How Wegovy should be stored: fridge rules, room temperature limits and travel

The fridge is the default, here is why that matters

Semaglutide is a protein-based molecule, and like most biologics it loses stability when exposed to temperatures outside its approved range. The licensed storage condition for Wegovy is 2–8°C, which is standard fridge temperature. The pen should sit in the main body of the fridge rather than the door, where temperatures fluctuate more with each opening. It should also stay in its original carton: the cardboard is not just packaging, it blocks the light that can degrade the medicine.

One misconception worth addressing gently: some people assume that because Wegovy is an injection pen and not a liquid vial, storage is less critical. It is not. The formulation inside is just as temperature-sensitive as other injectable biologics. The pen's auto-injection mechanism does not insulate the medicine from ambient conditions.

Freezing is a clear hard stop. A pen that has been frozen (even briefly, even if it looks unchanged) should not be used. There is no reliable way to assess visually whether a frozen pen has been compromised, so the guidance from the Wegovy SmPC on the eMC is unambiguous: discard it and contact your pharmacist.

Room temperature: what the leaflet actually tells you

There is a permitted room-temperature window for Wegovy pens, and it exists precisely because life is not a controlled fridge environment, you travel, you stay somewhere overnight, you forget to put the pen away immediately after your morning injection. The leaflet specifies the maximum number of days a pen may be kept at room temperature (at or below 30°C) before it must be used or discarded. That specific number is published in the Patient Information Leaflet that comes with your pen and is also available via the eMC product page; it is the figure that governs your pen, not a shortened or extended version of it.

What the window does not permit is cycling a pen in and out of the fridge across multiple separate periods and adding those periods together. Once out of the fridge, the clock runs. If a pen reaches the end of its room-temperature limit, it should be discarded even if doses remain inside. Our temperature storage guide goes into further detail on what happens at each end of the range.

For a closer look at when refrigeration is and is not strictly required, the fridge storage page covers the practical questions patients most often raise with our prescribers.

Travelling with Wegovy: practical considerations

Travelling with an injectable medicine is straightforward once you know the rules. For short trips within the room-temperature window, the pen can be kept in a cool bag away from direct sunlight, not in a car glove box in summer, where temperatures routinely exceed 30°C. Flying requires some planning: keep the pen in your carry-on luggage rather than the hold, where temperatures can drop below freezing at altitude. Airport security in the UK is familiar with injectable medicines; carrying your prescription or a pharmacist's letter avoids delays.

For longer trips where fridge access at your destination is uncertain, it is worth reading our guide to how Wegovy is stored before you leave, so you know your pen's remaining room-temperature days rather than assuming you have the full window. If you are travelling internationally, different countries have different rules about importing prescription medicines; check with the relevant embassy or consulate in advance.

Timing your weekly injection around travel is another practical consideration. Our injection timing guide covers how to manage dose days sensibly, including what the guidance says about a day or two's flexibility.

When something goes wrong with storage

Accidents happen. If a pen has been left in a hot car, stored in a freezer by mistake, or dropped and the cartridge looks damaged, do not inject it. Contact your pharmacist or prescriber to explain what happened; they can advise whether a replacement is appropriate and how to dispose of the affected pen safely. Sharps disposal is its own consideration: used needles should go into an approved container rather than a household bin. A one-litre sharps container is a practical addition to your injection kit for home use.

If you notice that the liquid in the pen looks cloudy, discoloured or contains visible particles, do not use it regardless of whether storage appeared correct. The Wegovy solution should be clear and colourless. Any doubt: don't inject, call the pharmacy.

If a pen is lost or damaged and you need to understand the full cost picture of your treatment, the Wegovy price page explains how private prescriptions are structured. For broader context on how Wegovy fits into the UK weight-loss treatment landscape, the Wegovy overview is the place to start.