The Wegovy Pen: What You Need to Know Before and After Each Injection

Wegovy (semaglutide) comes in a series of pre-filled pens, each designed for a single once-weekly injection. The dose strengths commonly referenced in the prescribing information are 0.25 mg, 0.5 mg, 1 mg, 1.7 mg, and 2.4 mg — your prescriber decides which strength is right for you at any given stage of your treatment.

Does the Wegovy pen need priming?

Unlike some injectable devices, the Wegovy pen does not require priming before use. Each pen is ready to use as supplied. Always read the patient information leaflet that comes with your specific pen, as it contains the step-by-step instructions for your exact device — those instructions take precedence over any general guidance you read online.

What does an empty Wegovy pen look like?

After the dose has been delivered, the plunger inside the pen will have moved fully, and the pen should not be reused. Check the viewing window on your pen if one is present — your leaflet will describe what a fully delivered dose looks like for your specific device. If you are unsure whether the full dose was delivered, contact your prescriber or doctor rather than attempting a second injection.

Injection sites

Wegovy is injected subcutaneously — into the fatty tissue just under the skin. Commonly used sites include the abdomen, the front of the thigh, and the upper arm. Rotating between sites each week is generally recommended to avoid skin changes at any one spot. For more detail on the injection process and site choices, the Wegovy overview covers the broader picture of what to expect on semaglutide, and if you are curious how the Mounjaro pen compares in design and use, see our guide to the Mounjaro pen.

Storing your pen

Storage requirements vary slightly by pen type and whether the pen has been used yet — always check the leaflet or the electronic Medicines Compendium (eMC) entry for your specific product. As a general rule, unused pens are typically refrigerated, while a pen in current use may be kept at room temperature for a limited period described in the leaflet. Never freeze a pen.

If you want to explore a related topic in more detail, the next Wegovy pen guide covers additional practical questions people commonly have once they are a few weeks into treatment.

Keeping a record of each weekly injection — the date, dose strength, and which site you used — turns an easy-to-forget routine into a clear, reliable log. GLP Trackr's injection-site tracking and rotation feature lets you record the site after each shot, and the app then suggests where to inject next time, so rotation becomes automatic rather than something you have to remember on the day.

Alongside site tracking, the dose logging feature stores the strength and timing of every injection in one place. That history is genuinely useful to bring to an appointment: instead of trying to recall whether last Tuesday's pen was 1 mg or 1.7 mg, you have a precise record ready to share. The app's doctor report can turn that log into a clear summary for your prescriber.

For the wider context of managing your GLP-1 journey — from understanding how semaglutide works to tracking your progress over time — the GLP-1 medication hub is a good place to start.

If you notice anything unexpected around injection time — a site reaction, unusual discomfort, or anything that concerns you — log it and raise it with your prescriber or doctor. GLP Trackr is a tracking tool; it is not a substitute for clinical advice, and any decision about your dose or injection schedule belongs with the healthcare professional who prescribed your medication.

Ready to bring some structure to your weekly injection routine? Download GLP Trackr on the App Store or Google Play and explore it free for 7 days — no commitment, just a clearer picture of your journey from the very first shot.