Does Wegovy need to go in the fridge — and what happens if it doesn't?

Picture the moment your delivery arrives

Your Wegovy pens come packed to stay cold. The first thing to do when they land on your doorstep is transfer them straight to the fridge. The middle shelf works well, it holds a steadier temperature than the fridge door, which warms slightly every time you open it. That one habit protects the medicine from the moment it arrives until the day you need it.

Unopened pens should sit at 2°C to 8°C. That is the same narrow band used for many vaccines and biologics, and for good reason: semaglutide is a peptide molecule that degrades outside that range. Freeze it and the medicine is gone. Leave it too warm for too long and the same applies. If you want a plain-English answer to whether you have to store Wegovy in the fridge, we cover that in detail alongside the manufacturer's guidance. The Wegovy SmPC on the eMC is the place to look for the exact window described in the manufacturer's documentation, it is the authoritative product reference.

One practical note: never store the pen in the icebox compartment or against the back wall of a fridge that tends to freeze items. If it has accidentally frozen, do not use it. The rules here are firm.

What happens once you take the pen out of the fridge

You do not have to inject straight from the cold. In fact, letting the pen reach room temperature for a few minutes before use can make the injection more comfortable. Once a pen has been taken out of the fridge, you have up to 28 days to use it, provided it is kept below 30°C and protected from light.

That 28-day window matters if you travel, work irregular hours, or simply prefer to keep the current pen somewhere more accessible than the fridge. If you are wondering how long you can store Wegovy in the fridge before opening it, that question has its own answer separate from the 28-day out-of-fridge rule. Some people keep the active pen in a cool, dark drawer. That is fine, as long as temperatures stay below 30°C. In warmer months, or if you travel somewhere hot, a small cool bag without an ice pack touching the pen is a sensible precaution, direct contact with ice can freeze the medicine.

After 28 days at room temperature, discard the pen regardless of how many doses remain. The 28-day limit applies even if the pen looks and feels perfectly normal. For questions about what this means for your specific titration schedule, the detail sits in your patient information leaflet and your prescriber can clarify it. You can read more about how semaglutide is used in the broader overview of Wegovy as a weight-management medicine.

Travel, storage failures, and when to get a replacement

A weekend away is straightforward. Most hotel mini-fridges hold an adequate temperature, and many people carry the current pen unrefrigerated for a few days without any issue, the 28-day room-temperature allowance covers short trips comfortably. Longer trips, particularly to hot climates, need a little more thought. A travel cooling case designed for injectable medicines keeps temperatures stable without freezing.

If you are not sure whether a pen has been compromised (left in a hot car, for instance, or stored above 30°C) the guidance is clear: do not use it. Wegovy is a protein-based injectable medicine and there is no visible sign that degradation has occurred. For a straightforward answer to whether Wegovy is stored in the fridge throughout its shelf life, including what applies before and after opening, that page sets it out clearly. Running out of usable medicine mid-titration is something our team at nume can help you think through. Questions about your specific situation are handled by our support team, available seven days a week.

If you are comparing storage requirements across injectable weight-loss treatments, it is worth knowing that semaglutide (Wegovy) and tirzepatide (Mounjaro) share broadly similar cold-chain requirements, though the exact windows differ by product, always check the leaflet that comes with your specific medicine. People also ask whether you need to store Wegovy in the fridge if circumstances make that difficult, and the short answer is that cold storage is essential for unopened pens. The MHRA also monitors medicines with these requirements closely; you can report concerns about storage or supply via the Yellow Card scheme.

What this means if you are considering starting Wegovy

Storage is a practical detail that is easy to plan for. A small section of your fridge, a clear 28-day rule once the pen is open, and a plan for travel, that covers most situations. The bigger questions are clinical ones: whether Wegovy is the right medicine for you, what dose you will start on, and how your progress will be reviewed.

Those decisions belong with a prescriber. If you are exploring your options, our weight-loss treatments overview sets out what is licensed in the UK and how private treatment works. Cost context is something people often ask about early on; the guide to where to buy Wegovy covers what to look for in a legitimate provider. When you are ready, you can check your eligibility with a free consultation, reviewed the same day by a GPhC-registered prescriber, not a chatbot.