Do you need needles for Wegovy, or does the pen come ready to use?

You open the box and there it is, no assembly required

Picture the moment the DPD delivery arrives: a plain, unbranded box, nothing on the outside to tell a neighbour what it contains. Inside are your Wegovy pens, an information leaflet, and a reminder that they need to go straight into the fridge. The pen itself is a smooth, pre-filled autoinjector. Pick it up and you will notice a cap at one end, that is the needle guard. The needle is already inside, integrated into the device. There is no syringe to draw up, no separate needle to click on. Novo Nordisk designed the pen this way specifically to lower the barrier for people who have never self-injected before.

What you will do before each injection is remove the pen cap, check the solution is clear, press the pen gently against the skin of your chosen site (abdomen, thigh or upper arm), and press the button. The mechanism drives the fine needle in and delivers the dose automatically. Most people report feeling very little, the needle is short and the mechanism is quick. The full Wegovy treatment overview covers what to expect across the titration schedule.

One practical note: the pen must be at room temperature before you inject. Taking it out of the fridge 30 minutes beforehand is standard practice, though the Patient Information Leaflet sets out the exact storage and warming window, always follow that rather than guessing.

The needle inside the pen: what size it actually is

The integrated needle on the Wegovy pen is designed for subcutaneous injection, meaning it goes just below the skin into the fatty layer rather than into muscle. That calls for a short, fine gauge needle, and that is what you get. The pen's needle is typically in the 4–5 mm range, finer and shorter than a blood-test needle, closer in feel to a lancet for a blood-glucose check. If you want to understand exactly what that looks like before your first injection, the page explaining the Wegovy needle covers what the dimensions mean in practice and what you can expect from the integrated design.

Because the needle is fixed inside the pen, there is no choice to be made about gauge or length, unlike insulin pens, where some people swap in different needle lengths, and our guide to Wegovy needles explains how that fixed design compares to adjustable alternatives. The needle guard also means you never need to look directly at the needle if that would help with confidence; you can simply position the pen and press.

Rotating your injection site each week is important to avoid irritation or skin changes at any one spot. The abdomen (at least a couple of centimetres from the navel), the front of the thigh, and the outer upper arm all work. Keeping a rough mental note of where you injected last time is enough for most people. If you notice any skin reaction, the advice on bleeding or irritation at the injection site is worth reading.

Sharps disposal and what happens after you press the button

Once the dose is delivered, the pen's needle mechanism locks. You cannot reuse a Wegovy pen, each one is designed for a single weekly injection and that is final. The used pen then needs to go into an approved sharps container; it cannot go in a recycling bin or general household waste because the needle inside is a clinical sharp. A 1-litre sharps container fits the standard weekly pen and is what most people use at home. Your local council or GP surgery can usually tell you about the nearest sharps collection point, or your pharmacy may accept them.

Before injecting, cleaning the skin with an alcohol swab is good practice, it reduces the risk of infection at the site. The semaglutide injection technique guide has more detail on site preparation if you want a step-by-step walkthrough.

The whole process, from taking the pen out of the fridge to disposing of it, takes under two minutes once you are comfortable with it. Most people find that within two or three weeks it feels entirely routine. A question our prescribers hear most weeks is whether people will cope with self-injecting, and the consistent answer is yes, once they have done it the first time.

If you are considering Wegovy and wondering about the practicalities of cost

The pen design matters when you are weighing up starting treatment, but so does what the treatment actually costs. The Wegovy pricing guide sets out what private treatment involves in the UK, including what a legitimate price should cover, consultation, prescription, clinical review, and delivery. For a prescription medicine, the lowest price you can find is not the measure that keeps you safe; the supply chain and the clinical oversight behind it are. At nume, one transparent price includes the free consultation, the prescription, and tracked next-working-day delivery once your prescriber has approved treatment.

Wegovy is a prescription-only medicine under UK law, and a prescriber decides whether it is appropriate for each individual. The weight-loss treatment overview explains the eligibility criteria and how the process works. If you have questions before starting, the FAQs cover the most common ones.