Do I Need to Refrigerate Wegovy — and What Happens If I Don't?

So do you actually need to refrigerate Wegovy the whole time?

The short answer is: yes for storage, but not necessarily in the final window before use. The fridge is where your unopened pens live, 2°C to 8°C, ideally on a middle shelf rather than pressed against the back wall where temperatures near the freezing element can fluctuate. Freezing is the thing to avoid absolutely. A frozen pen, even one that has thawed, should not be injected; the formulation can be damaged in ways that are not visible to the eye.

Once you have administered your first dose from a pen, the room-temperature clock starts. At that point keeping Wegovy refrigerated is no longer mandatory, though returning it to the fridge is perfectly fine if that is more convenient. The critical constraint is the upper temperature limit (30°C) and the number of days allowed at room temperature. That figure varies slightly between pen formats, so the PIL is the definitive reference. If you are unsure which version applies to your pen, our FAQs cover common storage queries, or you can contact your prescriber directly.

One misconception worth clearing up gently: some people assume that because the pen feels cold from the fridge, it must be injected immediately. It does not. Letting the pen sit at room temperature for around 30 minutes before injecting is widely recommended to reduce injection-site discomfort, and if you are still wondering whether you have to refrigerate Wegovy throughout treatment, your PIL will confirm the full details on this.

What happens if Wegovy gets warm or is left out too long?

Temperature excursions are more common than people expect: a pen left on a windowsill, tucked into a bag during a long journey, or briefly stored in a hotel minibar that turns out to be a freezer rather than a fridge. The eMC (the electronic Medicines Compendium) hosts the full Wegovy Summary of Product Characteristics, which sets out exactly what constitutes an acceptable excursion and what does not.

As a rule: if a pen has been above 30°C or has frozen, do not use it. The active ingredient, semaglutide, may degrade in ways that are not apparent from the pen's appearance, the liquid can still look perfectly clear. Using a compromised pen is not simply a matter of reduced efficacy; it carries genuine uncertainty about what you are injecting. Dispose of the pen in a proper sharps container and contact your prescriber to discuss a replacement.

If you are ever in doubt (perhaps you returned from a holiday and are not certain how warm your luggage got) the right call is always to ask rather than assume. A real clinician reviews every query at nume; you are not routing your question through an automated system.

How should you handle Wegovy when travelling?

Travel is where storage discipline gets tested. Airline cabin luggage is the right place for your pen, hold baggage can reach sub-zero temperatures at altitude, and a frozen pen is unusable. A TSA-style medical exemption note is not legally required in the UK, but a letter from your prescriber confirming the medicine and your identity can smooth things considerably at security. For context on whether Wegovy needs to stay refrigerated during a trip, the room-temperature window gives you meaningful flexibility for short journeys without special equipment.

Insulated cool bags with ice packs are the standard travel solution for longer periods. Keep the pen away from direct contact with ice, wrapping it in a cloth layer protects against accidental freezing. Many pharmacies stock travel cool wallets designed for injectable medicines.

If you are managing a long holiday, it is worth discussing storage logistics with your prescriber before you leave. They may be able to time your supply so you are not carrying multiple unopened pens, which simplifies the cold-chain challenge considerably. Wegovy's full prescribing and support picture is something our clinical team at nume works through with every patient individually.

Does the new Wegovy 7.2mg pen change anything about storage?

The MHRA approved a dedicated single-dose 7.2mg Wegovy pen on 14 April 2026, a higher-dose option for eligible adults who have titrated up from the standard starting dose. From a storage perspective, the fundamentals remain the same: refrigerate until use, respect the room-temperature window, never freeze. The pen's mechanism differs (it is a single-injection pre-set device with a covered needle that locks after use), but the semaglutide formulation has the same cold-chain requirements as earlier pen formats.

Specific availability of different pen formats is confirmed at consultation rather than guaranteed in advance, supply can vary. If you are currently on treatment or considering starting, the amount of semaglutide in each Wegovy pen and how formats differ is a useful piece of background. For an overview of what private treatment costs, the Wegovy pricing page sets out what is included in a single transparent price at nume. When you are ready to speak to one of our prescribers, starting a free consultation is straightforward.