How long can you store Wegovy, and what affects its shelf life?

You've had the pen in your bag all day, here's how to think about it

It happens to most people at some point. You packed your Wegovy pen meaning to inject before lunch, lunch got cancelled, and the pen has been sitting at the bottom of your bag in a warm office for six hours. The first thing to know is that a room-temperature window does exist, and carrying a pen for a reasonable period on a single day does not automatically mean you have to discard it, but the question of whether that pen is still suitable for use depends on the total time it has spent outside the fridge and the temperature it reached, both of which your leaflet addresses directly.

The NHS medicines page for semaglutide signposts patients to the Patient Information Leaflet and their pharmacist for storage queries, because these limits are product-specific. What the guidance is consistent on: once a pen has been frozen it cannot be recovered. If yours touched the freezer shelf or an ice pack directly, do not use it. Call your pharmacist.

A point worth clearing up gently: some people assume that because the liquid looks identical (same colour, no visible cloudiness) storage conditions haven't affected it. That isn't a reliable test for peptide medicines. Visual appearance cannot tell you whether the active molecule has degraded. The leaflet's time-and-temperature rules exist because the clinical evidence for those rules was generated in a controlled lab, not by looking at the pen.

What the fridge rules actually require day to day

The standard storage condition for Wegovy is refrigeration at 2–8°C, held there until use, up to the expiry date printed on the carton and pen. A few practical details matter here. The pen should not be stored in the door of the fridge where temperatures fluctuate with opening and closing, and it should not sit directly against the back wall where ice can form. A middle shelf is typically the most stable spot.

Once you have removed a pen from the fridge to inject, you do not need to bring it to room temperature first, Wegovy can be injected cool, though some people find a brief wait more comfortable. That is a comfort preference, not a clinical requirement.

If you want the specifics on keeping pens in the fridge across a longer treatment course, the guide on how long Wegovy can stay in the fridge covers that in more detail, and there is related information on how to store Wegovy more broadly for situations like travel and power cuts.

When storage goes wrong, and what to do

Storage failures fall into a few categories. A pen that was frozen accidentally, a delivery left on a doorstep in July, a fridge that broke down overnight, or a pen that was simply forgotten out of the fridge for longer than the permitted window. In every case, the right step is the same: do not inject it on the assumption it is probably fine. Contact your pharmacist or the person who prescribed your treatment.

For nume patients, priority aftercare support is available seven days a week for exactly this kind of practical question. It is also worth knowing that if a pen has genuinely been damaged by temperature, your prescriber needs to know before advising whether to delay your dose or replace it, skipping or delaying a weekly injection affects your titration schedule, and that is a clinical conversation, not a decision to make alone.

Disposal matters too. A damaged or expired pen should go into a sharps container rather than a household bin, with the needle safely covered. The Wegovy pen uses a covered-needle mechanism, but proper disposal into a sharps bin is still the right practice.

Semaglutide storage across different formats

If you are on the newer Wegovy tablets (oral semaglutide, approved by the MHRA in June 2026), storage is considerably simpler: no refrigeration is required. The tablets are kept at room temperature, making them a practical option for people whose refrigeration access is unreliable or who travel frequently. If you are considering which format suits your lifestyle, the full Wegovy overview covers both the injection and the tablet in one place.

For the injection specifically, storage guidance for semaglutide broadly is consistent whether the brand is Wegovy or Ozempic, though the latter is licensed for type 2 diabetes rather than weight management, as the semaglutide and Ozempic explainer sets out. The principles around refrigeration and room-temperature windows are the same class of medicine, but always follow the leaflet for your specific dispensed product.

If you are comparing semaglutide storage with tirzepatide (Mounjaro), our guide on how long semaglutide can be stored sits alongside the Wegovy-specific pages and includes detail on how long you can keep semaglutide in the fridge before it needs to be used or discarded. The storage science is similar, but the products have distinct SmPCs and the figures should not be assumed to be interchangeable.

If your current storage situation is making treatment difficult (or if you have questions about whether your prescription still fits your circumstances) speaking to a prescriber is the sensible next step. You can start a free consultation with our prescribers and get a same-day clinical review from a GPhC-registered Independent Prescriber.