What temperature does Wegovy need to be kept at — and what really happens if it warms up?

The myth worth correcting first: 'a few hours out of the fridge won't matter'

This is probably the most common assumption patients make, and it is understandable, a lot of medicines sit perfectly happily on a shelf. Wegovy is different. It is a biological medicine: semaglutide is a peptide that can lose potency when temperature control slips outside the permitted range. That does not mean a short period at room temperature ruins a pen (the Patient Information Leaflet does allow a defined window) but the idea that temperature is irrelevant until the liquid looks different is wrong. You cannot see degraded semaglutide. The solution stays clear throughout, even if the medicine has been compromised.

The practical upshot: check the leaflet, note the date you took the pen out of the fridge, and stick to the stated limit. If you have exceeded it, or if you are unsure whether you have, contact your prescriber or pharmacist rather than guessing. A degraded pen is not just a waste of money; it means a week passes without effective treatment. For a fuller picture of how Wegovy works and what the clinical programme found, the essential Wegovy overview on this site covers the basics in plain English.

The cold end of the scale matters just as much as the warm end

Refrigerators are not uniform environments. The back of a fridge shelf, especially one near the cooling element, can dip below 2°C, and a pen that freezes must be discarded even if it is thawed and looks normal. Freezing disrupts the structure of peptide medicines in ways that cannot be reversed by warming the pen back up. This is not a theoretical risk: it happens in practice, particularly when pens are stored on the highest shelf in a chest fridge or pushed to the back of a standard one.

Practical steps that help: keep pens in their original box (which also protects them from light), store them on a middle shelf or in the salad drawer where temperature is more stable, and keep them away from the freezer compartment entirely. If you share a fridge with family members, it is worth labelling the box clearly, not least because a Wegovy pen and an insulin pen can look broadly similar at a glance, and mixing them up would be a serious error. The detailed guide on how cold Wegovy needs to be covers freezing scenarios and fridge troubleshooting in more depth.

What happens when travel, power cuts or timing gets in the way

This is where real life intervenes. Weekends away, flights, power cuts, holidays, or simply forgetting to check whether a pen is still within its room-temperature window, these situations come up for most patients at some point. A few principles apply across all of them.

Travelling: insulated cool bags with ice packs are widely used for short journeys. Pens should never be placed directly against an ice pack (which could freeze the tip of the pen), and they should not be put in checked luggage on a flight, where temperatures in the hold can vary wildly. Most travel pharmacies stock cooling wallets designed for injectable medicines. If you are away for longer than the room-temperature window allows (say, a two-week holiday where refrigeration is uncertain) talk to your prescriber before you go, not after. Planning a Sunday injection around a Monday order, or timing your next supply before a payday or a holiday weekend, is exactly the kind of thing worth raising when you speak to your clinical team.

Power cuts: if your fridge loses power, note the time it went off. A short outage of a few hours within a stable home temperature is usually fine, but if the fridge warms significantly or the outage runs long, check with your pharmacist. The rule is: if in doubt, do not use it. For a sense of the broader Wegovy treatment journey and what to expect at each stage, the Wegovy treatment page is a good reference. If you are also thinking about how injection timing fits into your weekly routine, the guidance on whether Wegovy needs to be taken at the same time each week may be useful alongside this.

The Wegovy pill: no fridge needed

Since June 2026, there has been a second form of Wegovy available in the UK: the oral semaglutide tablet, approved by the MHRA as the first GLP-1 medicine licensed for weight management in tablet form. One practical difference from the injection is that the tablet does not require refrigeration. It is stored at room temperature, which removes the cold-chain concern entirely for patients who find that aspect of the injection format complicated.

The tablet is taken once daily, first thing in the morning on an empty stomach with a small amount of plain water, and you wait at least 30 minutes before eating, drinking anything else, or taking other oral medicines. The licensed dosing schedule escalates from 1.5mg to a 25mg maintenance dose, with at least a month at each level. Trial data (OASIS 4, 64 weeks) showed an average weight loss of around 13.6% versus 2.4% with placebo; among participants who stayed fully adherent, the figure was closer to 17%. Whether the injection or the tablet is the right fit for you depends on your circumstances and your prescriber's assessment. You can check your eligibility with our prescribers at any point, consultations are free, and a named GPhC-registered Independent Prescriber reviews each one the same day.

For context on how Wegovy's cost works alongside its storage and practical demands, the Wegovy price comparison page sets out what a private prescription typically includes in the UK. And if you are curious where the highest licensed dose sits for the injection format, the page on what Wegovy goes up to covers the approved strength ceiling, including the newer 7.2mg pen.

Storage details for your specific pens are always in the Patient Information Leaflet. The NHS semaglutide patient page also includes storage guidance as part of its practical advice on using the medicine. If you have questions your leaflet does not answer, the right person to ask is a pharmacist or your prescriber, not a forum. That is not a caveat; it is genuinely the fastest route to the right answer for your specific pen and situation.