Should Wegovy Be Refrigerated, and What Happens If It Isn't?

Does Wegovy actually need to be refrigerated at all times?

Yes, until you take it out to inject. Before first use, every Wegovy pen should sit in the fridge at between 2°C and 8°C, away from the freezer compartment and away from the back wall where temperatures can drop below zero. Freezing destroys the medicine; a pen that has been accidentally frozen must be discarded, even if it thaws and looks unchanged.

Once you remove the pen from the fridge for an injection, you do not need to put it back. Wegovy is a multi-dose pen, meaning the same pen is used for four consecutive weekly injections, so it lives partly in the fridge and partly out of it over its use period. The NHS semaglutide page confirms that unrefrigerated storage is permitted for a defined period, but always check the current Patient Information Leaflet inside your pack for the precise number of days, the SmPC is the authoritative source and takes precedence over any figure you read online.

A practical note: keep the pen in the fridge door rather than a high shelf, it is easier to remember, less likely to roll against a cold spot, and quicker to find on injection day.

What is the room-temperature time limit, and what happens if you go over it?

The licensed room-temperature window for Wegovy (the maximum time a pen can remain below 30°C outside the fridge) is clearly stated in the leaflet that comes with your prescription. We do not quote the exact number of days here, because the figure can differ between pen formats and may be updated when the SmPC is revised; your leaflet is always current.

What is clear is that once the allowance runs out, the pen must be thrown away. Using an out-of-window pen risks receiving a degraded dose of semaglutide, which means less active medicine than the label states. That matters both for safety and for whether your treatment is working as expected. If you are unsure whether the clock has run out on a pen (because you lost track while travelling, or the pen sat on the worktop over a bank holiday) the cautious answer is not to use it. Speak to the prescriber or aftercare team who manages your treatment before injecting.

For detailed questions about storage across a specific trip, our page on how long Wegovy can stay out of the fridge sets out the practical considerations in full.

What should you do when refrigeration isn't available, travel, power cuts, holidays?

Cold-chain planning is one of those things that feels unnecessary until it isn't. A long weekend away, a flight, a power cut at home: any of these can interrupt refrigeration if you have not thought it through in advance.

A good-quality insulated medication cool bag with a gel ice pack can keep pens within the safe temperature range for several hours on a journey. The packs should not touch the ice pack directly, wrap the pen in a soft cloth if needed, as direct contact with ice can freeze the medicine. On a flight, always carry the pen in your hand luggage; aircraft hold temperatures can drop well below freezing.

If a power cut lasts long enough that you cannot be certain the fridge stayed below 8°C throughout, treat the pen as potentially compromised and contact your prescriber. The same applies to a pen left in a hot car: a closed vehicle in summer sun can reach 60°C inside, well beyond the safe limit, and even a short exposure may degrade the medicine. Our guide to whether Wegovy needs refrigeration covers edge cases and when to seek clinical guidance.

If you take Wegovy as part of a clinical programme and are approaching a holiday period (or even just ordering around a bank holiday) it is worth timing your supply so that a new pen is safely in your fridge before you travel, rather than relying on one that has been out for days. Where you source your supply affects how reliably that timing works: a GPhC-registered pharmacy with same-working-day dispatch and tracked delivery gives you a much tighter window to plan around.

Are there any signs that a Wegovy pen has been damaged by incorrect storage?

Not always visible ones. That is the difficulty. A frozen-and-thawed pen, or one that has been exposed to excessive heat, often looks identical to a correctly stored pen. If you have ever wondered whether Wegovy has to be refrigerated and what the consequences are of skipping that step, the answer is that the liquid may appear clear and colourless, the pen may click and prime normally, and yet the semaglutide may be partially or fully denatured.

Some degradation can show: if the solution looks cloudy, discoloured, or contains particles, do not use it regardless of storage history. But the absence of visible changes is not a guarantee. This is why the time-and-temperature rules exist, they are a proxy for potency when you cannot see the molecule.

If you have any doubt at all about a pen's storage history, contact whoever prescribed it. A replacement pen is a much smaller problem than an injection of degraded medicine, both for your safety and for the consistency of your treatment. Patients often ask whether Wegovy is refrigerated and what that means in practice for day-to-day handling, and you can find a full explanation on that page alongside the broader picture of what Wegovy is and how it works on the Wegovy treatment overview. For any supply question or aftercare concern with a nume prescription, our team is reachable via the contact page seven days a week.

Thinking about starting treatment? Check your eligibility with a free consultation, a GPhC-registered prescriber reviews your information the same day, and if you are clinically suitable, your pen is dispatched with free next-working-day tracked delivery.