How to give Wegovy: making the decision to self-inject simple

Choosing where on your body to inject

The three licensed sites for Wegovy are the fatty layer of the abdomen (belly), the front of the thigh, or the outer upper arm. All three are subcutaneous sites, meaning the needle reaches just beneath the skin, not into muscle.

The abdomen is where most people start. Pinch an inch of skin a couple of inches away from your navel, hold the pen at a 90-degree angle against the skin, and press. The outer thigh works well if you prefer to be seated and can see the site easily. The upper arm is an option too, though some people find it harder to reach without help.

Rotating between these sites week to week is the key practical habit to build early. Using the same spot repeatedly can cause a build-up of fatty tissue under the skin that changes how the medicine absorbs. Many people divide each site into a rough grid and work through sections systematically. The detailed injection walkthrough on this site maps that rotation approach clearly if you want a visual framework.

Avoid injecting into skin that is bruised, irritated, or broken. If you have concerns about a reaction at an injection site, speak to your prescriber before the next dose.

The moment of injection: what the pen actually does

When your treatment arrives, it comes in plain, unbranded packaging via DPD, you can track it to your door. Inside, the Wegovy pre-filled pen is ready to use after it has been brought to room temperature for 30 minutes. There is no assembly, no manual needle attachment, and no dose to select. The pen is pre-set.

Remove the cap. Check the liquid is clear and colourless through the window. Press the pen flat against the cleaned injection site and push the button firmly. Hold it there. You will hear a click when the injection begins and a second click when it is complete. Keep the pen in place for around six seconds after that second click, this ensures the full dose has been delivered and reduces the chance of a small drop appearing at the skin surface.

Lift the pen straight out. The needle retracts automatically into the pen body. Dispose of the used pen in a semaglutide treatment context note: Wegovy is a semaglutide medicine, and the pen must go into a sharps container, not household waste. Your pharmacy or GP surgery can advise on local sharps disposal arrangements.

The NHS semaglutide medicines page includes guidance on storage and general administration that is worth reading alongside your leaflet.

Side effects that are linked to injection technique, and those that are not

Some people experience mild redness, swelling, or itching where the pen was pressed. These local reactions are almost always linked to technique: pressing too hard, using a cold pen straight from the fridge, or returning to the same site too often. Warming the pen to room temperature and rotating sites resolves most of them.

Separate from injection-site reactions, the most commonly reported effects with Wegovy are gastrointestinal: nausea, loose stools, constipation, and burping. These tend to be most noticeable in the first few weeks of a new dose and ease as the body adjusts. They are not technique-related, they reflect how the medicine works on gut hormone receptors. Wind and bloating is a question our prescribers hear regularly; there is a separate page on it if that particular side effect is weighing on your mind.

Less common but more serious symptoms include severe or persistent stomach pain that radiates toward the back. The MHRA has highlighted acute pancreatitis as an infrequent but potentially serious effect associated with GLP-1 medicines, if this kind of pain develops, stop the injection and seek medical attention promptly rather than waiting for your next prescription review. Suspected side effects can be reported via the MHRA Yellow Card scheme, and the information genuinely helps post-market safety monitoring.

When to ask a prescriber before giving the next dose

The decision of where Wegovy fits into your life (the right dose, the timing, what to do if you vomit shortly after injecting) belongs with your prescribing clinician, not a search result. A few practical triggers warrant a conversation before you give the next pen: you are due surgery and the anaesthetist needs to know your medicine list; you have started a new oral contraceptive and want to understand the absorption timing guidance; or you have experienced something unexpected since the last dose.

Thinking about giving blood while on Wegovy or what a fever might mean during treatment are specific situations with specific answers, we have covered those separately. For anything that does not fit a pre-written page, reaching the team is the most direct route. If you are not yet on treatment and are weighing up your options, the weight-loss treatment overview explains how Wegovy sits alongside other licensed choices, and a look at Wegovy pricing in the UK gives honest context on what private treatment actually costs.

If you are ready to find out whether Wegovy is clinically suitable for you, speak to our prescribers through a free consultation, reviewed the same working day by a real clinician, not a queue for automated software.