Injecting Wegovy: what to decide before you pick up the pen

Choosing where to inject: what makes each site different

The three sites licensed for Wegovy injections each have practical trade-offs, and which one suits you may change week to week. The abdomen (a couple of inches away from the navel) tends to be the easiest to reach and see clearly, which is why many people start there. The outer thigh is straightforward when you are sitting down; a common question is whether it can be done through clothing, and the answer is no, always inject into clean, visible skin. For injecting Wegovy in the arm, you will usually need someone to help, because reaching the back of the upper arm solo is awkward and makes it harder to steady the pen properly.

Whatever site you choose, rotate the exact spot within it. Using the same patch every week causes the fatty tissue to thicken (a process called lipohypertrophy) which can change how well the medicine is absorbed. Think of the abdomen as a clock face and move around it; do the same with the thigh. If you notice any lumps, hardness or pitting, mention it at your next clinical check-in before injecting into that area again.

A more detailed look at the specific approach for each site is available on these pages: injecting Wegovy in the thigh, and upper arm technique. The NHS medicines information for semaglutide also covers injection site guidance at a patient level, see the NHS semaglutide page.

Preparing the pen: the steps that matter most

Take the pen out of the fridge (many people keep theirs on the door shelf, next to things they reach for daily, which doubles as a useful weekly reminder) and allow it to reach room temperature for a few minutes before injecting. A cold pen is more likely to sting. Do not shake or freeze it. Check the liquid through the viewing window: it should be clear and colourless to slightly yellow. Never use it if it looks cloudy, contains particles or has been frozen.

Clean the injection site with an alcohol swab and let the skin dry fully before you press the pen down; injecting through damp skin stings more. Remove the pen cap, place the pen flat against the skin and press the injection button firmly. You will hear or feel a click at the start of injection. Hold it in place until a second click signals the dose is complete, lifting too early means you may not receive the full dose. The pen then locks automatically and is ready for safe disposal.

Each Wegovy pen delivers a single weekly dose. After use it should go into a proper sharps container, never a household bin or a recycling box. The needle tip is covered by the pen's safety mechanism, but handling it as a sharps item is still good practice and is required under UK waste rules.

Missed doses and dose changes: when to ask rather than decide alone

The timing of injections matters. If you miss a dose and there are at least five days left before your next scheduled one, the NHS guidance is to inject it as soon as you remember and then return to your regular day. If fewer than five days remain, skip it and continue with your normal schedule, do not double up. These decisions should be confirmed with your prescriber or the Patient Information Leaflet rather than an online forum, because context matters: where you are in the titration schedule, whether you have been unwell and other factors all affect what makes sense for you personally.

Dose changes follow a stepwise titration schedule, 0.25mg rising through 0.5mg, 1.0mg, 1.7mg and up to 2.4mg, each step typically lasting around four weeks. Each increase is clinically reviewed; a prescriber should confirm the change is appropriate before you move up. For people wondering how Wegovy compares with other injectable options, this overview of weight-loss injections sets out how semaglutide and other treatments differ. If the pen itself does not appear to inject, there is specific guidance on what to check first.

Some people find it helps to watch the technique demonstrated before trying it themselves. A video guide to injecting Wegovy can clarify the finer points that are hard to convey in text alone, particularly the pen angle and how long to hold it in place.

Side effects at the injection site and what they usually mean

Redness, itching and a small raised area around the injection site are common, particularly in the first few weeks. They nearly always settle on their own. Rotating sites (and making sure the skin is dry before you inject) reduces how often they appear. Persistent bruising, swelling that spreads, or any sign of infection such as increasing warmth, redness and tenderness beyond the immediate site are reasons to contact your pharmacist or GP rather than wait.

The wider side-effect profile of Wegovy is predominantly gastrointestinal: nausea, loose stools, constipation and occasional vomiting are the most frequently reported. These are most noticeable in the first days after starting or after a dose increase, and for most people they ease within a week or two as the body adjusts. The NHS England weight management injections guidance includes a plain-language summary of when to seek help. One symptom that warrants prompt medical attention regardless of timing: severe, persistent abdominal pain that extends toward the back, with or without vomiting. That pattern can signal pancreatitis, which the MHRA highlighted in a January 2026 Drug Safety Update on GLP-1 medicines, report any suspected side effects at yellowcard.mhra.gov.uk.

For a broader picture of Wegovy (including eligibility, the wider titration path and cost context) the Wegovy treatment overview covers the full picture. If you have specific questions about pricing, the Wegovy cost guide explains what legitimate private treatment typically includes.

If you are considering starting Wegovy and want a clinical assessment, check your eligibility with our prescribers, consultations are free, and a GPhC-registered Independent Prescriber reads your answers the same day.