How to Store a Semaglutide Injection Correctly

Step 1, Fridge, not freezer: where the pen lives before you open it

An unopened Wegovy pen belongs in the refrigerator, standing upright if possible, at a steady 2–8°C. That rules out the freezer shelf and the back of the fridge, where the cooling element can push temperatures below zero overnight. Freezing degrades semaglutide; a pen that has frozen solid or partially frozen should not be used, even once thawed.

The vegetable drawer or a dedicated medicine shelf near the middle of the fridge is usually the safest spot. Keep the pen in its original carton: this protects against light exposure and makes it straightforward to check the expiry date printed on the outer packaging. For further detail on how long an unopened pen can realistically be stored, the semaglutide storage duration guide answers that question directly.

One practical detail worth knowing: if you collect your pen first thing in the morning and want to put it in the fridge before the school run, it will be absolutely fine. The pen tolerates brief handling time between the pharmacy bag and your fridge door.

Step 2 (Understanding the room-temperature window once the pen is in use

Once you have used a pen for the first time, it does not need to go straight back in the fridge between doses) but it cannot live on the kitchen counter indefinitely either. The manufacturer specifies a maximum number of days at room temperature (defined as up to 30°C) after first use. That figure is printed in the Patient Information Leaflet that came with your pen. Consult that leaflet rather than a generic internet figure, because pack formats and formulations can vary.

Keep the pen away from direct sunlight, radiators, car dashboards and windowsills. A cool, dark cupboard or a bedside drawer is usually suitable during the permitted window. If you are ever unsure whether a pen has exceeded its room-temperature limit, contact your prescriber or pharmacist before injecting. The full semaglutide storage guide goes into further detail on what to do in edge cases like power cuts or travel.

The NHS medicines page for semaglutide also summarises key storage points in plain language and is worth bookmarking alongside your leaflet.

Step 3, Inspection before every injection

Before each dose, hold the pen up to the light and look at the liquid. Wegovy solution should be clear and colourless to slightly yellow, free of particles and cloudiness. If you see floating matter, discolouration or the solution looks milky, do not inject. Use a fresh pen and contact your pharmacy or prescriber.

Also check the expiry date on the label every time, not just when you first open the box. A pen sitting in your fridge does not announce when it has expired. Two seconds of checking prevents a wasted injection or, worse, an ineffective dose at a critical point in your treatment programme.

For step-by-step technique (where to inject, how to rotate sites and what to do if you miss a dose) the guide to injecting semaglutide covers the process from cap to click. If you want to understand the broader picture of subcutaneous injection practice, that page is useful reading before your first pen.

Step 4, Safe disposal of needles and used pens

Needles should be removed from the pen immediately after each injection and placed in an approved sharps container. Never recap a used needle and leave it attached to the pen between doses: needle-stick injuries are a real risk, and a recapped needle is not a safe one. A 1-litre sharps container is available from our pharmacy if you need one.

Once a pen is finished, it goes into the sharps container too. Your local council or GP surgery can advise on collection points for sealed sharps containers, most areas offer a free household sharps collection service. Do not put used pens in the general household bin.

If you have concerns about side effects, missed doses or any aspect of your current treatment, the semaglutide injections overview may help, and you can always contact our clinical team directly. Any suspected side effects should be reported using the MHRA's Yellow Card scheme, which is open to patients as well as healthcare professionals. For a broader look at weight-loss injection options, this overview of injectable treatments is a useful starting point.

If you are considering starting treatment and want to understand how semaglutide compares to other options, our prescribers are available to talk you through the clinical picture. Speak to our prescribers through a free consultation to find out whether Wegovy is clinically appropriate for you.