Wegovy administration sites: where to inject and how to rotate

Which three areas of the body can you use for a Wegovy injection?

The licensed injection sites for Wegovy are the abdomen (your tummy), the front or outer thigh, and the outer upper arm. You can use any of these interchangeably, clinical evidence does not show a meaningful difference in how semaglutide is absorbed between the three. What matters far more is that you rotate consistently and look after the skin in each area.

The abdomen tends to be the first choice for people injecting themselves at home. There is usually more tissue to work with, it is straightforward to pinch, and you can see what you are doing. The thigh is a solid alternative, particularly if you are sitting down. The upper arm is the trickiest to reach solo, so it is the one most people reserve for times when someone else can help, a partner doing the injection on your behalf, for instance.

NHS guidance on semaglutide covers the basic site advice, and Novo Nordisk's Patient Information Leaflet (available on the eMC, the electronic Medicines Compendium) spells out the exact technique in full. If you have any doubt about which site suits your situation, the team at our pharmacy can point you to the right resource.

How should you rotate injection sites to protect the skin?

Injecting into exactly the same spot every week can cause lipohypertrophy, a thickening or lumpiness under the skin that actually slows drug absorption. Rotation is the straightforward fix.

The practical rule: never inject into the same spot twice in a row. If you used the right side of your abdomen last week, use the left this week. Within each site, aim to move at least 2 cm (roughly a finger's width) from any previous injection point. Some people find it helpful to work around a notional clock face on the abdomen, moving one position each week.

Keep away from areas that are bruised, sore, or have any skin change, redness, hardness, a scar, or a stretch of skin that feels thicker than usual. Tattoos are worth avoiding too, simply because it is harder to assess any skin reaction through the ink. A quick check before you inject takes seconds and becomes second nature after a few doses.

For a more detailed walk-through of the whole process, the full Wegovy administration instructions cover preparation, injection technique, and what to do after the dose. There is also a step-by-step video guide to semaglutide injection if seeing the technique demonstrated is more useful than reading about it.

Does it matter what time of day you choose an injection site?

Wegovy is a once-weekly injection, so you choose a day of the week that suits your routine and stick to it. The time of day within that day does not affect how well the medicine works, morning, afternoon, and evening all give you the same pharmacokinetics. What matters is consistency: same day each week, rotating the site.

One thing worth knowing: if you are also taking an oral medication in the morning (a blood-pressure tablet, say, or a contraceptive pill) semaglutide slows gastric emptying slightly, which can affect absorption of other medicines taken at the same time. Your prescriber is the right person to advise on timing if this applies to you. The broader question of how oral contraceptive absorption is affected on semaglutide versus tirzepatide is covered clearly in NHS England's guidance on weight-management injections.

If you miss a dose entirely, do not double up the following week. The Patient Information Leaflet gives the exact rules for missed doses; your prescriber at our support team can also advise. Changing your injection day is allowed, as long as two doses stay at least four days apart.

What local reactions should you watch for at the injection site?

Mild reactions at the injection site are fairly common when starting Wegovy, a small amount of redness, itching, or bruising around the spot you injected. These typically settle within a day or two. Keeping the skin clean with an alcohol swab before injecting and letting it dry fully before the needle goes in helps reduce the risk.

If you notice a persistent lump or thickened patch developing at a site you have been using repeatedly, that is a sign to rest that area and work through the rotation more deliberately. Our guide to Wegovy injection sites covers how to identify and rest affected areas, and is worth reviewing if you are unsure whether your rotation is working well. Let your prescriber know at your next review.

Anything beyond mild and short-lived (swelling, warmth, or a reaction that spreads rather than fades) warrants a call to a clinician. A serious allergic reaction to Wegovy is rare but possible; symptoms such as a rash, facial swelling, or breathing difficulty need urgent medical attention. The NHS semaglutide medicines page lists the full side-effect profile alongside guidance on when to seek help. You can also report any suspected reaction directly through the MHRA Yellow Card scheme.

If you are considering starting Wegovy and want to understand more about what treatment involves day to day, exploring your treatment options with our prescribers is a sensible place to begin. We also have a broader overview of how Wegovy works and, if cost is on your mind, a plain account of what Wegovy costs privately. You can also read more about how semaglutide is administered and why the subcutaneous route is used if you would like a fuller picture before your first injection.