Common Injection Sites and Why Rotation Matters
Most prescribers direct people to one of three areas for their weekly injection: the abdomen (at least a few centimetres away from the navel), the front or outer thigh, or the outer upper arm. Each site has a layer of fatty tissue beneath the skin that makes subcutaneous injection possible.
Why you should rotate sites
Using the same spot repeatedly can lead to lipohypertrophy — a build-up of fatty or hardened tissue under the skin. This is most familiar from insulin users but applies to any regular subcutaneous injection. Hardened tissue can affect how the medicine is absorbed, which is why varying both the site and the specific spot within each site is worth doing.
A simple approach many people follow is to work through the three sites in a set order — for example, abdomen one week, thigh the next, upper arm the following week — and then repeat. Within each area, moving a few centimetres from the previous spot each time adds another layer of variation.
A few practical points
- Avoid skin that is bruised, scarred, irritated, or has active lipohypertrophy.
- The upper arm can be harder to reach unassisted — some people find this site easier with help.
- Your prescriber or the patient information leaflet that came with your pen is the best place to confirm the technique and any site-specific guidance for your particular medicine.
For more detailed guidance on injecting Mounjaro specifically, see where to inject Mounjaro and Mounjaro injection site guidance. For a broader look at how weekly injections work, visit our weight loss injections overview.
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How GLP Trackr Helps You Stay on Top of Injection Site Rotation
Keeping a mental note of which site you used last week is easy to forget — especially if you are also managing dose changes, side effects, and everyday life. GLP Trackr's injection-site tracking feature logs each injection with the site you used, and then suggests where to inject next based on your rotation history. There is no guessing involved.
Beyond site rotation, the app also logs your dose strength and the date and time of each injection, so your full injection record is in one place. If you ever need to recall when you last injected — or bring a clear summary to a prescriber appointment — the information is already there.
Dose reminders are also built in, so your weekly schedule stays on track even when life gets busy.
Always follow the specific guidance your prescriber has given you about injection technique and site selection — they know your individual circumstances. If you notice persistent skin reactions, lumps, or anything unusual at an injection site, contact your healthcare professional rather than continuing to inject in that area.
Ready to take the guesswork out of rotation? GLP Trackr logs every injection and keeps your site history on hand. Download it free on the App Store or Google Play — your first seven days are free to try.
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Frequently asked questions.
The three commonly used sites are the abdomen (away from the navel), the front or outer thigh, and the outer upper arm. Each provides the subcutaneous fatty tissue needed for the injection. Your prescriber or patient information leaflet will confirm the best approach for your specific medicine.
Yes, rotating sites is generally recommended. Using the same spot repeatedly can cause hardened tissue (lipohypertrophy) under the skin, which may affect how the medicine absorbs. Alternating between the abdomen, thigh, and upper arm helps keep skin healthy.
There is no single best site — all three commonly used sites (abdomen, thigh, upper arm) are generally considered suitable. Your prescriber is the right person to advise on which works best for your circumstances, as individual factors can influence the recommendation.
GLP Trackr's injection-site tracking logs each injection and suggests your next site based on your rotation history, so you never have to remember manually. You can also record dose strength and date alongside the site for a complete injection log.