Injection Sites and Why Rotation Matters
Both Mounjaro and Wegovy are once-weekly subcutaneous injections, meaning they are delivered just beneath the skin. The three commonly used sites are:
- Abdomen — the area around the stomach, avoiding a small radius around the navel
- Upper thigh — the front or outer portion of either thigh
- Upper arm — the outer area of either upper arm (often easier with assistance)
Using the same spot repeatedly can lead to localised skin reactions or changes in tissue that may affect how the medicine is absorbed. Rotating between sites — and within a site, moving to a slightly different spot each time — is a standard part of managing a weekly injection routine. Your prescriber or the patient information leaflet that came with your pen will give you the most accurate guidance on technique and site selection for your specific medicine.
For a broader overview of these medicines and how they work, see our guide to weight loss injections. You may also find it useful to read about how weight loss injections are used in practice, or to explore questions around fat-targeted injection approaches if you have come across that topic in your research.
According to the electronic Medicines Compendium (eMC), rotating injection sites is part of the standard administration guidance for both tirzepatide and semaglutide pre-filled pens. Always check the patient information leaflet included with your specific pen for the most precise instructions.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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How GLP Trackr Helps You Stay on Top of Your Injection Routine
Keeping track of where you last injected — and when — is easy to forget over a weekly schedule. GLP Trackr's injection-site tracking feature lets you log each injection with its site, date, and dose strength, and the app uses that history to suggest your next rotation site automatically. You never have to try to remember whether you used the left thigh or the abdomen two weeks ago.
Alongside site tracking, the app's dose reminder feature means your weekly injection day stays on your radar without you having to set a separate calendar alert. If a dose is ever logged late or missed, you will have a clear record to discuss with your prescriber at your next appointment — the app makes it straightforward to bring a complete injection history to that conversation.
If you are curious about the broader range of injection-related questions people have when starting out, our page on accessing weight loss injections may be helpful background reading.
GLP Trackr is available free on the App Store and Google Play, with a 7-day free trial — log your first injection site today and let the app handle the rotation tracking from there.
Any questions about your injection technique, site choice, or dose should always go to your prescriber or doctor — they know your individual circumstances and can give you guidance that no app can replace. If you notice a persistent or unusual reaction at an injection site, contact your healthcare professional promptly.
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Injection Tracking
Log every dose with a single tap. Track your dose history, phase in your cycle, estimated medication levels, and upcoming injection dates — with reminders so you never miss a scheduled shot.
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Frequently asked questions.
These once-weekly injections are typically given subcutaneously into the abdomen, upper thigh, or outer upper arm. Your prescriber or the patient information leaflet supplied with your pen will confirm the correct technique and site guidance for your specific medicine.
Rotating sites helps avoid repeated pressure on the same area of skin and tissue, which can cause localised reactions and may affect how the medicine is absorbed. Moving to a different site — or a different spot within the same area — with each weekly injection is standard practice.
Many people find it surprisingly easy to lose track over a weekly schedule. Logging each injection in an app like GLP Trackr records the site, date, and dose, and the app can suggest your next rotation site based on your history so you always have a clear record.
Mild redness or tenderness at the injection site is commonly reported. If a reaction is persistent, spreads, or causes you concern, contact your healthcare professional promptly. Never attempt to treat a significant injection-site reaction without professional guidance.
Yes. GLP Trackr includes a dose reminder feature that keeps your weekly injection schedule on track. You can also log a missed dose in the app to have a clear record ready to discuss with your prescriber.