Can Wegovy be kept at room temperature — and for how long?

What the SmPC establishes, and why the exact figure lives there, not here

The Wegovy SmPC, published on the electronic Medicines Compendium (eMC), gives the current, manufacturer-verified room-temperature limit. We do not print that figure in this article deliberately. Pharmaceutical guidance is updated between print runs and digital refreshes; the only version that is always current is the leaflet inside your box. That said, the principle is consistent: there is a defined upper temperature (typically cited as no more than 30°C) and a defined number of days, and the clock starts the moment the pen leaves refrigeration, not the moment you first use it.

A question our prescribers hear most weeks is whether a pen can go back in the fridge after it has been left out. The answer is no. Once a pen has been stored at room temperature, that period counts toward the total permitted window regardless of whether it then returns to 2–8°C. The NHS patient information for semaglutide on the NHS medicines pages reinforces this: follow the storage instructions in the leaflet and contact a pharmacist if in doubt. Returning a pen to the fridge does not reset the clock.

Direct sunlight and freezing temperatures are separate risks. A pen left on a sunny windowsill, in a hot car or placed in a freezer compartment by mistake is compromised before the room-temperature window becomes relevant. Frozen Wegovy must not be used even if it has thawed, the SmPC is unambiguous on this point.

Practical situations where this matters most

Most people who ask about room-temperature storage are not being careless, they are navigating real life. A few scenarios come up repeatedly.

Travel. Flights, long drives and hotel rooms all interrupt fridge access. A cool bag with ice packs (avoiding direct ice contact with the pen) is the practical answer for journeys; purpose-built travel cases for insulin and GLP-1 pens are widely available. For flights, keep the pen in hand luggage, hold temperatures can drop below freezing. If you are weighing up whether to keep Wegovy in the fridge or at room temperature during your journey, checking the permitted window against your total transit time before you leave home is essential, and you should carry the Patient Information Leaflet with you.

Power cuts and fridge failures. If your fridge has been off for an unknown period, count from the last time you are certain the temperature was correct, not from when the power came back. When the period is genuinely unknown, the cautious path is to contact your pharmacist. A single unused pen is replaceable; an adverse event from a degraded medicine is not a trade-off worth making.

Injection timing. Some people prefer to let the pen sit at room temperature for a short period before injecting, which can reduce discomfort at the site. There is a practical guide to whether Wegovy needs to reach room temperature before injection if that is what you are weighing up, it is a different question from long-term storage.

What counts as spoiled, and what to do

Wegovy is a clear, colourless solution. The SmPC advises inspecting the pen before each injection: do not use it if the liquid looks cloudy, discoloured or contains particles. Visible changes can indicate protein degradation, which heat accelerates. If you are unsure about the limits that apply, our guide to how Wegovy behaves at room temperature explains what the permitted conditions mean in practice, because the absence of visible changes does not, on its own, confirm that a pen stored outside its permitted window is still effective, and potency can decline without any visual sign.

If you have any doubt about whether a pen is still within its permitted window, contact your prescriber or a pharmacist. This is not bureaucratic caution; degraded medicine may simply not work, which matters if you have timed your dose around eating patterns or a repeat prescription date. You can also raise concerns about your current treatment through the nume aftercare team, our prescribers are available seven days a week.

Disposal matters too. A pen that has passed its room-temperature window should go into a sharps container, not household waste or a standard recycling bin, because the needle tip remains a risk even on a pen that has not been used. Your local pharmacy can take sharps containers for safe disposal.

When to think about whether your storage setup is working

A consistent storage routine is one of those small things that pays back in confidence. A designated spot in the main fridge body (not the door, which fluctuates) away from the ice compartment and out of reach of children is the standard recommendation. If you are wondering whether Wegovy can be stored at room temperature as a longer-term solution, perhaps because fridge space is genuinely a constraint or your home environment is regularly above 25°C in summer, it is worth discussing this with your prescriber at your next clinical review.

For a broader look at how Wegovy fits into a private weight-management plan, the Wegovy treatment overview covers eligibility, how the medicine works and what the STEP 1 trial reported about average weight reduction. And if you are comparing semaglutide storage with other GLP-1 medicines, the page on semaglutide room-temperature storage covers the broader picture across formulations.

If you are still considering whether Wegovy is clinically right for you, a free consultation with nume's prescribers is the practical next step. Check your eligibility and start your free consultation.