How Long Can You Keep Wegovy in the Fridge?

You open the fridge, pen in hand, and wonder: is this still fine?

It happens to almost everyone on a weekly injection. You pull out your Wegovy pen, notice it has been sitting at the back of the fridge for three weeks, and suddenly feel uncertain. The short answer for an unopened pen: if it has been refrigerated at 2–8°C throughout, it is good until the expiry date. That date is printed on the pen itself and on the outer packaging. Provided the pen has not been frozen, shaken hard against ice blocks, or left near the freezer compartment where temperatures can dip below 2°C, the medicine is stored correctly.

A common misconception worth letting go of gently: many people assume the fridge is just for safety and that a few days at room temperature before opening does no real harm regardless of duration. That is not accurate. Semaglutide is a peptide medicine that degrades when exposed to warmth for longer than the manufacturer specifies, and if you are curious about how semaglutide injection works as a generic medicine, that page explains the formulation in more detail. The fridge is not a formality, it is what keeps the medicine stable.

For the precise out-of-fridge window, your Patient Information Leaflet is the definitive source. The NHS medicines page for semaglutide confirms that Wegovy should be stored in a refrigerator, and always refers patients to their leaflet for the specific room-temperature duration, because it varies by pen format and can be updated when formulations change. If you have ever stood at the fridge door wondering whether you do actually need to keep Wegovy in the fridge, that page gives a clear, practical answer. If you want to understand whether you have to keep Wegovy in the fridge and why the rules exist, that page covers the full reasoning.

Why the leaflet number matters more than anything you read online

The Patient Information Leaflet is a regulatory document, updated whenever the manufacturer submits new stability data to the MHRA. Any figure you find on a forum, a social post, or even a well-meaning health website may be out of date or apply to a different semaglutide product. Rybelsus (oral semaglutide for type 2 diabetes) and Wegovy injections are both semaglutide, but they have entirely different storage requirements. Ozempic, the diabetes injection, has its own leaflet too. A figure that is correct for one of these is not automatically correct for another.

This matters practically. If you are wondering how long Wegovy can stay out of the fridge once you have removed it, the leaflet specifies both the maximum duration and the maximum temperature it can tolerate during that period. Keep a note of the date you first took the pen out. Some people write it on the outer carton with a marker; others set a phone reminder. Either way, if the pen exceeds the room-temperature window before you have used all four doses, it should be discarded and a replacement arranged with your prescriber.

Storage conditions also affect whether a dose increase is appropriate, part of the reason nume... sorry, the reason a prescriber reviews your progress before each supply. At nume, that clinical review happens before every repeat order, not just at the start.

Freezing, light and other things that end a pen's useful life

The fridge is the right home for Wegovy, but the wrong part of the fridge can cause problems. Pens stored directly against the back wall or tucked beside an ice-making compartment can freeze. A frozen pen (or one that has been allowed to thaw after freezing) must be discarded. There is no safe way to restore a pen that has been frozen, even if it looks unchanged. Semaglutide's molecular structure is altered by ice crystal formation in a way that is invisible to the eye.

Light is a secondary concern. Keep pens in their original carton inside the fridge; the carton is there partly to block light exposure. Similarly, never store a pen in a car glove box, a sunny windowsill, or near a radiator. If you travel and need to carry Wegovy without a fridge, there are specific conditions under which this is safe for a limited time, again, the leaflet defines those conditions, not general guidance online.

Once a pen is exhausted, the needle should be removed before disposal. A properly labelled sharps container is the right way to dispose of used needles safely, never in general household waste. Your local pharmacy can advise on sharps collection in your area.

How to check your supply is stored correctly before each dose

Before every injection, run through a brief visual check. The solution should be clear and colourless. Any cloudiness, particles, or visible discolouration means the pen should not be used and your prescriber should be informed. The same applies if the pen has been dropped onto a hard surface, even if it looks intact, internal damage is possible.

If you are unsure whether your pen has been stored correctly (perhaps you came home to find the fridge had cut out overnight) do not inject and do not guess. Contact your prescriber or pharmacist the same day. For broader questions about your Wegovy treatment, our FAQs cover many of the practical situations patients ask about, and our aftercare team is available seven days a week via our contact page.

How long semaglutide keeps in the fridge ultimately comes down to two things: the expiry date for an unopened pen, and the manufacturer-specified room-temperature window once you have taken it out. Both are in the leaflet. If you are exploring what Wegovy involves as a treatment or considering whether it might be appropriate for you, a free consultation with our prescribers is the right starting point. The consultation is free, reviewed the same day by a GPhC-registered prescriber, and there is no obligation.