Injection Sites, Rotation, and What Your Prescriber Will Have Told You
Mounjaro and Wegovy are both injected subcutaneously — into fatty tissue just beneath the skin. The three areas most commonly used are the abdomen (avoiding the area immediately around the navel), the front of the thigh, and the upper outer arm. Your prescriber or the patient information leaflet that came with your pen will describe the recommended technique and sites for your specific medicine.
Why Rotation Matters
Using the same injection site repeatedly can cause a condition called lipohypertrophy — a build-up of fatty or hardened tissue under the skin that can affect how the medicine is absorbed. Rotating between different sites, and varying the exact spot within each area, helps to keep the tissue healthy and absorption consistent. Many people find it surprisingly easy to lose track of which site they used last, especially week to week — which is where logging each injection becomes genuinely useful.
Shortage and Supply Considerations
If you have been searching for information about the weight loss jab shortage affecting availability in some countries, it is worth speaking directly to your prescriber or a registered pharmacy. They are best placed to advise on current supply and any alternatives relevant to your situation. GLP Trackr does not supply or source medication.
Choosing Between Jabs
If you have questions about how different weight loss injections compare, that is a conversation for your prescriber — they can weigh up which medicine is appropriate for your individual circumstances. For a broader overview of injectable weight loss medicines, the weight loss injections guide covers the key facts in one place.
For general factual information about these medicines, the electronic Medicines Compendium (medicines.org.uk) holds the official patient information leaflets for both Mounjaro and Wegovy — a useful reference for any questions about your specific pen device.
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 Injections
Keeping track of which site you injected last — and when — is one of those small tasks that is easy to overlook but matters more than it sounds. GLP Trackr's injection-site tracking feature lets you log each injection by location (abdomen, thigh, or arm) and then suggests where to rotate next, so you never have to rely on memory alone.
Alongside site rotation, the app logs the date, time, and dose strength of every injection, giving you a clear record of your full treatment history in one place. If you ever need to refer back — for a prescriber appointment, or simply to confirm when your last dose was — it is all there.
The app also includes dose reminders, which are particularly useful for a once-weekly schedule where it is easy to lose track of which day you injected. Missing a dose is worth discussing with your prescriber; logging it in the app means you have an accurate record to bring to that conversation rather than having to estimate.
For a full picture of how the app supports your injectable treatment journey, visit the weight loss jab tracking overview.
A note on safety: If you have any concerns about an injection site — redness, swelling, or persistent discomfort — contact your prescriber or doctor. GLP Trackr is a tracking tool and is not a substitute for clinical guidance. Any questions about injection technique should be directed to your healthcare professional or the patient information leaflet for your medicine.
Ready to take the guesswork out of site rotation? GLP Trackr is free to try for seven days — download it on the App Store or Google Play and let the app handle the rotation reminders while you focus on your journey.
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Morning Check-In
Start every day with a 60-second wellness check-in. Log how you're feeling, track nausea, appetite, energy, and mood — giving you and your care team a complete picture of how your medication is working.
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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Staying hydrated is especially important on GLP-1 medications. Set daily water targets, log intake throughout the day, and receive smart nudges when you're falling behind your goal.
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Progress Analytics
Beautiful, easy-to-read charts show your weight loss trajectory, weekly nutrition trends, medication responses, and wellbeing scores over time — turning raw data into genuine insights.
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Snap a photo of any meal and get a full nutrition breakdown in seconds — calories, protein, carbs, fat, and fibre. No searching. No manual logging. Just point, snap, and track.
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Log walks, workouts, and movement with activity targets that flex with your energy levels. On lower-energy dose days, gentler targets keep you moving without burning out.
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GLPIQ learns your personal side effect patterns over time. After a few cycles, it starts warning you the morning before a rough day — and adjusts your meal plan automatically.
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Frequently asked questions.
Both Mounjaro and Wegovy are injected subcutaneously — under the skin — in the abdomen, front of the thigh, or upper outer arm. Your prescriber and the leaflet inside your pen pack will confirm the recommended sites and technique for your specific medicine.
Yes. Rotating sites each week helps prevent a build-up of hardened tissue (lipohypertrophy) that can affect absorption. Vary both the body area and the exact spot within that area. Logging each injection makes rotation much easier to track consistently.
Speak to your prescriber or a registered pharmacy — they can advise on current availability and any options relevant to your situation. GLP Trackr does not sell or source medication. Your prescriber is best placed to guide any decisions about your treatment during a shortage.
That decision belongs with your prescriber, who will consider your full medical history and circumstances. Mounjaro contains tirzepatide (a dual GIP and GLP-1 receptor agonist) and Wegovy contains semaglutide (a GLP-1 receptor agonist). Both are prescription-only medicines.
GLP Trackr logs each injection — date, time, dose strength, and site — and suggests where to rotate next. It also sends dose reminders so you do not miss your weekly injection, and keeps a full record you can share with your prescriber.