Wegovy Injection Sites: Where to Inject, How to Rotate, and What to Watch For

The standard injection sites for Wegovy — and for Mounjaro (tirzepatide), which uses the same approach — are the abdomen (at least a few centimetres away from the navel), the front and outer thigh, and the outer upper arm. Your prescriber or doctor, or the patient information leaflet that came with your pen, will give you specific guidance on technique and exact placement; the notes here are general and informational only.

Why Rotation Matters

Rotating sites between injections helps prevent a build-up of scar tissue or lipohypertrophy — small, rubbery lumps under the skin that can develop if the same patch of skin is used repeatedly. If you notice a firm lump at an injection site, mention it to your healthcare professional rather than continuing to inject into that area.

Reactions at the Injection Site

Mild reactions at or around the injection site are commonly reported with both Wegovy and Mounjaro. These can include:

• Redness or a small raised area — often settles within a few hours
• Itching — a frequently reported reaction; mild itching around the site is common in the days after injection
• Bruising or a small bleed — nicking a tiny capillary can cause minor bruising, which usually fades on its own
• A lump or hardness beneath the skin — may indicate the injection was placed too shallowly, or that rotation has not been consistent enough

These reactions are generally mild and temporary. However, if you experience a spreading rash, significant swelling, or persistent redness that does not settle, contact your healthcare professional promptly — these could indicate a more significant reaction that needs assessment.

Arm, Thigh, and Abdomen: Is One Site Better?

There is no single universally "best" site — absorption and comfort vary between individuals, and the most important habit is consistent rotation rather than sticking to one preferred area. Many people do find the abdomen easiest to self-inject into; the upper arm can be harder to reach without assistance. For a closer look at specific site considerations, see the general guidance on choosing your injection site or the detailed notes on using the thigh as an injection site.

If you notice consistent reactions in one particular location — for example, a red, itchy patch every time you inject into the arm — it is worth discussing this pattern with your prescriber. Tracking where and when reactions occur makes these conversations much more productive. For more on managing reactions specifically, the page on injection site reactions on Mounjaro covers this in greater detail.

Remembering which site you used last week — and whether that was the left or right side — is surprisingly easy to lose track of across a months-long treatment programme. GLP Trackr's injection-site tracking feature is built specifically for this: each time you log a dose, you record the site and side used, and the app tracks your rotation history so it can suggest where to inject next.

Beyond rotation, the app's side-effect logging lets you note any skin reactions — itching, redness, bruising, or a lump — alongside the site where they occurred. Over time, this builds a clear picture of any patterns: if reactions are consistently linked to one site or one pen batch, that information is genuinely useful to bring to your next prescriber appointment. The app's doctor report feature lets you share a summary of your injection log and any reactions in a format that is easy to discuss.

If you ever miss a dose or are unsure about your schedule, log it in the app and raise it with your prescriber or doctor — dose decisions always belong with them, not with an app.

GLP Trackr is part of a broader approach to tracking your weight-loss injection journey — you can explore everything the app supports on the weight loss injections hub.

Safety note: If a reaction at any injection site is severe, spreading, or does not improve within a day or two, contact your healthcare professional promptly. Any side effect you consider serious should also be reported through your national reporting scheme (such as the UK's Yellow Card scheme) in addition to telling your prescriber. GLP Trackr helps you record what you experience — it is not a substitute for clinical assessment.

Log your injection sites, track rotation automatically, and keep a record of any reactions to discuss with your prescriber. Download GLP Trackr on the App Store or Google Play — your first 7 days are free.