Injection Sites Explained: Abdomen, Thigh, and Upper Arm
All three approved sites offer subcutaneous tissue suitable for a once-weekly injection. Here is what is generally understood about each:
Abdomen (stomach area)
The abdomen is one of the most commonly used sites. Injections are typically given into the fatty area around the stomach, avoiding the few centimetres directly around the navel. Many people find this site easy to reach and consistent to use. If you want to know more about specific stomach placement, see our guide on injecting Mounjaro in the belly.
Thigh
The front or outer thigh is another widely used option. When injecting into the thigh, the middle section of the front or outer thigh is generally used — avoiding the inner thigh and the area close to the knee. For a closer look at this site, our page on Mounjaro injection site guidance covers thigh placement in more detail.
Upper arm
The back of the upper arm can also be used, though it is harder to self-inject here without assistance. If you choose this site, it is worth discussing technique with your prescriber or a healthcare professional.
Why rotation matters
Using the same spot repeatedly can lead to localised changes in the skin and underlying tissue, which may affect how the medicine is absorbed over time. Rotating between sites — and varying the exact spot within each site — helps keep the tissue healthy. Your prescriber or the official patient information leaflet (PIL) that came with your pen will describe the recommended rotation approach for your specific medicine.
For guidance on timing your weekly injection, take a look at our article on the best time to inject Mounjaro. You can also find broader guidance in our overview of where to inject weight-loss injections.
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Keeping a mental note of which site you used last week — and exactly where within that site — is easy to forget, especially as your routine settles in. GLP Trackr's injection-site tracking feature is built for this: each time you log a dose, you record the site you used, and the app tracks your rotation history so it can suggest where to inject next time. That means consistent rotation becomes automatic rather than something you have to remember.
Alongside site tracking, the app logs the dose strength, date, and time of each injection, giving you a clear record to look back on. If you ever want to discuss your injection history with your prescriber — whether that's about site reactions, timing, or anything else — that log is ready to share.
Dose reminders are also built in, so your weekly schedule stays on track without relying on memory alone.
If you notice any injection-site reactions — redness, swelling, or discomfort — it is worth logging these and mentioning them to your healthcare professional. Always follow the guidance of your prescriber or doctor; they know your full history and can advise on any site-specific concerns. For a broader look at managing your injection routine, visit our weight-loss injections hub.
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Frequently asked questions.
Mounjaro is injected subcutaneously into one of three sites: the abdomen (avoiding the area around the navel), the front or outer thigh, or the back of the upper arm. Your prescriber or the patient information leaflet supplied with your pen will confirm the recommended technique.
Wegovy is also given as a subcutaneous injection into the abdomen, thigh, or upper arm — the same three sites used for Mounjaro. Always refer to your prescriber or the leaflet that came with your pen for guidance specific to your prescription.
Yes. Rotating between sites — and varying the exact spot within each site — helps prevent localised skin and tissue changes that can develop if the same area is used repeatedly. Your prescriber or patient information leaflet will describe the recommended rotation approach.
There is no universally 'best' site for weight-loss results. All three approved sites — abdomen, thigh, and upper arm — deliver the medicine subcutaneously. Consistent rotation and correct technique matter most. Discuss any site preferences or concerns with your prescriber or doctor.
GLP Trackr lets you log each injection site when you record a dose. The app tracks your rotation history and suggests where to inject next, making consistent rotation easy to maintain without relying on memory.