Free Weight Loss Injections: What They Are and How to Track Your Journey

Mounjaro and Wegovy are both once-weekly injectable medicines that act on appetite-regulating pathways in the body. Mounjaro's active substance is tirzepatide, a dual GIP and GLP-1 receptor agonist; Wegovy's active substance is semaglutide, a GLP-1 receptor agonist. Both are prescription-only medicines in most countries, meaning a qualified prescriber must assess whether they are appropriate for you before they can be dispensed.

In some countries, publicly funded health programmes cover these medicines for people who meet specific clinical criteria — such as a particular BMI threshold or the presence of certain weight-related health conditions. In other cases, people access them through private prescribers and registered pharmacies. Whether any funded route applies to you is a question only your prescriber or doctor can answer, based on your health history and the rules of your local healthcare system.

Injection sites and rotation

Once prescribed, these medicines are typically injected once a week into subcutaneous tissue — commonly the abdomen, thigh, or upper arm. Rotating the injection site each week is generally recommended to allow the skin and tissue to recover between doses. Your prescriber or the patient information leaflet that came with your pen will give you guidance specific to your medicine. For a broader overview of accessing these medicines, see our guide on weight loss injections, and if you are researching access routes in more detail, our page on whether you can get free weight loss injections covers eligibility considerations. For context on how costs vary, our overview of weight loss injection prices explains the general landscape without quoting specific figures.

These medicines are subject to additional monitoring in a number of countries. If you experience a side effect, report it to a healthcare professional and to your national reporting scheme (such as the UK's Yellow Card scheme) as appropriate.

Once you are on a weekly injection schedule, keeping track of which site you used last — and when your next dose is due — quickly becomes one of the most practical challenges of GLP-1 life. GLP Trackr's injection-site tracking feature is built specifically for this: log each injection with the site (abdomen, thigh, or upper arm), and the app keeps a rotation history and suggests where to inject next, so you never have to try to remember.

Alongside site rotation, the app logs each dose with its date, time, and strength — giving you a clear, searchable record of your entire treatment history. Dose reminders mean a weekly injection is far less likely to slip your mind, and if you do need to note a missed dose to discuss with your prescriber, you can log that too.

For those who want a free weight loss app that genuinely understands the GLP-1 journey — not just a generic calorie counter — GLP Trackr also brings together food logging, weight tracking, and side-effect recording in one place, so your progress picture is complete rather than scattered across different apps and notebooks.

Always follow the guidance of your prescriber or doctor — they know your full medical history and are the right person to advise on your dose, your injection technique, and whether this treatment is right for you. GLP Trackr helps you record and organise your journey; it is not a substitute for clinical advice.

Ready to take the guesswork out of injection-site rotation? GLP Trackr is available on the App Store and Google Play — try it free for 7 days and see how much easier a structured log makes your weekly routine.