Mounjaro Injection Sites: Abdomen, Thigh, and Upper Arm
All three commonly used injection sites deliver the medicine into the fatty tissue just beneath the skin. Here is what to know about each:
Abdomen
The abdomen is the most commonly chosen site. Suitable areas are generally a few centimetres away from the navel. It tends to be easy to reach and has a good amount of subcutaneous tissue for most people.
Front of the thigh
The outer front of the thigh — roughly the middle section — is another well-used site. This is particularly convenient if you are self-injecting and find the abdomen harder to access. If you are wondering specifically where to jab Mounjaro in the leg, the outer mid-thigh is the standard area referenced in the product information; avoid the inner thigh and areas close to the knee.
Upper arm
The outer area of the upper arm can also be used, though self-injection here can be more awkward. Some people find it easier to use this site when someone else is helping, or with practice.
Why rotation matters
Using the exact same injection site every week can cause skin changes such as hardening or dimpling (a condition called lipohypertrophy), which may affect how the medicine is absorbed. Rotating systematically — moving to a different site, or a different part of the same site — helps avoid this. Your prescriber or the leaflet in your pack will confirm the rotation approach that suits you.
The same three injection sites apply for Wegovy (semaglutide) — so if you are comparing notes or researching both medicines, the practical guidance on site rotation is very similar.
For broader context on once-weekly weight-loss injections and how they work, see our guide to weight-loss injections. You may also find it useful to read about Mounjaro as a weight-loss jab for general background on the medicine.
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How GLP Trackr Helps You Track Injection Sites and Rotation
Keeping a mental note of which site you used last week is easy to forget — especially once you are several months into a weekly routine. GLP Trackr's injection-site tracking feature is built specifically for this.
Each time you log a dose, you record which site you used — abdomen, thigh, or upper arm — and the app tracks your rotation history. Based on your recent entries, it can suggest which site to use next, so you never have to remember which spot you used two or three weeks ago.
Alongside site rotation, the app logs the date, time, and dose strength of every injection. That means you have a clear record to refer back to — useful if you ever want to discuss your injection history with your prescriber, or simply want to confirm your weekly schedule is on track.
If you experience any injection-site reactions — redness, swelling, or discomfort — you can note these in the app too. Spotting patterns over time makes those details easier to bring up at your next appointment. You might also find it helpful to explore the fat jab Mounjaro overview or read more about what is sometimes called the skinny jab for additional context on the medicine people are tracking.
Always follow the injection guidance provided by your prescriber or the information leaflet in your pen — the app helps you record what you do, but your healthcare professional is the right person to advise on technique and any concerns.
Ready to take the guesswork out of site rotation? GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and let it suggest your next injection site automatically.
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Beautiful, easy-to-read charts show your weight loss trajectory, weekly nutrition trends, medication responses, and wellbeing scores over time — turning raw data into genuine insights.
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Frequently asked questions.
Mounjaro is injected into subcutaneous (fatty) tissue in one of three areas: the abdomen, the front of the thigh, or the outer upper arm. Your prescriber or the patient information leaflet supplied with your pen will confirm the correct technique for your circumstances.
The outer front of the mid-thigh is the standard area used for thigh injections with Mounjaro. Avoid the inner thigh and the area close to the knee. Always check the leaflet that came with your pen for precise guidance on the injection area.
Yes. Rotating injection sites helps protect the skin and supports consistent medicine absorption. Using the same spot repeatedly can cause skin changes that may affect how well the medicine is absorbed. Your prescriber can advise on a rotation pattern that works for you.
The injection sites for Wegovy (semaglutide) are the same three areas used for Mounjaro: the abdomen, the front of the thigh, and the outer upper arm. Rotation between sites is equally important for both medicines.
GLP Trackr lets you log each injection site alongside your dose and date. It tracks your rotation history and can suggest which site to use next, so you always have a clear record to refer to and never have to rely on memory alone.