Where to inject Wegovy: the best sites and how to rotate them

What the official guidance actually tells us about injection sites

The Wegovy Summary of Product Characteristics (the prescribing document that sits behind every dose decision) specifies three acceptable subcutaneous injection sites: the abdomen, the upper thigh, and the upper arm. This matches the standard recommended by NHS England's guidance on weight-management injections. Subcutaneous means into the layer of fatty tissue just beneath the skin, not into a muscle.

All three sites produce consistent semaglutide absorption. The evidence from the STEP 1 trial (68 weeks, nearly 1,300 adults receiving 2.4 mg semaglutide) did not single out any one site as superior; participants used all three interchangeably across the trial's duration. In practice, most people start with the abdomen because it's easiest to see and reach independently, then move on to the thigh or upper arm once confidence grows.

For the abdomen, inject into the soft fatty tissue to either side of the navel, keeping a clear gap of at least 5 cm from the belly button itself. If you want a detailed breakdown of the best place for your Wegovy injection, including how each site compares in terms of comfort and accessibility, our dedicated guide goes through each option step by step. The back of the upper arm is the third; most people need someone else's help to reach it comfortably, or use a mirror.

Why rotating the injection site matters

Injecting repeatedly into the same small patch of skin causes a condition called lipohypertrophy: the fatty tissue hardens and becomes lumpy. Medicine injected into hardened tissue is absorbed unpredictably, which can blunt the effect of each dose. Keeping a weekly rotation (moving around the abdomen in a clockwise pattern, or alternating between left and right thigh) prevents this.

A sensible rotation plan keeps each new injection site at least 2–3 cm from the last one. Some people find it helpful to use a simple notebook or the notes app on their phone to log where they injected that week. It sounds fussier than it is. After a few weeks it becomes automatic.

If you notice persistent redness, firmness, or a lump at a site, stop using that area until it fully settles and mention it to your prescriber. Mild injection-site reactions are listed among the common side effects of semaglutide; they're usually short-lived and resolve without treatment. For a broader picture of how Wegovy works and what to expect, our treatment overview covers the full picture.

Practical technique: the things that actually help

Let the pen reach room temperature before you inject. Wegovy is stored in the fridge, and a cold pen against warm skin can sting unnecessarily. Taking it out around 30 minutes before your scheduled injection is usually enough.

Clean the chosen site with an alcohol swab and let it dry fully, damp skin can sting on contact with the needle. Alcohol swabs are straightforward to keep alongside your pen. Pinch the skin gently if you're lean, press the pen firmly against the skin, and hold it in place for the count specified in the Patient Information Leaflet after pressing the button, this ensures the full dose is delivered before you remove the pen.

Pick a regular day and time for your weekly injection and stick to it. A consistent routine makes it easier to remember and easier to plan around things like a bank holiday, a holiday abroad, or a week when your delivery arrives on a different day than usual. If you're unsure about the best place to inject semaglutide on days when your usual routine is disrupted, our guidance covers how to adapt without compromising your dose. Used pens are sharps and must be disposed of safely; a sharps container is the correct way to do that, not a household bin.

A note on self-injection confidence

Hesitation about injecting yourself is completely normal. A question our prescribers hear regularly is whether the fear gets easier, it almost always does, usually within the first two or three injections. The Wegovy pen is designed to conceal the needle, and you don't need to see it at all if that helps.

If you're looking for guidance on the best place to inject Wegovy because you're deciding whether to start, or you're already on treatment and want to refine your approach, the most important thing is that injection anxiety doesn't have to be a barrier. Speak to your prescribing team before adjusting anything about your routine. The frequently asked questions on our site cover some of the most common injection worries, or you can reach out through our support team any day of the week.

If you haven't yet started treatment and want to understand where the best place is to inject Wegovy before you begin, that guide is a helpful starting point alongside our full range of weight-loss options. When you're ready, speaking to our prescribers is the natural next step.