Wegovy injection sites: where to inject, how to rotate, and what to expect

Your first injection: picking your starting site

Picture this: the plain, unbranded box has arrived via DPD, your pen is in the fridge, and you are about to do your first injection. The question most people ask at that point is not philosophical, it is practical. Where exactly do I put this?

The abdomen is where most people begin. Aim for the area between your navel and your hip, staying at least 5 cm away from the navel itself. Pinch a small fold of skin between your fingers, hold the pen flat against it, and press the button to start the injection. The needle is short and fine, and the injection is slow, roughly ten seconds. Most people are pleasantly surprised.

The thigh is the second most common choice. Use the front or outer portion of your upper thigh, roughly halfway between your knee and hip. It is easy to reach without assistance and gives you a clear view of what you are doing, which helps if you are learning. Injecting Wegovy into the thigh can feel slightly different from the abdomen because there is often less subcutaneous tissue there, but it is equally effective.

The upper arm (specifically the fatty area on the back of the upper arm) is the third site. It is harder to self-inject here, so it works best when a partner, family member or carer is helping. If you are self-injecting, the thigh or abdomen will serve you better. Injecting into the arm is an option worth knowing about, though most people settle on one of the other two.

For authoritative detail on site technique, the NHS semaglutide medicines page covers subcutaneous injection guidance alongside other practical information about the medicine.

Rotation: the rule that protects your skin

Using the same spot week after week can cause a reaction called lipohypertrophy, a build-up of fatty tissue that makes the skin feel lumpy and can actually slow how well the medicine is absorbed. Rotating solves both problems at once.

The practical approach is to treat each site as a zone with several positions inside it. On the abdomen, for example, you might work around an imaginary clock face: left side one week, lower right the next, upper left the week after. On the thigh, alternate legs. If you use all three sites, a simple rotation might be abdomen, right thigh, abdomen, left thigh, upper arm, whatever pattern you can actually remember.

What matters is that you are not injecting into skin that is still tender or visibly marked from the previous week. Press gently on the spot before each injection; if it is sore, move a few centimetres. Which sites to use for your Wegovy injection depends partly on your own body and build, so it is worth experimenting in the first month.

If you notice persistent redness, swelling or unusual skin changes at any injection site, mention it at your next clinical review, or contact your prescriber sooner if it is bothering you.

Practical prep: before and after each injection

Let your pen reach room temperature for about 30 minutes before injecting, a cold injection from the fridge is noticeably more uncomfortable. Check the solution through the pen window: it should be clear and colourless with no particles. Do not shake it.

Clean the skin with a swab and let it dry fully before injecting; wet skin stings more. Alcohol swabs are inexpensive and worth keeping beside your pen. Once the injection is done, do not rub the site, gentle pressure with a clean finger is fine if there is any bleeding.

Used pens contain a concealed needle that locks automatically after use. Dispose of them in a proper sharps container rather than the household bin; your local pharmacy or GP surgery can advise on collection points.

If you want a closer look at how to prepare and use each location correctly, our guide to the Wegovy injection site walks through the technique in detail, including what to look for before and after each use. For context on the wider treatment, our weight-loss treatment overview explains what a full course of Wegovy involves from start to finish.

When something does not feel right

Most injection-site reactions (mild redness, a small bruise, brief itching) settle within a day or two and are not a reason to stop. Move to a different site next time and keep going.

Seek medical help promptly if you develop a large, spreading area of redness or swelling, signs of an allergic reaction (rash, swelling of the face or throat, difficulty breathing), or severe stomach pain that extends towards the back. The MHRA's January 2026 Drug Safety Update flagged acute pancreatitis as a known but infrequent risk with GLP-1 medicines, severe, persistent stomach pain warrants urgent assessment regardless of whether it feels injection-related. You can report any suspected side effect through the Yellow Card scheme.

Our prescribers are available for aftercare seven days a week. If you are unsure whether what you are experiencing is normal, getting in touch is always the right call. Wegovy is a prescription medicine and the clinical relationship does not end when your pen arrives.

If you have not yet started treatment and want to understand whether Wegovy might be right for you, start your free consultation with our GPhC-registered prescribers.