How Long Can Wegovy Be Refrigerated — and What Happens When It Isn't?

How long does a Wegovy pen stay usable in the fridge?

An unopened Wegovy pen stored continuously at the correct refrigerator temperature of 2°C to 8°C remains usable until its printed expiry date. That expiry is stamped on both the outer carton and the body of the pen itself, so there are two places to check. In practice, pens dispensed through a regulated pharmacy will have months of refrigerated life remaining, but checking the date when your pen arrives is still a sensible habit.

The 2°C to 8°C range matters. A fridge running warmer than 8°C is not meeting the storage requirement, and a pen accidentally pushed against the freezer section or ice compartment and frozen is no longer suitable for use. Semaglutide, the active ingredient in Wegovy, can degrade when it freezes, and a degraded solution will not look obviously different in the pen. The NHS medicines guidance for semaglutide is clear that frozen pens should be discarded rather than used.

Keep the pen in its original packaging while it sits in the fridge, the outer cardboard provides a degree of protection from light. If you have ever wondered whether Wegovy is refrigerated and why that requirement exists, the short answer is that semaglutide is a peptide-based medicine that needs consistent cold storage to remain stable. Many people tuck the box in the fridge door, which is convenient, but door shelves can experience wider temperature swings when the fridge is opened repeatedly. A shelf inside the main compartment, away from the back wall, is a steadier spot.

What changes once you take the pen out of the fridge?

Once removed from refrigeration, a Wegovy pen can be stored at room temperature for a limited period, but the exact number of days is set out in the Patient Information Leaflet that comes with your pen, and that leaflet is always the document to follow. This page does not state that figure because it can vary between product batches and pen formats, and because the unrefrigerated window for Wegovy deserves its own careful reading rather than a headline number lifted from a knowledge base.

What is consistent: once the room-temperature period runs out, the pen should not be returned to the fridge and used later, it should be disposed of safely. And if you cannot remember when you took it out, treating it as unusable is the cautious approach your prescriber would support.

Light and heat are the main risks outside the fridge. If you want a fuller picture of how long Wegovy can safely be out of the refrigerator before it must be discarded, that guide walks through the practical scenarios in detail. Keep a pen-in-use away from windowsills, car dashboards in summer, and anywhere it might be directly exposed to sunlight. A cool, dark place (a bedside drawer, for example) is more suitable than a bathroom cabinet that heats up during a shower.

Does it matter which Wegovy format you have?

Wegovy has been available as a standard pre-filled injection pen, and the MHRA approved a dedicated single-dose 7.2mg pen in April 2026 for adults with a BMI of 30 or above. Both formats contain semaglutide and share the same general cold-chain principle, and a closer look at whether Wegovy needs to be refrigerated across both pen formats confirms that the storage requirement applies equally regardless of which version you have been prescribed. The room-temperature limit is confirmed in the leaflet accompanying that specific pen. The Wegovy treatment overview at nume covers how the different dose levels fit into the overall titration schedule.

If you are considering Wegovy or have questions about how your current treatment is being stored and managed, our clinical team reviews consultations personally, a real prescriber reads your answers, not an automated system. For those wondering how treatment costs sit alongside storage practicalities, the Wegovy price comparison page sets out what a legitimate private prescription typically includes.

When should you call your prescriber about a storage problem?

If something goes wrong (a power cut overnight, a pen left in a hot car, or a fridge that stopped working) the right move is to contact your prescriber or pharmacist before injecting. This is not an overreaction; it is exactly the situation a prescriber is there to help with. A pen that looks fine may still be unsuitable if its temperature history is uncertain.

For pens that have clearly been frozen, or left in direct light or heat for an extended period, the advice is consistent across the Wegovy SmPC on the eMC and NHS guidance: do not use them. Discard the pen using a dedicated sharps container rather than placing it in general household waste.

Suspected side effects from any GLP-1 medicine, including concerns about whether a compromised pen contributed to an unexpected reaction, can be reported via the MHRA Yellow Card scheme. Reports from patients are welcomed and help regulators track real-world safety signals.

If you are new to Wegovy or exploring whether it suits your circumstances, check your eligibility through a free consultation with our prescribers, the process takes only a few minutes to start.