Wegovy przechowywanie: how to store your semaglutide pen correctly

The myth that trips most people up: room temperature is fine long-term

The most common misunderstanding about Wegovy is that storing it like any other medicine (on a shelf or in a bathroom cabinet) is acceptable. It is not, and this matters more than many people realise. Semaglutide is a peptide, not a tablet; its molecular structure begins to break down above 8°C over time. A pen left at room temperature for longer than the approved in-use window may look identical to a functioning one, but its potency will have fallen. You would not know by looking at it.

The fridge rule is straightforward in practice. Most people keep their unused Wegovy pens in the main body of the fridge, away from the back wall (where the temperature can dip below zero) and well clear of the ice box. The carton acts as a light shield, so keeping the pen inside it between weekly doses is a sensible habit. The NHS medicines guidance on semaglutide confirms refrigerated storage as the standard requirement and is the right starting point if you want an official plain-English summary of the rules.

If you are uncertain whether your pen has been stored correctly at any point, the safest decision is to contact your prescriber. Do not guess. A wasted pen is inconvenient; an ineffective dose at the wrong moment in your treatment is a larger problem.

The 28-day room-temperature window: what it means and what it does not

Once a Wegovy pen is in use (that is, once it has been activated or you have begun drawing doses from it), the licensed storage guidance allows a limited period at room temperature below 30°C. The figure cited in the product's summary of characteristics is up to 28 days. This window exists for practical reasons: most people do not want to carry a cool bag to work or a restaurant simply to administer a weekly injection.

Two things are worth being clear about here. First, this is a maximum, not a target, if you can keep the pen refrigerated throughout its in-use period, that remains preferable. Second, "room temperature" has a ceiling. A pen left in a car on a warm summer afternoon, on a sunny windowsill, or near a radiator is not at "room temperature" in the storage sense. Thirty degrees is easy to exceed in those conditions. For exact in-use timings, the Patient Information Leaflet that comes with your pen is the definitive source; the Wegovy SmPC on the eMC is the professional-level equivalent and is publicly accessible. Our frequently asked questions page covers several storage scenarios that patients ask us about regularly.

It is also worth noting that Wegovy comes in different dose strengths, each as its own pen. The journey through the titration schedule (starting at 0.25mg and stepping up over several months) means you may have more than one pen type in the fridge at a time, and if you are currently on the introductory dose you can find full guidance on the Wegovy 0.5mg pen alongside details for the 1mg strength and the 2mg strength. Keep them labelled and dated.

Freezing, light, and physical damage: the three things that end a pen early

Beyond heat, there are two other storage failures that render a pen unusable. Freezing is the first. If a Wegovy pen has been frozen (even briefly, even by accident at the back of an overcrowded fridge) it must not be used. The ice crystal formation that occurs inside the solution permanently alters the medicine's structure. Thawing does not reverse this. A frozen pen should be disposed of safely rather than injected.

Direct, prolonged light exposure is the second issue. Semaglutide is photosensitive; the original carton provides adequate protection. Leaving a pen on a bright windowsill for days, or removing it from its packaging for extended periods, is not good practice. Brief exposure for the purpose of injecting is fine.

Physical damage is the third. A cracked or visibly compromised pen should be treated with the same caution as a frozen one. The injection mechanism in a Wegovy pen is precise; if it has been dropped hard or the cartridge looks cloudy or discoloured, speak to your prescriber or pharmacist before proceeding. Our clinical team is available seven days a week for exactly this kind of question.

For anyone at the beginning of their journey with semaglutide, the broader Wegovy treatment overview sets out how the medicine works, what to expect from the titration schedule, and what eligibility looks like, a useful read alongside the storage detail on this page.

Travelling with Wegovy: keeping your pen cold when you are not at home

Travel is where storage discipline tends to slip, and it is one of the most frequent questions our prescribers hear. The short answer is: a small, portable cooling wallet or medical cool bag designed for insulin and GLP-1 medicines is the practical solution for journeys longer than a few hours. These are widely available and inexpensive relative to the cost of a wasted pen.

For flights specifically, Wegovy should travel in hand luggage rather than a checked bag. Aircraft holds are not temperature-controlled in the way cabin storage is, and checked baggage can be exposed to conditions that would damage the pen. Packing the pen in its carton, inside a cooling wallet, and carrying a brief note from your prescriber confirming the prescription (in English and ideally the local language for international travel) is sensible practice. Needles should be packed separately in a sharps container if you carry spares.

The cost of treatment is a reasonable concern when a pen is accidentally damaged or wasted. The Wegovy cost page sets out what private treatment involves financially, and our guide for people looking to start Wegovy explains the clinical assessment process that sits before any prescription is issued. Understanding the full picture (including how to protect the medicine once it arrives) is part of using it well. If you have a question about a specific travel scenario, our team is easy to reach.

If you are considering starting treatment or want a prescriber to review your current approach, speak to our prescribers through a free consultation at a time that suits you.