How to Take the Wegovy Injection Correctly

Choosing a site: where to inject Wegovy and why rotation matters

Your three options are the abdomen, the front of the thigh, and the back of the upper arm. The abdomen is most people's first choice because it is the easiest to reach and gives a reliable pinch of fatty tissue. Wherever you inject, stay at least five centimetres clear of the navel, any scar tissue, or areas of broken skin.

Rotation is not optional detail. Injecting the same spot week after week causes lipohypertrophy, fatty lumps under the skin that slow absorption and reduce how reliably the medicine works. A practical approach is to divide each site into a rough grid and move one square along each week, returning to the first after a full rotation. Some people keep a brief note in their phone. The NHS patient information for semaglutide covers correct technique in plain language and is worth reading alongside the Patient Information Leaflet that comes with your pen.

If you are self-injecting into the upper arm, an auto-injector pen makes it easier, ask your prescriber whether that format is available for your dose. For a full walkthrough of the process, the guide on how to use the Wegovy injection covers each step in detail, alongside the wider context of taking semaglutide injections, which the guide to taking semaglutide injections addresses more broadly.

Step-by-step: what happens on injection day

Start by checking the pen. The liquid should be clear to slightly yellow and free of particles; do not use it if it looks cloudy or contains specks. Refrigerated pens should be left to reach room temperature for around 30 minutes before use, cold medicine can sting more, and comfort matters when you are doing this every week.

Clean the injection site with an alcohol swab and let the skin dry fully before injecting; wet skin can cause stinging. Pinch a fold of skin, press the pen firmly against it, and activate the injection. Hold the pen in place until the injection is complete (your pen's leaflet will tell you how long) then withdraw it without rubbing the site. Rubbing can accelerate absorption unevenly and cause bruising.

Used pens contain a retracted needle and must never go in household waste or a recycling bin. A dedicated sharps container keeps disposal safe and is a legal requirement in most UK settings. For detail on what to do with the pen once it is finished, the guide on disposing of Wegovy pens safely answers the specific question. Choose your injection day thoughtfully, many people pick one that is easy to remember, midweek, so the next dose lands before the weekend rather than across it.

Timing, storage, and what to do if your day shifts

Once you have chosen an injection day, stick to it. If life moves things around (a family event, travel, an appointment) you can shift the dose by a day or two in either direction, as long as it stays at least four days from the next planned injection. Do not double up if you miss a day. If a full week passes without injecting, check the guidance in your Patient Information Leaflet and speak with your prescriber; the right answer depends on how far into the titration schedule you are.

Storage is straightforward but unforgiving. Keep Wegovy pens refrigerated between 2°C and 8°C. Once removed from the fridge, a pen can be kept at room temperature for a limited period, the exact window is stated in the SmPC on the Electronic Medicines Compendium, and that is the figure to follow rather than anything quoted secondhand. Never freeze a pen, and keep it away from heat and direct light. A question our prescribers hear regularly is whether pens survive a weekend away: the answer is yes, provided you know the room-temperature window and plan accordingly. The afternoon before you travel is a good moment to check.

If you are wondering how the weekly injection schedule compares to daily oral options, the full guide to taking Wegovy covers the broader treatment picture. For questions about timing your dose day around your routine, choosing when to take your Wegovy injection goes into more detail.

Side effects linked to technique, and when to seek help

Most side effects from Wegovy injections are gastrointestinal: nausea, loose stools, constipation, indigestion, and occasional vomiting. These tend to cluster in the first couple of weeks after starting or after a dose increase, and many people find they settle as the body adjusts. Poor technique (injecting too quickly, not holding the pen long enough, or repeatedly hitting the same site) can add injection-site reactions on top: redness, bruising, or small lumps.

Some symptoms need prompt attention. Severe, persistent stomach pain that spreads toward the back, with or without vomiting, is a warning sign for pancreatitis, a rare but serious reaction the MHRA flagged in a Drug Safety Update in January 2026. Stop injecting and seek urgent medical care if this happens. Signs of a serious allergic reaction (swelling of the face or throat, difficulty breathing, rapid heartbeat) also need emergency help.

You can report any suspected side effect to the MHRA directly through the Yellow Card scheme; this applies to Wegovy as it does to any medicine. If you have questions about your specific situation, our prescribers are available seven days a week for aftercare. For anyone still deciding between injection and tablet formats, a brief look at the weight-loss treatment options available through nume may help you compare.

Wegovy is a prescription-only medicine. Suitability, dose increases, and any changes to your schedule are decisions your prescriber makes with you, not adjustments to make alone. If you have not yet started a clinical assessment, you can speak to our prescribers through a free consultation today.