Injection Sites and Why Rotation Matters
Both Mounjaro and Wegovy are once-weekly subcutaneous injections, meaning the medicine is delivered just beneath the skin rather than into a muscle. The three areas most commonly used are:
- Abdomen — anywhere on the belly away from the navel (usually leaving a few centimetres clear around it)
- Front of the thigh — the outer portion of the upper leg
- Upper arm — the back or outer area of the upper arm (often easier with assistance)
Rotating injection sites — moving to a different spot or a different area each week — is considered good practice because repeatedly injecting the same location can lead to changes in the skin and underlying tissue over time. These changes can affect how reliably the medicine is absorbed. Always follow the specific guidance in the patient information leaflet that came with your pen, and check with your prescriber or doctor if you are unsure which sites are suitable for you personally.
Within any single area, it also helps to vary the exact spot slightly rather than always using one precise point. Think of each zone as having multiple positions you can cycle through over successive weeks.
For a broader overview of how these medicines are administered, see our guide on weight loss injections — what to know. You may also find it useful to read about Mounjaro injection guidance if tirzepatide is your prescribed medicine, or explore general weight loss injection information for more context.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
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How GLP Trackr Helps You Stay on Top of Your Injections
Keeping track of which site you used last — and when — is surprisingly easy to lose track of across a weekly schedule. GLP Trackr's injection-site tracking feature lets you log each injection with the area used, and the app then suggests your next rotation site automatically, so you never have to guess or try to remember.
Alongside site logging, the app records the date, time, and dose strength of every shot, building a clear history of your treatment in one place. Dose reminders mean your weekly schedule stays on track even when life gets busy — the app sends a gentle nudge so a dose is never quietly missed. If you are curious how Mounjaro interacts with other injectables you may be using, our page on Mounjaro and other injectable medicines covers some of the common questions, and you can also explore information about prescribed injectable treatments for further background.
Any concerns about your injection technique, a site reaction, or whether a particular area is appropriate for you should always be directed to your prescriber or doctor — they know your full medical history and can give guidance tailored to your situation. If you notice a site reaction that is severe, spreading, or not settling, contact a healthcare professional promptly rather than waiting for your next scheduled appointment.
Ready to log your shots and take the guesswork out of rotation? GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and let the app handle your injection history from day one.
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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.
The three commonly used sites for once-weekly injectable weight loss medicines are the abdomen, front of the thigh, and upper arm. Your prescriber or doctor can confirm which areas are suitable for you, and the patient information leaflet with your pen provides specific guidance.
Yes, rotating between different sites and spots within each area is widely recommended. Repeatedly using the same location can cause local skin changes over time, which may affect how well the medicine is absorbed. Your prescriber or the leaflet with your pen can advise on a suitable rotation pattern.
There is no single best site — suitability depends on the individual. The abdomen, thigh, and upper arm are all commonly used. Your prescriber or doctor is best placed to advise based on your circumstances, and the patient information leaflet provides product-specific guidance.
GLP Trackr lets you log each injection with the site used, then suggests your next rotation automatically. It also records the date, time, and dose strength of every shot, giving you a clear history to refer back to or share with your prescriber.
Mild, short-lived redness or tenderness at an injection site is commonly reported. If a reaction is severe, spreading, or not settling, contact your healthcare professional promptly rather than waiting. Never try to manage a significant site reaction without clinical guidance.