How to Prime a Wegovy Pen

Priming is a brief preparation step carried out before a new pen's first use — or any time you suspect the pen may not be working correctly. The goal is simply to ensure the needle is not blocked and that the medicine will flow when you inject.

The general process

While the precise steps are set out in the patient information leaflet that came with your pen (always follow that as the definitive guide), the process for pre-filled injectable pens like Wegovy generally involves:

• Attaching a new needle securely to the pen
• Selecting the priming step as described in your leaflet — typically a small test dose is expelled into the air, not into your body
• Checking that a drop of liquid appears at the needle tip, confirming the pen is ready

If no drop appears after the first attempt, the leaflet will tell you how many times to try before seeking advice from your prescriber or pharmacist. Never use a pen you are unsure about without checking first.

When priming applies

For Wegovy's pre-filled, single-use pens, the priming requirements vary by device generation — some newer pen formats are designed to be ready to use without a traditional priming step. Your leaflet will confirm whether your specific pen needs priming and, if so, exactly how. If you are unsure which version of the pen you have, the Wegovy pen guide on GLP Trackr covers the device in more detail, and information on each pen variant is available on the updated Wegovy pen format page.

If something looks wrong

If the liquid appears discoloured, cloudy (when it should be clear), or contains visible particles, do not use that pen. Contact your pharmacist or prescriber for a replacement. The same applies if the pen has been dropped or damaged. Your prescriber or doctor is the right person to advise you on any pen concerns — never attempt to adjust or repair a pen yourself.

For context on how priming compares across GLP-1 pens, see the guide on priming a Mounjaro pen.

Once your pen is primed and your injection is done, logging it straight away means you will always know exactly when your last dose was — useful for keeping your weekly schedule consistent and for any conversation with your prescriber.

GLP Trackr's dose and injection logging lets you record the date, time, and dose strength of each injection in seconds. The app also tracks which site you used — abdomen, thigh, or upper arm — and suggests your next rotation, so you are not relying on memory to avoid repeating the same spot. For a weekly injection, that small habit compounds quickly.

If you ever experience anything unexpected around injection time — a reaction at the site, or anything else you want to flag — the side-effect tracker lets you log it with a timestamp, building a clear record you can bring to your next prescriber appointment rather than trying to recall details weeks later.

Always follow the guidance in your patient information leaflet and from your prescriber or doctor — if anything about your pen or injection feels wrong, contact them promptly rather than proceeding. GLP Trackr is a tracking tool to support your journey, not a substitute for that clinical guidance.

You can also explore the broader GLP-1 medication tracking hub for more on managing your treatment week to week.

Ready to log every dose and keep your injection routine on track? Download GLP Trackr on the App Store or Google Play — your first 7 days are completely free.