How long can Wegovy stay in the refrigerator — and what happens if conditions change?

The refrigerator is the default, but the expiry date is the true limit

A sealed, unopened Wegovy pen kept continuously at 2–8°C is stable right up to the date printed on the carton. Most people store the pen in the main body of the fridge, away from the ice compartment and the back wall where temperatures can dip below freezing. Freezing destroys the medicine. Even a brief freeze renders the pen unusable, and the liquid will not show any visible change to alert you.

Fridge thermometers vary, and domestic fridges often have cold spots. It is worth checking the actual temperature with an inexpensive thermometer rather than trusting the dial setting. If you are on a longer titration journey and a new pen arrives before the previous one is finished, the incoming pen sits in the fridge in its original packaging until you need it. The plain, unbranded box it arrives in from DPD gives nothing away on the doorstep, and the pen itself is straightforward to identify once you open it.

The NHS medicines page for semaglutide describes the standard storage requirements; for the exact stability data, always cross-check the Patient Information Leaflet that comes inside the carton.

What the room-temperature window actually means for your pen

Wegovy can be kept at room temperature (below 30°C) for a defined period, and if you want to understand exactly how long Wegovy can be out of the refrigerator, that page sets out the details along with what affects the count. This page will not print a specific number of days, because that figure can differ between pen formats and is the kind of detail that should come from the leaflet in your hand rather than from an article you read online. The key point is that the window is finite and not renewable.

Once a pen has been removed from the fridge and reaches room temperature, the cumulative time out counts towards that limit regardless of whether you put it back in the fridge between uses. The refrigerator does not pause the clock. If you travel, keep the pen in a cool bag away from direct sunlight, and know how many hours it has already spent outside refrigeration before you left home. Questions about storage during longer trips are worth raising with the prescribing team. You can find broader detail on what to do when Wegovy has been out of the fridge, including what to check before each use.

This matters practically: if a pen has exceeded its room-temperature window and you inject it anyway, you may be injecting medicine that has partially degraded. You would not know from appearance alone. The decision to discard the pen protects the integrity of your treatment, even though it feels wasteful.

Signs that a pen should not be used, whatever the fridge history

Visible changes are an automatic stop. The liquid inside a Wegovy pen should be clear and colourless to slightly yellow with no particles. Cloudiness, discolouration, floating particles or a pen that has visibly frozen at any point are all reasons to discard. Do not shake the pen; if it looks wrong, it is wrong.

Physical damage matters too. A bent needle, a cracked cartridge window or a pen that has been dropped onto a hard surface may not function correctly or safely. The pen mechanism that drives the dose relies on the cartridge being intact. If you have any doubt about a pen's condition, contact your prescribing team before using it rather than after.

There is one more practical consideration: the expiry date is a hard boundary. A pen at 2°C that expired last month is not usable. The date printed on the label accounts for the manufacturer's tested stability data; it is not a conservative estimate with built-in slack. If you are managing overlapping supply and worried about expiry timing, our page on how long Wegovy can be stored in the refrigerator covers what the guidance says and how to plan around it. You can also read a related question our clinical team hears regularly on how long semaglutide can be kept in the fridge more generally.

When to check with a clinician rather than rely on general guidance

Most storage questions have a clear answer in the leaflet. A handful do not. If your fridge failed overnight and you are not sure how warm it got, or if a pen was left in a hot car for an unknown period, general rules will not give you a reliable answer. In those situations, using the pen is a gamble; the medicine may be fine or it may not, and there is no simple test at home to check.

The right move is to contact your prescribing service. At nume, aftercare is available seven days a week, so these are exactly the questions the team is there for. Storage uncertainty is also a reason some patients prefer to keep a spare pen appropriately refrigerated where supply allows, though that is a clinical discussion, not a routine recommendation.

If you are considering Wegovy and want to understand the broader picture on cost and supply, the context on Wegovy pricing in the UK is worth reading before making any decisions. For everything from how the medicine works to what the treatment journey looks like, our Wegovy overview covers the full picture. And if you have general questions before starting, our FAQs may already have the answer.

These are prescription-only medicines, and every repeat supply at nume goes through a fresh clinical review. When you are ready to explore whether treatment is right for you, speak to our prescribers through a free consultation.