Does Wegovy Need to Be in the Fridge — and What Happens If It Isn't?

What the official guidance actually says about Wegovy refrigeration

The storage instructions for Wegovy come from the medicine's Summary of Product Characteristics (SmPC), which Novo Nordisk is legally required to maintain and which sits on the electronic Medicines Compendium (eMC) alongside the Patient Information Leaflet. These are the authoritative sources, not forum posts, not general advice sites.

The headline rule is clear: keep the pen in a refrigerator at 2–8°C, and if you have ever wondered whether Wegovy needs to be kept in the fridge, the answer from the SmPC is an unambiguous yes. Do not store it in the freezer compartment or directly against the back wall of the fridge where temperatures can dip below zero. The carton matters too, it shields the pen from light, which can degrade biological medicines. Leaving the pen loose on a shelf without its box is a small but avoidable risk.

Room temperature is also addressed in the leaflet. The SmPC permits storage outside the fridge for a defined period under specific conditions, but the exact duration is something you should read directly from your own leaflet rather than rely on a general article, because formulation details and shelf-life calculations belong in the licensed document, not paraphrased online. If you have lost your leaflet, the NHS medicines page for semaglutide links to further guidance and your pharmacist can provide a replacement.

One practical note: if you order on a Friday or over a bank holiday, your pen will travel to you via next-working-day delivery and will be packed with appropriate thermal protection, but once it arrives, transfer it to the fridge promptly rather than leaving it in a bag until later in the day.

Temperature excursions, what actually goes wrong, and when to be concerned

Semaglutide is a protein-based medicine, and questions about whether semaglutide needs to be stored in the fridge reflect a genuine concern about keeping a biologic within its licensed conditions. Like all biologics, it is sensitive to conditions outside its licensed storage range. Heat accelerates the breakdown of the active molecule; freezing can cause physical changes to the solution that make the pen unusable or alter the dose delivered. Neither problem is necessarily visible to the naked eye, which is why you cannot simply inspect a pen and decide it is fine.

The situations that come up most often are straightforward: a pen left on the kitchen counter overnight, a bag forgotten in a warm car, or a short holiday where fridge access was limited. Whether any of these constitutes a meaningful excursion depends on the temperature reached and the duration, both of which are captured in the leaflet's room-temperature guidance. If the conditions stayed within those parameters, the pen is generally expected to be usable for the remainder of its allowance. If they clearly exceeded them (a hot car in summer, for instance, or a pen that sat next to a radiator) the right call is to contact your prescriber or pharmacist before injecting.

What you should never do is use a pen that has been frozen. Ice crystals can alter the structure of the solution, and no amount of warming it back up restores it reliably. A damaged pen is not a safe pen, regardless of how much of the treatment cycle remains.

If you have a question about a specific situation and are already a patient with us, our aftercare team is available seven days a week, you can reach us via the contact page.

Travelling with Wegovy: keeping cold without making it the focus of every trip

Travel is where storage questions get genuinely complicated, and it is one of the things our prescribers are asked about regularly. The principles are consistent with the SmPC rules: if the journey fits within the permitted room-temperature window, the pen can travel without special equipment. If it does not, an insulated cool bag or a dedicated medicine travel case keeps the pen within range without needing ice that could freeze it.

Airports add a specific consideration. In the UK, liquid medicines in quantities above 100ml require a pharmacist letter for security; a single pre-filled Wegovy pen is well under that volume, but carrying your prescription paperwork is sensible practice. Keep the pen in its carton. If you are flying somewhere with a very different climate (somewhere hot) plan for the arrival environment as much as the journey itself, because a hotel minibar does not always maintain a reliable 2–8°C.

For longer trips abroad where fridge access will genuinely be patchy, speak to your prescriber before you travel rather than improvising on the day. A short break in a temperate climate is a very different situation from three weeks in a country with unreliable refrigeration, and it is worth reading up on whether Wegovy needs to stay in the fridge throughout a trip so you understand exactly where the limits lie. The FAQs on our site cover some common travel questions, and the clinical team can advise based on your specific itinerary.

It is also worth confirming, well before you leave, that you have enough pens to cover the trip plus a few days' margin. Running out abroad and trying to source Wegovy overseas is not straightforward, supply, licensing, and verification of authenticity all become harder. The Wegovy overview page gives a fuller picture of how the treatment works and what to expect across a course of treatment.

When cold-chain matters most, and what it tells you about choosing a pharmacy

The fridge requirement is not just a storage detail; it is a signal about the supply chain the medicine has passed through, and understanding where Wegovy goes in the fridge is part of handling it correctly once it arrives. A pen that has been stored and transported correctly from the point of manufacture to your door will arrive within its licensed conditions. One sourced from an unregulated seller (particularly via social media or websites that offer these medicines without a clinical assessment) may have been stored in conditions that were never monitored.

The MHRA has warned publicly and repeatedly about fake and illegally traded weight-loss pens, including counterfeit tirzepatide manufacturing sites uncovered in the UK. Knowing whether you need to store Wegovy in the fridge is straightforward once you have a legitimate, properly labelled pen with its full documentation intact, but that documentation simply does not exist when a product comes through unregulated channels. You can verify any registered pharmacy at the GPhC pharmacy register.

At nume, every pen dispatched from our GPhC-registered pharmacy (registration number 9012878, verifiable directly at the register) travels in tracked, temperature-appropriate packaging via DPD. That is part of what legitimate, regulated supply looks like. If you are curious about how we compare to a standard GP or specialist referral, the weight loss treatment overview sets out the routes clearly. For those considering starting treatment, or with questions about whether Wegovy is clinically appropriate for them, a free consultation with our prescribers is the right place to begin.