for unopened pens — keep them refrigerated. If one was left out, ask the manufacturer before using.

Traveling with your pen

For flights and trips, a GLP-1 can ride in a cool bag and doesn't need to stay strictly cold for the day if kept below 86°F, but plan around the in-use window and heat. For the detailed travel and TSA rules, see our GLP-1 travel & refrigeration guide.

The one rule with no judgment call: freezing

Most storage questions come down to how long and how warm. Freezing is different — a GLP-1 that has frozen should not be used, even if it has thawed and looks normal. Freezing can damage the protein in ways you cannot see, so “it looks fine” is not evidence that it is.

The realistic ways this happens are worth knowing, because they are all accidental: a pen pushed to the back of a fridge against the cooling plate, a refrigerator set colder than intended, a cool bag packed directly against ice or a frozen gel pack, or a car left overnight in freezing weather. Keep pens in the middle of the fridge rather than the back, and put a barrier between the pen and any ice pack when travelling.

You should also inspect before injecting. If the liquid is cloudy, discolored, or has visible particles when it should be clear, do not use it — call your pharmacist. Do not try to “rescue” a pen you are unsure about; a replacement conversation is cheaper than an unpredictable dose.

Two situations people ask about

Situation	What to do
A power outage while pens were in the fridge	Keep the door shut — a closed fridge holds temperature for hours. Afterwards, judge by how long and how warm, and call your pharmacist if you are unsure
It froze, but thawed and looks fine	Do not use it. Freezing damage is not visible
Left out, but within the in-use window and below the temperature limit	Generally still usable — check your own Instructions for Use
Cloudy, discolored, or has particles	Do not use it — call your pharmacist
You cannot reconstruct how long it was out	Treat uncertainty as a reason to ask, not to guess

Pharmacists field this question constantly and can check your specific product and situation. If a pen has to be replaced, that is also worth raising with your prescriber — depending on the circumstances, an early refill may be possible.

This page summarizes the FDA labels as of 2026-07-18 and is educational, not medical advice. Presentations and instructions can change — the Instructions for Use in your box is the final word, and your pharmacist can confirm.

Compare GLP-1 providers

Common questions about Ozempic storage

Does Ozempic need to be refrigerated?

Before you first use it, yes — keep the Ozempic pen in the refrigerator at 36°F to 46°F (2°C to 8°C). After first use, an Ozempic pen can be kept for up to 56 days either in the refrigerator or at room temperature between 59°F and 86°F (15°C to 30°C). So once it is in use, it does not have to stay cold — but it must be discarded 56 days after first use. Never freeze it, and do not use it if it has been frozen.

How long can Ozempic (and other GLP-1s) be out of the fridge?

It depends on the drug and whether it is in use. An in-use Ozempic pen is fine at room temperature (up to 86°F) for its 56-day window. Mounjaro and Zepbound can be kept at room temperature (up to 86°F) for 21 days. Wegovy differs by pen type: the single-dose pen/syringe can sit at 46°F–86°F for up to 28 days before you use it, while the newer Wegovy FlexTouch multi-dose pen follows the 56-day rule after first use. For an unopened Ozempic pen left out, the label gives no room-temperature shelf life — keep unopened pens refrigerated, and if one was left out, contact the manufacturer before using it.

What do I do if I left my Ozempic out overnight?

If it was an in-use pen and the room stayed at or below 86°F (30°C), it is within the allowed range — an Ozempic pen tolerates room temperature up to 86°F throughout its 56-day in-use window, so overnight on the counter is generally fine. If the pen was exposed to heat above 86°F, or if it is an unopened pen (which the label says to keep refrigerated), do not assume it is safe — call the manufacturer (Novo Nordisk, 1-800-727-6500 for US Ozempic) before using it. When in doubt, ask rather than inject a potentially degraded dose.

Can you freeze Ozempic or the other GLP-1 pens?

No. None of these medications — Ozempic, Wegovy, Mounjaro, or Zepbound — should be frozen, and you must not use a pen that has been frozen, even if it looks normal afterward. Freezing can damage the medication. Keep pens away from the freezer compartment and don't let them rest directly against the cooling element at the back of the fridge, which can be cold enough to freeze them.

Can I put my pen back in the fridge after it's been at room temperature?

For Zepbound, yes — the label explicitly says a pen stored at room temperature may be returned to the refrigerator. For Ozempic, the pen can move between fridge and room temperature within its 56-day window as long as it stays within the allowed temperatures. Whichever way you store an in-use pen, the discard clock (56 days for Ozempic, 21 for Mounjaro/Zepbound) keeps running from first use — moving it back to the fridge does not reset it. Always follow your specific pen's Instructions for Use.

My pen froze but thawed and looks normal — can I use it?

No. A GLP-1 that has frozen should not be used even if it has thawed and looks completely normal, because freezing can damage the protein in ways you cannot see. "It looks fine" is not evidence that it is. The common accidental causes are a pen pushed to the back of the fridge against the cooling plate, a refrigerator running colder than intended, a cool bag packed directly against ice or a frozen gel pack, or a car left overnight in freezing weather. Keep pens in the middle of the fridge and put a barrier between the pen and any ice pack when travelling.

What if the power went out while my pens were in the fridge?

Keep the door shut — a closed refrigerator holds its temperature for hours, and opening it to check is the thing most likely to cost you the pens. Afterwards, judge by how long the outage lasted and how warm it got, and call your pharmacist if you are unsure rather than guessing. Pharmacists field this question constantly and can check your specific product and situation. If a pen does have to be replaced, mention it to your prescriber too, since an early refill may be possible depending on the circumstances.

The liquid looks cloudy or has particles. Is that normal?

No — if the liquid is cloudy, discolored, or has visible particles when it should be clear, do not use it, and call your pharmacist. Inspecting before each injection takes a couple of seconds and is worth making a habit. The general principle with any storage doubt is the same: do not try to rescue a pen you are unsure about. A replacement conversation is straightforward, and an unpredictable dose is not.

Sources

Storage windows and temperatures are from the FDA-approved Instructions for Use for Ozempic, Wegovy, Mounjaro, and Zepbound. Reviewed 2026-07-18. Educational only — always follow the IFU in your box and ask your pharmacist if unsure.

References(3)

Our sourcing standards →

Ozempic (semaglutide) Prescribing Information & Instructions for Use — storage (in-use 56 days, 59-86°F)NIH — US FDA label via DailyMed (2026)
Wegovy (semaglutide) Instructions for Use — single-dose (28 days before use, 46-86°F) & FlexTouch (56 days) storage — US FDA label (novo-pi.com), rev. 06/2026 (2026)
Mounjaro & Zepbound (tirzepatide) Prescribing Information — storage (in-use 21 days, ≤86°F)NIH — US FDA labels via DailyMed (2026)