Wegovy: fridge or room temperature — what the guidance actually says

The myth worth correcting: 'my Wegovy is fine, it's been on the kitchen counter for weeks'

This is probably the most common storage misunderstanding our prescribers hear. The idea seems to be that because there's a room-temperature allowance, the pen can sit out indefinitely. There isn't a gentle way to put this: that's not how it works. The allowance exists for a defined, limited period, the kind of window that covers a weekend trip or a day without fridge access, not an extended stretch on the worktop. Once that window closes, the medicine may have degraded even if the pen looks completely normal. Semaglutide is a protein-based molecule; sustained warmth affects its stability in ways you can't see or smell.

The Patient Information Leaflet included with every Wegovy pen sets out the exact number of days permitted at room temperature. The Wegovy SmPC on the electronic Medicines Compendium (eMC) holds the same information in clinical detail. Those are the authoritative sources, not a forum post, not a rough estimate. Check the leaflet in your box and note the date you took the pen out of the fridge.

One practical tip: write the date on the pen barrel with a fine marker the moment it leaves the fridge. It takes three seconds and removes all guesswork.

What 'room temperature' actually means for Wegovy storage

Room temperature in storage guidance is not the same as 'whatever temperature your kitchen happens to be'. The eMC and the Patient Information Leaflet specify a maximum (typically expressed as 'below 30°C' or 'below 25°C' depending on the product and batch instructions) and that ceiling matters. A warm car dashboard, a bathroom cabinet near a radiator, or a windowsill in direct sun can all exceed it, sometimes by quite a margin. In those settings, even a pen within its permitted out-of-fridge window could be compromised.

The rules about temperature limits come from the manufacturer's stability data, real experiments that track whether the active ingredient holds its potency across defined conditions. There's useful NHS guidance on semaglutide storage on the NHS medicines page, which confirms the fridge-first principle and directs patients to the leaflet for specifics. If you're unsure whether your pen has been out too long, our guide on how long Wegovy can be kept at room temperature explains the limits clearly, and for a closer look at the conditions that count as acceptable, our page on whether Wegovy can be stored at room temperature walks through what the guidance actually permits. The practical upshot: keep the pen cool, keep it dark, and treat 'room temperature' as a strict upper bound rather than a loose description.

Never put Wegovy in the freezer, even briefly. A frozen pen should not be used. If yours has frozen accidentally, speak to your pharmacist before injecting.

Travelling with Wegovy: keeping things cold when a fridge isn't available

Travel is the scenario where storage questions come up most often, and it's genuinely manageable with a little planning. A small insulated medication wallet or a purpose-made insulin cooler can maintain the right temperature for several hours, useful for flights, train journeys, or a weekend away. If you're going somewhere hot, factor in ambient temperatures before assuming a hotel minibar is cold enough; many run warmer than 8°C.

For longer trips, it's worth confirming the exact room-temperature window in your leaflet before you leave. If your pen will be out of the fridge for longer than that window allows, carry a cooler or plan your injection timing around fridge access, and our guide on keeping Wegovy in the fridge covers the correct conditions for when you do have access to refrigeration. People managing weight with Wegovy often ask about the cost side of things too, our Wegovy cost guide covers what private treatment typically involves in the UK. Keeping your medicine in good condition means none of that investment is wasted.

Airport security is not a problem in principle: injectable medicines are permitted in hand luggage in the UK and most international jurisdictions, and the pen can travel with you rather than going in the hold (where cargo temperatures are unpredictable). Carry your prescription or a letter from your prescriber for customs peace of mind.

If something has gone wrong with your pen's storage

Accidents happen, a power cut knocks out the fridge overnight, or a pen is discovered having been left in a bag for longer than the permitted period. The right move is not to inject and hope for the best. Contact your prescriber or pharmacist. A degraded pen may still look identical to a good one, but injecting compromised medicine means missing a dose's worth of effect at best, and at worst introducing something your body wasn't expecting. If you're also uncertain about technique, our page on whether Wegovy needs to reach room temperature before you inject answers a question many patients have once they're ready to use a pen that has been stored correctly.

Our frequently asked questions page covers a range of practical situations like this, and our prescribers are available for aftercare seven days a week. If you believe a fault occurred during delivery rather than storage at home, that's a conversation for your dispensing pharmacy. For anyone considering whether Wegovy might be the right treatment to begin with, the Wegovy treatment guide sets out the full picture on eligibility, how the medicine works, and what to expect, and our weight-loss treatment overview is a good starting point if you're still weighing up options. When you're ready to speak to a prescriber, checking your eligibility through a free consultation is the straightforward next step.