Wegovy at Room Temperature: What the Evidence Actually Says

Step 1, Keep your pen in the fridge until you need it

The default position is straightforward: Wegovy pens live in the refrigerator, kept between 2°C and 8°C. That means away from the freezer drawer, away from the back wall where things sometimes freeze, and ideally not right next to a heat source like a fridge-mounted light. The pen does not need to be in a special compartment; a shelf in the door is fine, so long as the fridge holds a stable temperature in that spot.

Freezing a pen is not recoverable. If a Wegovy pen has been frozen, it should not be used. The formulation is sensitive to ice-crystal formation in a way that is not visible to the naked eye, so there is no safe way to tell whether a frozen pen is still effective, the guidance is simply to discard it and contact your pharmacist or prescriber for advice on your next steps.

The full Wegovy storage temperature guidance covers the specific thresholds in more detail if you want to read further.

Step 2, Use the room-temperature allowance when you genuinely need it

Life does not always cooperate with cold-chain requirements. Weekends away, long train journeys, power cuts: there are legitimate reasons a Wegovy pen might be out of the fridge for a stretch. The good news is that the medicine is stable at room temperature for a defined period, but the exact duration is written in your Patient Information Leaflet, and that is deliberately where this page routes you, because the leaflet is the authoritative, up-to-date source. Citing a number here and having it diverge from your specific pen's batch instructions would cause more confusion than clarity.

What can be said plainly: room temperature in this context means a typical indoor environment, not a car parked in August sun, not a bag left on a radiator, not a garden table on a warm afternoon. If you want a fuller breakdown of whether semaglutide can be kept at room temperature and what conditions count, that page works through the detail.

One practical note from our prescribers: people often ask about this because they are travelling. A small insulated pouch (not a freezer block directly against the pen) is a sensible way to extend comfortable storage on the go without risking freezing.

Step 3, Warm the pen before injecting, not by heating it

This step catches people out more than almost any other. Many find that injecting a pen straight from the fridge is uncomfortable, the cold liquid can sting or cause a local reaction at the injection site. The answer is simple: let the pen sit at room temperature for around 30 minutes before you use it. No microwaves, no warm water, no body heat from a tight grip for longer than that.

If you want to understand the detail behind whether Wegovy needs to reach room temperature before injection, and what that actually changes about the experience, that page explains it clearly. Getting the injection technique right matters too, how to administer semaglutide injections is a practical guide worth reading if you are new to the pen or have just moved to a higher dose.

The NHS medicines information for tirzepatide and semaglutide both reinforce that storage instructions should be followed exactly as described in the Patient Information Leaflet, and any doubt about a pen's condition should be raised with the dispensing pharmacy before use. The NHS semaglutide page is a reliable starting point for patient-level guidance on how the medicine is supplied and stored.

Step 4 (Know when to discard and what to do next

A pen that has exceeded its room-temperature window should be placed in a sharps container and disposed of through your pharmacy's sharps return scheme) not in household waste, and not down a drain. Contact your prescriber or the dispensing pharmacy as soon as you can so that a replacement can be arranged. At nume, our prescribers and aftercare team are available seven days a week if you need to discuss what happened and what to do about your next dose.

It is worth knowing what a correctly stored pen looks like when it arrives: your Wegovy pen comes by tracked DPD delivery in plain, unbranded packaging, with no indication of what is inside. The pen itself is a pre-filled, single-dose injector. It should be transferred to the fridge as soon as you bring it indoors, within the hour if possible. If you are curious about where to buy Wegovy through a regulated UK pharmacy, that page sets out what to look for in a legitimate supplier and how to verify one on the GPhC register.

Semaglutide is a prescription-only medicine. If you are considering starting treatment or have questions about how it works, the Wegovy treatment overview covers the licence, the evidence and the clinical context. For a broader look at weight-loss treatment options available in the UK, including how they compare, that page is a good place to think through the decision before speaking to a prescriber.