Type 2 Diabetes Injections for Weight Loss: What to Know

GLP-1 receptor agonists — and, in the case of tirzepatide, dual GIP and GLP-1 receptor agonists — act on appetite-regulating pathways in the body. Many people prescribed these medicines report a reduced sense of hunger and increased feelings of fullness after eating. Slower gastric emptying is also commonly described, though this effect often lessens over time.

Both tirzepatide and semaglutide are given as once-weekly subcutaneous injections using pre-filled pen devices. The three most commonly used injection sites are the abdomen, upper thigh, and upper arm. Rotating between sites — rather than repeatedly injecting the same spot — is generally recommended to allow tissue to recover, and your prescriber or the patient information leaflet that came with your pen will guide you on technique and site selection.

Injection site rotation: why it matters

Injecting repeatedly into the same area can cause localised skin changes, which may affect how the medicine is absorbed. Keeping a record of where you last injected makes it straightforward to move around consistently. Many people find it easy to forget which site they used the previous week, especially across a long treatment period — which is where a simple log becomes genuinely useful.

For a broader overview of injectable weight-loss medicines, see our guide to weight-loss injections. You may also find it helpful to read about injections for weight loss generally, or explore information on fat-targeting injection approaches to understand how different options are described.

Staying consistent with a weekly injection schedule — and rotating sites properly — is much easier when you have a reliable record to refer back to. GLP Trackr is built specifically for people already on Mounjaro or Wegovy, and its injection-site tracking feature is designed exactly for this: log each injection, including the site you used, and the app tracks your rotation history and suggests where to inject next time. No guessing, no trying to remember.

Alongside site tracking, the app lets you log each dose with its date and strength, so you have a clear, timestamped record of your entire treatment history. Dose reminders help make sure a weekly injection does not slip by unnoticed — a small thing that can matter a lot over the course of a long programme.

If you experience any injection-site reactions or other symptoms you want to keep an eye on, GLP Trackr's side-effect log lets you record how you feel over time and spot any patterns worth raising at your next appointment. You can also explore our page on what to expect from weight-loss injections for more context on the journey.

Always follow the guidance of your prescriber or doctor — they know your full medical history and are best placed to advise on your injection routine, any reactions you notice, or any questions about your treatment. If you experience injection-site reactions that are severe, persistent, or concerning, contact your healthcare professional promptly. Any side effects worth reporting should go to your healthcare professional and, where relevant, to your national reporting scheme (such as the UK's Yellow Card scheme).

Ready to take the guesswork out of injection-site rotation? GLP Trackr is free to download on the App Store and Google Play — start your 7-day free trial and let the app handle the tracking while you focus on your journey.