Injection Sites and Why Rotation Matters
Both Mounjaro and Wegovy are given as subcutaneous injections — meaning they are delivered just beneath the skin rather than into muscle. The three areas most commonly used are the abdomen (at least a few centimetres away from the navel), the front of the thigh, and the upper arm. Your prescriber or doctor will confirm which sites are appropriate for you and explain the technique described in the patient information leaflet that comes with your pen.
Why rotating sites is important
Injecting repeatedly into exactly the same spot can cause localised changes in the tissue under the skin — a process sometimes called lipohypertrophy. These hardened patches can affect how the medicine is absorbed. Rotating across different sites, and moving within each area each week, helps keep the skin healthy and absorption consistent.
A practical rotation approach
- Keep a mental or written note of where you injected last week.
- Move to a different area or a different spot within the same area each time.
- Avoid skin that is bruised, tender, irritated, or has visible changes from previous injections.
- Always follow the specific guidance in your medicine leaflet and from your prescriber.
If you are researching the broader topic of weight loss injections, our guide covers how these medicines work and what to expect during treatment. You may also find it useful to read about how costs are structured around weight loss injections if you are already prescribed and thinking about planning ahead.
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 where you last injected — and making sure you rotate correctly — is one of those small but important habits that is easy to forget over a long treatment course. That is exactly where GLP Trackr is built to help.
The app's injection-site tracking feature lets you log each injection: the site you used (abdomen, thigh, or arm), the date, and the dose strength. Based on your history, GLP Trackr then suggests your next rotation site automatically, so you never have to rely on memory alone. Alongside site tracking, dose reminders mean your weekly schedule stays consistent — a once-weekly medicine is easy to lose track of across a busy month.
If you ever notice a reaction at an injection site — redness, swelling, or tenderness — you can log that too using the side-effect tracker, creating a clear record to bring to your next appointment and discuss with your prescriber or doctor.
GLP Trackr helps you record this information so you can have better, more informed conversations with your healthcare team — it is not a substitute for their clinical guidance. If you experience a reaction that is severe, spreads, or does not settle, contact your healthcare professional promptly. Any concerns about your injection technique or sites should always be directed to your prescriber or pharmacist, who can review the patient information leaflet alongside your individual history.
You can also explore our wider weight loss injections guide and, if cost is on your mind, information on finding well-priced weight loss injections as someone already on treatment.
Log your injection sites, track your rotation history, and let the app suggest what comes next. GLP Trackr is free to try — download it on the App Store or Google Play and start a 7-day free trial today.
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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.
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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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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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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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Frequently asked questions.
These medicines are given as subcutaneous injections — just beneath the skin. Common sites include the abdomen, front of the thigh, and upper arm. Your prescriber or doctor will confirm the appropriate sites for you and your medicine's patient information leaflet provides detailed guidance.
Yes. Rotating between sites and varying the exact spot within each area helps prevent localised tissue changes that can affect how the medicine is absorbed. Your prescriber or doctor can advise on a rotation approach that suits you.
Mild redness or tenderness at the injection site is commonly reported. If a reaction is severe, spreads, or does not settle, contact your healthcare professional promptly. You can log site reactions in GLP Trackr to share with your prescriber at your next appointment.
GLP Trackr lets you log each injection — site, date, and dose — and then suggests your next rotation site based on your history. This removes the need to rely on memory alone and helps you maintain a consistent rotation across your treatment.
Yes. The app includes dose reminders so your once-weekly injection schedule stays on track, even across a busy week. You can set the reminder to suit whatever day and time works best for you.