What temperature does semaglutide need to be stored at?

The refrigerator rule: what the 2–8°C range actually means in practice

Two to eight degrees Celsius is the standard pharmaceutical cold-chain range, and it is not arbitrary. It keeps the semaglutide protein stable without pushing it towards the one temperature that causes irreversible harm: freezing. A fridge running at 1°C, or a pen pushed to the back near the cooling plate, can freeze the solution. Frozen semaglutide cannot be thawed and used safely. The same goes for a fridge that has drifted above 8°C, perhaps because the door seal is worn or because it is a warm summer and the appliance is old.

The practical test: if you are not sure your fridge is in range, a cheap thermometer placed on the shelf where you store the pen will confirm it within a few hours. Store the pen towards the middle of a shelf, not in the fridge door, where temperatures vary most with each opening.

When the pen you ordered arrives, it comes in plain, unbranded packaging via DPD (tracked to your door) and the pen itself should go into the fridge as soon as you collect it. If you want a full breakdown of the figures and conditions involved, our guide on what temperature Wegovy should be stored at covers everything from fridge settings to what happens if things go wrong, and our dedicated page on the temperature to store Wegovy gives you a practical reference you can return to whenever you need a quick check.

The NHS medicines page for semaglutide confirms that pens should be kept refrigerated and protected from freezing, and directs patients to the patient leaflet for the full storage schedule, which is exactly where the most reliable, up-to-date figures live.

The room-temperature window: a practical allowance, not a free pass

Life is not always refrigerator-shaped. You might need to carry a pen to a friend's house, or you may be away from home on the day of your weekly injection. For this reason, the Wegovy pen can be stored at room temperature (up to 30°C) for a defined period after being removed from the fridge. The exact number of days permitted is specified in the Patient Information Leaflet that comes with your pen. Read it once and keep it.

Two things matter here. First, the room-temperature allowance is cumulative: each hour outside the fridge counts, even if the pen goes back in afterwards. Second, 30°C is a genuine ceiling, not a soft guideline. A car dashboard in summer, a windowsill in direct light, a bathroom cabinet near a radiator, all of these can take the temperature well past 30°C without feeling obviously hot to the touch.

If you are planning to travel, whether semaglutide can be kept at room temperature for your specific trip length is worth checking in detail before you leave. Your prescriber or pharmacist can help you think through the logistics. Crossing time zones, going through airport security with an insulated cool bag, and storing pens in hotel mini-fridges all have their own practical wrinkles.

One thing to do before every injection: let the pen sit at room temperature for a short while if it has come straight from the fridge. Cold liquid can sting more on injection, and allowing the pen to warm slightly can make the experience more comfortable. There is a separate but related question about whether Wegovy needs to reach room temperature before injecting, and the short answer is: it does not have to, but many people find it helps.

What to do if you are not sure a pen is still safe to use

This is the decision that matters most, and it deserves a direct answer. If a pen has been left out of the fridge for longer than the leaflet allows, or if it has been in conditions you cannot verify (a bag that got very warm, a fridge that broke down overnight), contact your pharmacist or prescriber before using it. Do not inject a pen if the solution looks cloudy, discoloured, or contains visible particles, it should be clear and colourless to slightly yellow.

The cost of a wasted pen is frustrating. The risk of injecting damaged medicine is not worth taking. This is not about being overcautious; it is about the fact that semaglutide is a biological medicine where structural integrity matters.

It is also worth noting that semaglutide is not the same as Ozempic, which is also a semaglutide injection but licensed for type 2 diabetes rather than weight management. Storage conditions for the two products share similarities, but the licensed indications and the prescribing context are different. If you are on Wegovy for weight management, always refer to the Wegovy-specific leaflet.

For a broader view of how Wegovy works and what to expect from treatment, the Wegovy treatment page covers the full picture. And if you have questions about your individual circumstances, our prescribers are available seven days a week. Speak to our prescribers through a free consultation and get a clinical view on your storage query or anything else about your treatment.