Weight Loss Injections: Understanding Your Options and Tracking Your Journey

The term "injection weight loss" covers several different medicines, and it is worth understanding that not all injectable medicines prescribed in weight-related contexts work the same way or are intended for the same purpose.

GLP-1 and dual GIP/GLP-1 receptor agonists

The most widely prescribed injectable medicines specifically indicated for chronic weight management are GLP-1 receptor agonists such as semaglutide (Wegovy) and the dual GIP and GLP-1 receptor agonist tirzepatide (Mounjaro). Both are once-weekly subcutaneous injections. They act on appetite-regulating pathways, and many people prescribed them report a meaningful reduction in food cravings — sometimes described as quieting "food noise" — alongside a greater sense of fullness. For a deeper look at how these work, see our guide to GLP-1 injection weight loss and the more detailed overview of Mounjaro injection weight loss.

Other injectables sometimes mentioned alongside weight

Some people searching this topic have been prescribed other injectable medicines — for example, dulaglutide (also a GLP-1 receptor agonist, primarily prescribed for type 2 diabetes), or hormone-based treatments such as leuprorelin (Prostap) or goserelin (Zoladex), which are used in conditions such as endometriosis or prostate cancer and may affect body composition as a secondary effect. Repatha (evolocumab) is a cholesterol-lowering injection with no direct weight-loss indication. If you have been prescribed any of these medicines, the context, purpose, and tracking needs will differ — always follow your prescriber or doctor's guidance on what to expect.

Injection sites and rotation

For the weekly GLP-1 and dual-agonist injectables, the most commonly used injection sites are the abdomen, the front of the thigh, and the upper arm. Rotating between sites with each injection is generally recommended to allow tissue to recover and to reduce the chance of injection-site reactions. Your prescriber or the patient information leaflet that came with your medicine will provide guidance on technique specific to your pen device. Our broader overview of weight loss injections covers the general principles in more detail, and if your medicine was prescribed through a particular pathway you may also find our page on NHS injection weight loss useful context.

Any side effects at the injection site — persistent redness, swelling, or lumps — are worth noting and discussing with your healthcare professional at your next appointment.

Staying consistent with a weekly injection schedule is one of the most practical challenges people face — especially when sites need rotating and doses change over time. GLP Trackr's injection-site tracking and rotation feature is built specifically for this: log each injection with the site you used, and the app keeps a rotation history and suggests where to inject next, so you never have to try to remember whether it was left abdomen or right thigh last week.

Alongside site tracking, the app's dose logging lets you record each injection's date, time, and dose strength in one place — useful both for your own peace of mind and as a clear record to bring to prescriber appointments. If you want to track how you feel after each dose, the side-effect log lets you note symptoms over time and spot patterns, which can be genuinely helpful to discuss with your doctor.

If you are also tracking the broader picture — weight, energy, food intake — GLP Trackr brings it all together in one place, so your injection data sits alongside your progress rather than in a separate notebook. For people looking at how B12 injections fit into their routine, our page on B12 injection weight loss has more context.

A note on safety: GLP Trackr is a tracking and journaling app — it is not a source of medical advice and does not replace your prescriber or doctor. If you experience any symptoms that are severe, persistent, or concern you, contact your healthcare professional promptly. Any decisions about your dose, injection schedule, or medicine belong with your prescriber, who knows your full history. If your medicine has a side-effect reporting scheme in your country (such as the UK's Yellow Card scheme), your prescriber or patient information leaflet can advise on how to report.

Ready to take the guesswork out of injection-site rotation? Download GLP Trackr on the App Store or Google Play and try it free for 7 days — no commitment needed.