Do You Keep Wegovy in the Fridge? What the Guidance Actually Says

The storage decision you face before every injection

Most people ask this question for a practical reason: the fridge feels inconvenient, a trip is coming up, or a pen was accidentally left on the counter overnight. Whatever the reason, it is worth understanding the logic behind Wegovy's storage requirements rather than just memorising a rule, because knowing the why helps you make the right call when the situation does not fit neatly into the instructions.

Semaglutide, the active molecule in Wegovy, is a peptide, a protein-based compound that can degrade when exposed to heat, direct sunlight or freezing temperatures. Refrigeration at 2°C to 8°C keeps the medicine stable and effective for the full duration of its shelf life. The NHS medicines page for semaglutide confirms this requirement clearly, and the full technical detail sits in the Mounjaro and Wegovy SmPCs published on the Electronic Medicines Compendium. When in doubt, the Patient Information Leaflet that comes with your pen is your most reliable reference for exact storage windows, it is written specifically for the version of the product you have been dispensed.

One thing to settle immediately: the fridge is not optional before first use. It is a condition of the medicine's licensed stability. Pens that have been stored outside the correct temperature range before use should not be injected; contact your prescriber or pharmacist before proceeding.

After first use: do you still need to keep Wegovy in the fridge?

This is where the guidance becomes a little more nuanced. Once you have administered your first dose from a Wegovy pen, you have two options for where the pen lives until next week's injection, and the Patient Information Leaflet sets a specific time limit on the room-temperature option. The exact number of days is stated in that leaflet; this page does not repeat it, because the window can differ between product batches and pen formats, and copying the wrong figure here could lead to a mistake. Read the leaflet that came with your pen.

What the guidance consistently confirms is that room-temperature storage is permissible within that window, at temperatures below 30°C, away from direct heat and light. This matters for people who share a fridge with flatmates, keep a pen at work, or simply find it easier to keep the pen on a shelf where they will not forget their weekly injection. Any of those arrangements is fine, within the stated period.

If you are partway through a pen and unsure how long it has been out of the fridge, our page on how long you can keep Wegovy out of the fridge covers this in more detail, and our page on Wegovy storage after first use walks through the post-injection question step by step.

The freezer is not a safe fallback

A question our prescribers hear from time to time: can you freeze Wegovy to extend its life? The answer is no. A frozen pen must not be used. Freezing damages the molecular structure of semaglutide in ways that are not visible to the naked eye, the liquid may look normal, but the medicine may no longer be effective or safe. There is no way to reverse the damage by thawing the pen slowly.

If a pen has accidentally been placed next to the ice compartment and feels partially frozen, or if there is any doubt, the safe course is to dispose of it properly and speak to your prescriber. A sharps container is the correct way to dispose of used or compromised injection pens at home, standard household bins are not appropriate. Your prescriber or pharmacist can advise on replacement if a pen is wasted for storage reasons.

For people considering Wegovy or comparing it with other options, the storage difference between the weekly injection and the newer Wegovy overview formats is worth factoring in, particularly if you travel frequently. Our Wegovy price comparison page covers the cost picture for those weighing up private treatment options.

Travelling with Wegovy: a practical note

Storage becomes a real decision point when you are away from home. The room-temperature window exists partly for this reason, but it does not make Wegovy fridge-free for extended trips. A few things to plan for: pack your pen in your hand luggage (temperature in aircraft holds can fall well below zero), use an insulated travel pouch if the destination is warm, and check whether your accommodation has a fridge before you travel rather than hoping one will be available.

If you are flying, airport security may ask about the pen; carrying a copy of your prescription or the dispensing label helps. Our page on keeping Wegovy out of the fridge covers the travel context in more depth, and for anyone wondering whether semaglutide in other forms has different storage needs, our page on semaglutide and fridge storage addresses that directly.

Getting storage right is one of those unglamorous but genuinely important parts of treatment. If you have questions about your specific situation, the clinical team at nume provides 7-day aftercare, you can reach us through the contact page. And if you are still deciding whether Wegovy is the right route for you, check your eligibility through a free consultation with one of our GPhC-registered prescribers.