Do You Have to Keep Wegovy Refrigerated — and What Happens If You Don't?

What the licensed guidance establishes about Wegovy and refrigeration

The storage requirements for Wegovy are drawn from the approved Summary of Product Characteristics, the same document that governs how prescribers and pharmacists handle the medicine. The NHS semaglutide medicines page reflects this: store pens in a refrigerator between 2°C and 8°C. That upper limit matters because temperatures above 8°C (even briefly and repeatedly) can degrade the medicine. The lower limit matters too: freezing inactivates semaglutide, and a pen that has been frozen is not safe to use.

What the guidance also establishes is that a pen does not have to return to the fridge immediately after each use. A specific room-temperature window is permitted, subject to the pen remaining capped, protected from light, and stored below a defined temperature ceiling. The precise figures are in the leaflet inside your packaging, and they vary by product iteration, which is why repeating a single number here would be misleading. Read your leaflet. If you are unsure about a pen's history, your pharmacist can advise you without needing to see you in person.

One practical detail worth knowing: many people keep their current pen in the fridge door rather than the body of the fridge, where temperatures can dip closer to freezing near the back. The door shelf tends to be more stable, away from the cooling element. That said, if your fridge runs warm, use a thermometer to check, and if you want to understand whether Wegovy has to stay refrigerated at all times, including what the room-temperature window actually permits, the guidance is more nuanced than a simple yes or no.

What happens if Wegovy is left out too long or stored incorrectly

Temperature excursions are the most common real-world storage problem, and they come in two forms: too cold (freezing) and too warm (prolonged room temperature or heat exposure). Freezing breaks down the protein structure of semaglutide; a pen that has gone below 0°C should be discarded, not used in the hope that it warmed back to normal. Prolonged warmth similarly degrades the active ingredient, though the effect is gradual rather than immediate.

If your pen has been left out of the fridge for longer than the window specified in your leaflet, the honest answer is: do not use it without checking first. Contact your pharmacist. The cost of a replacement pen is considerably less consequential than injecting degraded medicine or, worse, experiencing unexpected side effects because the dose was inconsistent. This is also a reason to think ahead about travel, and if you are wondering whether you need to keep Wegovy refrigerated throughout your trip, the answer depends on the duration and conditions involved, not a blanket rule.

You can find further practical questions about storage, missed doses and pen handling covered in our patient FAQs. Any question that touches on your specific dose, your health history, or a pen you're concerned about should go to your prescriber directly.

Travelling with Wegovy: keeping refrigeration consistent on the move

Travel is where Wegovy's storage requirements become most practically challenging. Airlines classify semaglutide as a prescription medicine, which means it must travel in hand luggage with supporting documentation, a dispensing label or a letter from your prescriber is normally sufficient, though checking your airline's policy in advance is sensible. It should never go in checked baggage, both because of temperature unpredictability in cargo holds and because of the risk of loss.

For short trips (a weekend away, a day at the office) the room-temperature window (see your leaflet) often covers you without any special equipment, and a common question at this point is whether you have to refrigerate Wegovy at all during a brief trip, which depends on how long you will be away and what temperatures you expect. For longer journeys, a purpose-made insulin cooler or a gel-pack cool pouch keeps pens within range without freezing them. Gel packs pulled straight from a home freezer can drop a pen below 0°C if placed directly against it; wrap them in a cloth layer. At your destination, a hotel fridge is fine, but check the dial, many are set colder than 2°C by default.

If you are exploring what Wegovy involves more broadly, including how a private prescription works and what clinical assessment looks like, that overview covers the full picture. For anyone weighing up whether private treatment is right for them, our Wegovy pricing page explains what a legitimate prescription includes. Treatment is a prescription-only medicine, and any legitimate route starts with a clinical assessment, not just a purchase.

When to ask your prescriber rather than rely on general guidance

Storage questions sound administrative, but they are genuinely clinical in some situations. A pen that has been through a temperature excursion of unknown duration, a pen that looks cloudy or discoloured, or one where the mechanism feels different, these are reasons to contact a pharmacist or prescriber before injecting, not to rely on a general rule. The NHS semaglutide guidance is clear that patients should inspect the solution before use: it should be clear and colourless to slightly yellow. A question we hear often at this stage is whether Wegovy has to be refrigerated, and while the short answer is yes for long-term storage, the fuller answer covers what to do when you are between injections or away from home.

At nume, a real prescriber reviews every consultation, a clinician reads your case, not software. That same access extends to aftercare: if a storage concern comes up between injections, our team is available seven days a week. For people transferring from another provider or starting treatment for the first time, starting a free consultation is the right first step. We dispatch to your door via tracked next-working-day delivery, in plain packaging, once your prescription is approved. Worth knowing if you've been managing fridge logistics from a clinic pick-up.

Questions about related injectable weight-loss treatments, including how semaglutide compares to other options, are covered on our weight-loss treatment overview. Storage requirements differ between medicines, so it is worth checking the specific guidance for whichever treatment your prescriber recommends.