Your Wegovy Got Warm: Here's How to Decide What to Do Next

How long was it warm, and how warm did it actually get?

This is the decision that matters most. The Wegovy patient information leaflet sets a specific room-temperature window (both a maximum temperature and a maximum number of days) outside which the pen should not be used. Because that window is stated precisely in the leaflet and can change between product batches or formulations, the right source is the leaflet that arrived with your pen, not a forum post or a remembered figure from somewhere else.

What we can say clearly: a pen left on a warm windowsill in July for three days is a different situation from one that spent two hours in a delivery van before you picked it up. The former almost certainly exceeds the permitted window. The latter very probably does not. The gap between those extremes is where the leaflet's numbers do the work.

If you lost the leaflet, the Wegovy summary of product characteristics is published on the electronic Medicines Compendium (eMC), which gives the same storage and handling information in the prescribing reference. You can also call your dispensing pharmacy, that is exactly the kind of question a pharmacist is there for. Our contact page lists how to reach the nume clinical team if you got your pen through us.

One practical note: do not re-refrigerate a pen that has already warmed up and been out of the fridge for any meaningful period, as if it has exceeded its allowable time at room temperature, cooling it again does not restore the medicine.

What does the liquid in the pen actually look like?

Even if you are confident the pen has been within its temperature window, a quick visual check before every injection is standard good practice. Wegovy solution should be clear and colourless or very pale yellow. Put the pen up to a light source and look through the cartridge area.

Do not inject the pen if the liquid looks cloudy, discoloured, or if you can see visible particles. These are signs that the medicine may have degraded, potentially from heat, from freezing, from physical damage, or from a manufacturing issue. None of those can be recovered by waiting.

A pen that has been frozen is also compromised. If your delivery arrived in an ice pack and the pen was in direct contact with ice blocks rather than a cool-gel sleeve, there is a chance it froze. Frozen-then-thawed semaglutide can appear fine visually but still be degraded, another reason to check the leaflet's storage requirements carefully and, when in doubt, ask.

For practical detail on what to look for the moment your Wegovy arrives, the guide on what to do when Wegovy arrives warm covers the arrival and inspection steps specifically.

Is this a delivery problem or a storage problem at home?

Knowing the source of the temperature excursion matters because it affects what you do next. If the pen got warm in transit, the responsibility for replacing it sits with the pharmacy and, ultimately, the courier. At nume, pens are dispatched in temperature-controlled packaging (DPD tracked delivery, plain unbranded box) and we review each case where a customer contacts us about a warm pen on arrival.

If the pen got warm because of something at home (fridge door left open, power cut, pen left on the bathroom shelf by accident) that is a different situation. The medicine itself is not defective; the storage conditions were not maintained after delivery. In either case, the action is the same: do not inject a pen you are genuinely uncertain about, and get advice before you do.

There is more on the science of what actually happens to semaglutide outside its cold chain in the full explainer on what happens if Wegovy gets warm, and on whether brief warming at room temperature before injection affects comfort or efficacy in the guide to letting Wegovy warm up before injecting.

The NHS medicines page for semaglutide also covers storage as part of general Wegovy guidance, and is a good cross-reference alongside your patient information leaflet. Suspected quality problems with any medicine can be reported via the MHRA Yellow Card scheme, relevant both for storage failures and for anything that looks unusual about the pen on inspection.

When to get medical help rather than just pharmacy advice

Most warm-pen queries resolve straightforwardly: the pen was in the window, it looks fine, you use it. A smaller number resolve the other way: the pen was clearly too warm for too long, you do not use it and arrange a replacement. Both are manageable.

The situation that needs more than pharmacy advice is if you injected from a pen that you later realised may have been compromised, and you then develop symptoms that concern you. GLP-1 medicines like semaglutide are well tolerated by most people, but if you experience severe stomach pain, signs of an allergic reaction, or anything that feels medically urgent after an injection, contact NHS 111 or your GP rather than waiting for a pharmacy call-back.

Side-effect queries that are not urgent, such as nausea, digestive discomfort, or injection-site reactions on the arm, as well as questions about technique when injecting into the back of the arm, are handled by our aftercare team seven days a week. You can reach us through the FAQs page for common questions, or directly via the contact page if your situation is specific. If you are considering Wegovy and want to understand what the treatment actually involves before starting, the Wegovy overview covers the full picture, and a free consultation through our treatment page is the right next step when you are ready.