The Wegovy pen is designed to make weekly dosing simple and consistent. Here’s what the pen involves and what to expect the first time you use it.
Wegovy is delivered using a pre-filled injector pen, designed to make weekly dosing straightforward without needing to draw up medication yourself. Here’s what the pen involves and what to expect when using it.
What is Wegovy?
Wegovy is the brand name for semaglutide, a GLP-1 receptor agonist licensed for chronic weight management in adults, used alongside a reduced-calorie diet and increased physical activity. It works by mimicking a naturally occurring gut hormone that helps regulate appetite and satiety, which over time leads to reduced calorie intake and gradual weight loss.
The Wegovy pen
Each Wegovy pen is pre-filled and single-use, containing one dose of semaglutide at the concentration set out on your prescription. The pen is designed to be simple to operate: it’s placed against the skin and activated to deliver the injection, without needing a separate needle-attachment step for most versions. Once used, the pen is disposed of in a sharps container — never in household waste.
Getting started
Wegovy is prescription-only, so a clinician will confirm suitability and set your dosing schedule before you begin. Dosing starts at a low amount and increases gradually — typically every 4 weeks — up to a maintenance dose of 1.7mg or 2.4mg weekly, depending on tolerability and response. It’s injected once a week, on the same day each week, into the abdomen, thigh, or upper arm, with injection sites rotated to reduce irritation.
Storage
Unopened pens are typically stored in a refrigerator and protected from light. Once in use, a pen can usually be kept at room temperature for a limited period, set out in the patient information leaflet supplied with your medication. Wegovy pens should never be frozen.
Common side effects
As with other GLP-1 medicines, the most frequently reported side effects are gastrointestinal — nausea, diarrhoea, constipation, and vomiting — particularly during the early weeks of treatment or after a dose increase. Mild injection-site reactions such as redness or itching are also possible. Most side effects ease as the body adjusts; severe or persistent symptoms should be reported to your prescriber promptly.
Getting the most from treatment
Wegovy is intended to be used alongside a structured plan — a reduced-calorie diet, regular physical activity, and, where helpful, behavioural support. Regular follow-up with your prescriber allows your dose and progress to be reviewed and adjusted as needed.
Frequently Asked Questions
What if I miss a weekly dose?
If it’s within 5 days of your missed dose, you can usually take it as soon as you remember. If more than 5 days have passed, the missed dose is typically skipped and the next one taken on your regular scheduled day. Always check the patient information leaflet or ask your prescriber if you’re unsure.
Can I reuse a Wegovy pen?
No — each pen is single-use and should be disposed of safely in a sharps container after one injection, even if it appears to contain leftover solution.
Where should I inject?
The abdomen, thigh, and upper arm are the usual injection sites. Rotating between sites and even within the same area each week helps reduce skin irritation.
Considering Wegovy? Check your eligibility or start your free assessment to get started.
Wegovy pen: storage and travel tips
Keep your Wegovy pen refrigerated until first use; once opened, most Wegovy pen devices can be kept at room temperature for a limited period — check your specific pack insert for exact timing. When travelling, an insulated bag is a simple way to keep your Wegovy pen at a safe temperature without needing constant refrigeration. Never freeze a Wegovy pen, and avoid direct sunlight or very hot environments, such as a car glovebox in summer, since heat can affect the medication inside.