How to inject semaglutide: video guide and step-by-step technique

What does a semaglutide injection video actually show you?

Video guides for semaglutide injection strip away the anxiety of the unknown. Watching a real pen being used (cap removed, skin pinched, click heard) is more reassuring than any written description. Our detailed step-by-step Wegovy pen video guide covers the full sequence from storage to safe disposal.

What you'll typically see: remove the pen cap, check the liquid is clear and colourless, select your site, clean the area, pinch the skin lightly, press the pen flat against the skin, press the injection button and hold for a full ten seconds, then release. The ten-second hold is the step people most often cut short, it ensures the full dose is delivered. A click confirms the injection has started; a second click (or a colour change in the dose window, depending on the pen format) confirms it is complete.

The NHS patient information for semaglutide recommends reading the full instructions in the Patient Information Leaflet before first use, and repeating the video each time you move to a new dose strength. Guidance on the full written technique is also covered in our written semaglutide injection guide, if you prefer that alongside the video.

Does the injection site change anything about how semaglutide works?

All three licensed sites (abdomen, thigh, upper arm) produce equivalent absorption of semaglutide according to clinical data; the choice is mainly about comfort and access. The abdomen is most commonly chosen because it is easy to reach and gives a consistent pinch. The thigh works well when the abdomen is sore or has been used repeatedly. The outer upper arm is the least common choice for self-injection simply because it is harder to stabilise the pen alone; a partner or carer can help if needed.

Rotating sites matters more than which site you choose. Using the same small patch repeatedly can cause lipohypertrophy, a fatty lump under the skin that alters absorption. Divide each site into zones and move around them. Our Wegovy video on how to use your pen illustrates site rotation clearly.

Avoid injecting into skin that is bruised, scarred, or irritated. Never inject into a vein or muscle, subcutaneous means the fatty layer just beneath the skin, not deep tissue. A short pinch of skin before pressing the pen keeps the needle in the right layer. If you see blood after removing the pen, press gently with a clean piece of gauze; it is not a cause for concern and does not mean the dose was lost.

What should you do if you miss a dose or the injection goes wrong?

Life happens. A missed or uncertain dose is one of the most common questions our prescribers field. The rule (confirmed in the Wegovy Patient Information Leaflet and supported by NHS guidance on semaglutide) is that if you are within five days of your missed dose, inject as soon as you remember and continue on your usual weekly day. If more than five days have passed, skip it and resume your normal schedule. Never take two doses in one week to compensate.

If you are unsure whether a dose was fully delivered (the pen did not click, the dose window looks unclear) treat the dose as missed rather than re-injecting. Re-dosing the same week risks receiving a double dose and intensifying side effects. Contact your prescriber or our aftercare team if you are uncertain. The video on how to take Wegovy also covers what a successful injection looks and feels like, which helps you judge for yourself.

Pens should be disposed of in a sealed sharps container after use, never in household recycling or general waste. Your local pharmacy can often accept filled sharps containers for safe disposal.

What are the most common injection-site side effects, and when should you act?

Redness, mild bruising, and a small lump at the injection site are the most frequently reported local reactions with semaglutide pens. They are typically brief and settle within a day or two. Rotating sites, as described above, reduces their frequency considerably.

Systemic side effects in the early weeks are usually gastrointestinal: nausea is the most common, followed by changes to bowel habit, and occasional reflux or fatigue. These tend to peak in the first few days after each new dose level and ease as your body adjusts. Staying hydrated and eating smaller, lower-fat meals around injection day helps many people.

Get medical help promptly for severe or persistent stomach pain that radiates to the back, with or without vomiting, this may indicate pancreatitis, which the MHRA flagged in its January 2026 Drug Safety Update as a known but uncommon serious risk with GLP-1 medicines. Signs of a serious allergic reaction (swelling of the face, lips, or throat, difficulty breathing) also require emergency attention. For a full picture of what the treatment involves, the Wegovy overview page covers the clinical profile in detail, and you can read about how Wegovy compares with other slimming injections if you are still weighing your options.

If you are considering starting treatment or have questions about the injection process before you commit, speak to our prescribers via a free consultation, a real clinician reviews your answers the same day, and the process takes only a few minutes to begin.