How Long Can Wegovy Last Out of the Fridge — and What Happens If It Does?

Step 1, know the 28-day rule before you take the pen out

The primary storage for Wegovy is the refrigerator, kept between 2°C and 8°C, away from the freezer compartment and the back wall where temperatures can dip dangerously low. The fridge is where unused pens should stay until you need them. You can read more about fridge storage on our Wegovy fridge-storage guide, but the short version is: cold and consistent is better than warm and convenient.

When a pen comes out of the fridge, the clock starts, and you can find a full breakdown of how long Wegovy can be out of the fridge on our dedicated guide. The Wegovy SmPC specifies a maximum of 28 days at room temperature, at or below 30°C. That is the outer limit, not a recommendation to habitually store pens on the kitchen counter. If the ambient temperature in your home or bag regularly exceeds 30°C (which matters in summer, in cars, or in some workplaces), the safe usable period is shorter. The temperature ceiling, not the day count, is the binding constraint.

A common misconception is that putting the pen back in the fridge after it has been at room temperature somehow resets the clock. It does not. The 28-day total runs from the moment the pen first leaves cold storage, regardless of how many times it returns. The Wegovy SmPC on the eMC is the authoritative reference here, and it is worth reading the storage section in full.

Step 2, check the pen before every injection

Before each dose, take a moment to look at the solution in the pen. Wegovy should be clear and colourless, or at most a very pale yellow. If it looks cloudy, discoloured, or contains visible particles, do not use it. The same applies if the pen has been dropped hard enough to damage the mechanism.

Temperature excursions do not always change how the solution looks, which is one reason the 28-day and 30°C limits exist even when the liquid appears fine. If you have any doubt about whether storage conditions were compromised (a bag left in a hot car, a pen accidentally placed in the freezer) the safest step is to contact your prescriber or pharmacist before proceeding. For people managing their injection routine day to day, our guide on keeping Wegovy out of the fridge covers the practical questions in more detail.

Used pens, including those with doses remaining, should be disposed of safely. A purpose-made sharps container is the appropriate way to dispose of used Wegovy pens in the UK, never a household bin.

Step 3, plan ahead for travel and daily life

Travelling with Wegovy is manageable with a little planning. Cabin luggage is preferable to the hold, where temperatures are unpredictable. A medical cool wallet (not a freezer pack, which risks freezing the solution) keeps pens within range on longer journeys. The NHS semaglutide page notes that storage guidance should be followed carefully, and the Patient Information Leaflet packed with every Wegovy pen repeats the same 28-day room-temperature limit.

For people who inject on a regular weekly schedule, the pen typically comes out of the fridge on injection day and goes straight back in. Storing a pen out of the fridge continuously for days or weeks is only necessary in specific circumstances, travel, or situations where a fridge is unavailable. If your lifestyle means pens frequently spend long periods at room temperature, mention it at your next clinical review. Your prescriber can factor it into advice about pen handling.

Questions about how long semaglutide pens of different types can be kept at room temperature follow similar principles, though always check the specific SmPC for the product you have been prescribed, as storage windows can differ between formulations. The needle gauge used with Wegovy and correct injection technique are separate practical details your prescriber can talk through if they are new to you.

What to do if you are not sure the pen is still safe

When in doubt, do not inject. Contact your prescriber or pharmacist first. A single missed dose is far less disruptive than injecting a compromised medicine. The NHS advises patients on semaglutide not to use a pen that has been stored incorrectly, and to check the NHS semaglutide medicines guide or the leaflet inside the box for storage reminders.

It is also worth knowing that you can report suspected product quality issues, including concerns about a pen's storage history during supply, through the MHRA Yellow Card scheme. That scheme exists for patients as well as clinicians, and using it helps regulators track real-world safety signals.

If your treatment is new or you are thinking about starting Wegovy through a regulated private route, our Wegovy overview covers eligibility, the clinical process and what to expect from treatment. When you are ready to explore whether it is right for you, you can check your eligibility with our prescribers, the consultation is free, and a real clinician reviews your answers, not automated software.