The best area to inject semaglutide — and how to rotate sites correctly

Step 1, Pick your site for this week's injection

Your three options are the abdomen (belly), the front of the thigh, or the outer upper arm. The abdomen is the site most people start with: there is usually enough pinchable tissue, it is easy to see what you are doing, and you can inject comfortably by yourself. The front of the thigh is a solid alternative, again, straightforward to self-inject without help. The outer upper arm is the third option, though injecting there yourself takes a bit of practice; many people use this site when a partner or carer can assist.

Within the abdomen, stay at least 5 cm (about two fingers' width) away from the navel. The NHS medicines information for semaglutide confirms these three sites as appropriate for Wegovy. If you want a closer look at which of these locations tends to work best and why, our guide to the best area to inject Wegovy walks through the pros and cons of each. If you want a broader look at how semaglutide works as a treatment, the Wegovy overview on our site covers the full picture.

Step 2 (Rotate methodically to protect your skin

Injecting into the same small spot repeatedly causes the fatty tissue underneath to become lumpy and thickened) a condition called lipohypertrophy. Once it develops, the medicine absorbs unpredictably from that area, which can affect how well your treatment works. Rotation is the straightforward fix.

Move at least 2–3 cm from where you injected last week within the same body area, and change the area itself on a regular cycle, for example, left thigh one week, abdomen the next, right thigh after that. Some people find it helpful to keep a simple note in their phone or on a sticky label on the pen box. The pen itself lives in the fridge door between doses; a quick note next to it means you rarely forget which site is next.

If you use the same area for several weeks running, feel the skin before you inject, if it feels firm or raised compared with the surrounding tissue, move elsewhere and mention it to your prescriber at the next review. Our page on the best way to inject semaglutide covers the full injection technique alongside site selection.

Step 3 (Prepare the site properly before each injection

Clean the chosen spot with an alcohol swab and let it dry completely) injecting through wet skin can sting more and may introduce residue into the injection site. Allow at least 20–30 seconds for the alcohol to evaporate fully. Pinch the skin gently to lift the tissue away from the muscle beneath, insert the needle at the angle described in your Patient Information Leaflet, press the injection button, and hold for the count of time the leaflet specifies before removing the pen, this ensures the full dose is delivered.

Use a fresh needle for every injection. Reused needles blunt quickly and increase the risk of pain, bent tips, and blocked doses. Compatible replacement needles are available from our pharmacy if you need a top-up between pens. After each injection, dispose of the needle immediately in an approved sharps container, never in a household bin.

Mild redness or a small raised area at the injection site is normal for a short time after injecting. According to the NHS England guidance on weight-management injections, injection-site reactions are among the most commonly reported effects and generally resolve without treatment. If redness spreads, or the site becomes hot, painful or swollen over several days, contact your prescriber or our aftercare team.

When to get medical help, and what to report

Most injection-site reactions are minor. Get medical attention promptly if you notice any signs of a serious allergic reaction, swelling of the face, lips or throat, difficulty breathing, or a severe rash. Persistent hard lumps or skin changes at injection sites that do not improve with better rotation should be reviewed by your prescriber.

More broadly, semaglutide carries a small risk of acute pancreatitis. Seek urgent medical help for severe, persistent abdominal pain that radiates to the back, especially if accompanied by vomiting. Any suspected side effect (at the injection site or elsewhere) can be reported directly to the MHRA using the Yellow Card scheme; this reporting helps the regulator monitor safety across the whole population using these medicines.

If you have questions about your specific injection routine or whether your current site choices suit you, our prescribers review every patient's progress and are available seven days a week through our aftercare service. You can also read about how to inject semaglutide for a full step-by-step walkthrough, or explore where to place semaglutide injections if you want to compare sites in more detail. For questions about the cost of private treatment, our Wegovy price comparison guide sets out what UK providers typically include, and what they often leave out.

If you are not yet on treatment and would like a clinical assessment, check your eligibility with our prescribers, no waiting list, reviewed the same day.