Forgot to Put Wegovy in the Fridge Last Night? Here Is What Matters

The decision you are really facing: use it, wait, or discard?

Most people who realise they forgot to refrigerate their Wegovy are trying to answer one question: is this pen still usable? That is the right question, but it has a conditional answer. The manufacturer specifies a maximum time and temperature for room-temperature storage, and that information lives in the Patient Information Leaflet inside your box, as well as in the Wegovy SmPC on the electronic Medicines Compendium. The document gives you the exact figure (not an approximation) because semaglutide is a protein-based medicine and its stability has been tested to a specific limit, not a rough one.

So the decision tree is fairly short. Work out when the pen came out of the fridge. If it has been at room temperature for less than the stated maximum, and the room itself was not unusually warm (direct sunlight, a hot car, a kitchen during cooking), the pen is likely still within specification. If you genuinely cannot remember when it came out, or if conditions were warm, the cautious answer is to treat it as out of specification. A wasted pen is frustrating; an ineffective injection is a worse outcome.

It is also worth knowing that our Wegovy treatment overview covers the storage basics alongside everything else you need before starting, a useful reference if you are earlier in treatment and still building your routine.

The one thing most people get wrong about 'room temperature'

There is a common belief that 'room temperature' means whatever your living room happens to be, and for most British homes in autumn or winter, that is probably fine. But the specification means a controlled range, typically up to 25°C or 30°C depending on the product, not the temperature on a warm July afternoon with the windows shut. A pen left on a sunny windowsill or in a car in summer may have reached temperatures well above what the leaflet permits, even if it was only out for a few hours.

This is not a reason to panic. It is just a reason to be honest with yourself about conditions, not just duration. If the pen was in a cool, shaded part of the kitchen overnight and it is winter, that is a different situation from the same pen sitting in a closed car for three hours in August. The full guide to unrefrigerated Wegovy goes into more detail on the temperature thresholds and what the evidence says about degraded semaglutide.

One practical note: if you are regularly leaving pens out by accident, it may be worth reviewing how to store Wegovy correctly at home, simple habits like putting the next pen in the fridge door rather than the back of a shelf make the routine easier to maintain.

When to contact your prescriber, and what they will want to know

Contact your prescriber or dispensing pharmacy if: you cannot establish how long the pen was out of the fridge; the pen was exposed to temperatures you believe exceeded the stated limit; or the liquid inside looks discoloured, cloudy, or contains particles. The NHS guidance on semaglutide (Wegovy) directs patients to check the Patient Information Leaflet and to speak to a pharmacist or doctor if they have any doubt about their medicine's condition.

Your prescriber will want to know the approximate duration and likely temperature. They will not expect precision to the minute, just a reasonable account of what happened. If they advise discarding the pen, they can also advise on your next steps: whether to wait for the next scheduled dose or to order a replacement. At our pharmacy, aftercare is included as standard, and the clinical team is available seven days a week for exactly this kind of question. If you need to reach us, the contact page has all the details.

Never inject a pen you are uncertain about on the basis that it looks fine. A degraded pen may appear completely normal. The medicine inside is a protein, and proteins can lose their structure before any visual change appears. For a broader look at how the injection process works and common questions about pen preparation, the guide on what to do if you forgot to prime your Wegovy pen is worth reading alongside this one.

Protecting your treatment, and your next supply

If you do need to discard a pen and are thinking about cost and replacement timing, you are not alone in finding that frustrating. Understanding where to buy Wegovy in the UK through a properly regulated pharmacy helps because it means your replacement order can be turned around quickly rather than waiting weeks. The definitive answer on whether Wegovy always needs refrigeration is also worth bookmarking: it explains when and why the fridge rule applies and the narrow exceptions the manufacturer allows.

Treatment consistency matters for results. Missing a dose because of a storage mishap is recoverable. What to do about the timing of that missed dose is a prescriber decision, covered in the Patient Information Leaflet and best confirmed with your clinical team. If you have broader questions about your treatment or are thinking about whether Wegovy is right for you, you can speak to our prescribers through a free consultation, the same team available if something goes wrong mid-treatment.