Does Wegovy Require Refrigeration — and What Happens If the Cold Chain Breaks?

Why the cold chain exists for Wegovy

Semaglutide is a protein-based medicine. Like many biological medicines, heat and freezing both degrade the active compound in ways that are invisible to the eye, the liquid in the pen can look perfectly normal even when the medicine is no longer effective. This is why the 2–8°C fridge requirement isn't a bureaucratic caution; it is what keeps the medicine stable until you inject it.

The pen itself is robust enough for short periods outside the fridge, and the licensed timeframe for room-temperature storage is specified in the Patient Information Leaflet rather than estimated here, because Novo Nordisk and the MHRA have set a precise window that applies to the current formulation. That window is the number to trust, not a neighbour's advice or a forum post. Keep the leaflet in the box and refer to it each time the pen comes out of the fridge.

One practical note: freezing is an absolute no. If a pen has accidentally gone below 0°C (perhaps it ended up touching the back wall of a fridge with a freezer setting running too cold) it should be discarded. A frozen-then-thawed pen is not safe to use, and there is no visual way to verify it has recovered. If you are uncertain, speak to a pharmacist before injecting.

Room-temperature windows: what the leaflet is actually telling you

Most people pick up their Wegovy pen on a Monday, keep it in the fridge door, and inject it later in the week. That is a straightforward scenario. The room-temperature rule becomes relevant in less routine situations: you are travelling, the pharmacy delivered while you were out and the parcel waited on a warm doorstep, or you simply left the pen on the counter and aren't sure how long it has been there.

The rule to apply is: check the date you first removed the pen from the fridge and compare it against the window in your leaflet. If you are within that window and the pen has been below 30°C (away from direct sunlight, not left in a hot car) you can still use it. If you genuinely cannot account for the temperature during that period, the cautious choice is to contact your prescriber or pharmacist. A single missed dose, while not ideal, is manageable; injecting a compromised pen is a different kind of risk. Our full guide to Wegovy refrigeration covers the exact scenarios and what to do in each, including the complete refrigeration requirements for the current formulation.

For anyone planning ahead (holidays are the obvious example, but also think about bank holidays, or ordering around payday when the next delivery might land on a Friday) it is worth reading up on travel storage before you go rather than working it out at the airport. The guidance on travelling with Wegovy covers cool bags, flight rules and what to declare at security.

Signs a pen may have been damaged by temperature

You cannot reliably tell by looking. The solution is not clearer, darker, thicker or obviously contaminated if semaglutide has degraded. What you can check: the pen should be clear and colourless or almost colourless. Particles, cloudiness, or discolouration are all reasons not to inject, return the pen and contact your prescriber. Beyond that, the time-and-temperature rule is your best guide.

The injection site itself is a separate concern. Each pen should be injected into the abdomen, thigh or upper arm, rotating sites each week. If you are new to self-injecting or want to revisit technique, using alcohol swabs to clean the site beforehand is a straightforward step that keeps things hygienic. The technique matters as much as the storage.

Side effects like nausea and fatigue are common after injection, particularly in the early weeks of treatment, and are unrelated to storage temperature. If you are finding the days after your injection harder than expected, the guide to fatigue after a Wegovy injection explains what is typical and what warrants a call to your prescriber.

How oral Wegovy changes the picture

The Wegovy tablet, approved by the MHRA in June 2026 as the UK's first licensed oral GLP-1 medicine for weight management, does not require refrigeration. It is stored at room temperature from the moment you receive it, making it the simpler option for people whose lifestyle involves frequent travel or who simply find cold-chain management stressful. The trade-off is a different daily routine: the tablet is taken first thing in the morning on an empty stomach, with a small sip of plain water, at least 30 minutes before any food or drink.

That distinction matters when people are choosing between the injection and the tablet. Storage logistics are one legitimate factor in that conversation, and it is worth raising with your prescriber. You can read more about how Wegovy works and which format might suit you before your consultation, or explore the wider range of licensed weight-loss treatments if you are still weighing up your options.

Whether the injection or the tablet is more appropriate for you clinically is a question only a prescriber can answer after reviewing your full picture. Cost is sometimes part of that conversation too; the Wegovy price guide sets out what private treatment typically costs in the UK.