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

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.

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.

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.

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.

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.

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.

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.

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.