Bubbles in Your Wegovy Pen: Should You Be Concerned?

Small air bubbles in a pre-filled injectable pen are a well-recognised feature of this type of device. They can appear for several reasons:

• Normal manufacture: Tiny bubbles may be present in the pen from the time it leaves the factory. This is expected and noted in product information.
• Temperature changes: Moving the pen between cold storage and room temperature before use can cause air to expand slightly, making any bubbles more visible.
• Handling and movement: Carrying or shaking the pen can introduce or redistribute air within the cartridge.

Unlike older-style syringes where air bubbles in an injectable dose required careful removal, modern pre-filled auto-injector pens like those used for Wegovy are designed to deliver the correct dose even when small bubbles are present. You should not attempt to remove bubbles by tapping or manipulating the pen in ways not described in the patient information leaflet that came with your pen.

If you are ever unsure whether what you are seeing is a normal bubble or something more concerning — such as discolouration, cloudiness, or visible particles in the solution — always refer to your patient information leaflet and contact your pharmacist or prescriber before using the pen. The solution in a Wegovy pen should normally appear clear and colourless.

For more detail on handling your device correctly, take a look at our guide to using your Wegovy pen and our overview of air bubbles in the Wegovy pen for a closer look at this specific topic.

One practical way to stay on top of your weekly injection routine is to log each dose as soon as you have administered it. GLP Trackr's dose and injection logging feature lets you record the date, time, and dose strength of every shot, so you always have a clear picture of where you are in your schedule — no second-guessing whether you have taken this week's dose.

If you ever notice something unusual about your pen — bubbles that look different from normal, an unexpected change in the solution, or any concern about a particular injection — logging a note in the app means you have a record ready to share with your prescriber or pharmacist at your next appointment. The Wegovy pen guidance section of our resource library has further information on what to check before each use.

GLP Trackr also tracks injection site rotation, suggesting which site to use next based on your logged history — helping you keep to the rotation pattern your prescriber has recommended.

If you have any doubt about whether your pen is safe to use, always follow the guidance of your prescriber, pharmacist, or the patient information leaflet supplied with your medication. Do not use a pen that appears damaged, leaking, or where the solution looks abnormal — contact your healthcare professional promptly in that situation.

You can find more support and resources in our GLP-1 medication hub.

Ready to keep a clear record of every injection? GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and start logging your Wegovy journey today.