Is Wegovy kept in the fridge — and what happens if it isn't?

The misconception: room temperature is fine because the pen feels stable

A lot of people assume that because a Wegovy pen looks and feels unchanged after a few hours on the kitchen counter, the medicine inside is unaffected. That assumption is worth correcting early. Semaglutide is a protein-based medicine and, like many biologics, its stability depends on consistent cold storage. The 2–8°C refrigeration requirement is not bureaucratic caution, it is the condition under which Novo Nordisk demonstrated the medicine remains within its licensed specification until the expiry date printed on the pen.

What this means practically: an unopened pen left at room temperature for longer than the leaflet permits may have degraded potency, with no visible sign. You cannot tell by looking at it. The liquid typically remains clear and colourless whether the medicine is intact or compromised, which is exactly why the storage rules exist.

If you are uncertain whether a pen has been outside the recommended conditions for too long, contact your prescriber or pharmacist rather than using it and hoping. That conversation costs nothing; using a compromised pen costs a dose and potentially your progress. For a fuller look at what happens when storage goes wrong, our page on what to do if your Wegovy was not kept in the fridge covers the specific steps to take.

The fridge rules in full: where your pen should actually live

Before first use, every Wegovy pen should be stored in a fridge at 2–8°C and kept away from the freezer compartment and from the fridge door's coldest zones. The fridge door is actually a reasonable spot for many households (it tends to stay within range) but avoid placing pens directly against the back wall or freezer plate where temperatures can dip below 2°C.

Once a pen has been used (or once a pen has been removed from the fridge for use), the Patient Information Leaflet states how long it may remain at room temperature. If you want a clear answer to whether Wegovy has to be kept in the fridge, our dedicated page sets out exactly what the requirements are and when they apply. With Wegovy now available in both the standard weekly injection pen and the higher-dose 7.2mg pen approved by the MHRA in April 2026, the right move is always to check the leaflet for the format you have been dispensed.

In the meantime, a practical routine helps: keep your unused pens at the back of a middle shelf, away from the freezer zone, and note the date you first remove each pen. Many patients find it easier than they expected once it becomes part of the weekly rhythm.

What genuinely damages a Wegovy pen

Three things cause real, irreversible harm to the medicine: freezing, prolonged heat, and direct sunlight. A pen that has frozen, even briefly, must not be used, the protein structure of semaglutide can be damaged in ways that are not visible to the eye. Do not try to thaw it and carry on. This is one of the more important points our prescribers raise with patients who are travelling or who store medicines in garages and outbuildings during winter.

Prolonged heat is the summer hazard. A pen left in a car on a warm day, sitting on a windowsill in direct sun, or stored near an oven or radiator can exceed safe temperature limits quickly. Even a temperature that feels mild to you can be damaging to the medicine over time. If you are unsure whether a pen has been exposed to heat, the guidance is the same as for freezing: do not use it; contact your prescriber or pharmacist.

Questions about longer absences (holidays, travel abroad, situations where a fridge is not available) are worth raising at your consultation. The question of how long Wegovy can be out of the fridge has specific, leaflet-defined limits that your prescribing team can walk you through in the context of your plans. For those also considering how semaglutide storage compares across different products, the broader semaglutide storage guide sets out the full picture.

Wegovy tablets: a different story entirely

If you have been prescribed the Wegovy tablet (the oral semaglutide approved by the MHRA in June 2026 as the UK's first licensed oral GLP-1 medicine for weight management) storage is considerably simpler. The tablets do not require refrigeration. They are stored at room temperature, which makes them genuinely travel-friendly and removes the fridge dependency entirely. Before the kettle has boiled is, for many patients, the natural cue to take the daily tablet: first thing in the morning, on a completely empty stomach, with a small amount of plain water, at least 30 minutes before food, drink or other medicines.

If you are weighing up whether the injection or the tablet is the right format for your circumstances, that is exactly the kind of practical question worth raising during a consultation. Storage logistics, routine, and how each format fits your day are all part of the picture a prescriber considers. You can explore the full range of options on our Wegovy treatment overview, or compare weight-loss treatment options more broadly. The cost side of things is covered on the Wegovy cost page if that is useful context.

These are prescription-only medicines, a clinician assesses whether treatment is appropriate and which format suits you. If you would like that assessment, speak to our prescribers through a free consultation.