How Prescription Weight Loss Injections Work — and Why Injection Technique Matters
Mounjaro and Wegovy are both delivered via pre-filled injection pens, administered once a week into the fatty tissue just beneath the skin. According to the electronic Medicines Compendium (eMC), the three recommended sites are the abdomen, front of the thigh, and upper arm — all areas with enough subcutaneous tissue to receive the injection comfortably.
Why Rotating Your Injection Site Is Important
Using exactly the same spot week after week can lead to localised skin changes, which may affect how well the medicine is absorbed. Rotating between sites — and moving to a different area within the same site — helps keep the skin healthy over a long treatment course. Your prescriber or doctor will advise you on technique; always refer to the patient information leaflet (PIL) that came with your pen for the full instructions.
Commonly Reported Injection-Site Reactions
Mild redness, itching, or swelling at the injection site is commonly reported and usually settles on its own. If a reaction is persistent, spreading, or causes significant discomfort, contact your healthcare professional rather than managing it alone.
For a broader overview of how these medicines are taken, see our guide to weight loss injections. You may also find it helpful to read about GLP-1 injection weight loss and how these medicines act on appetite-regulating pathways.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Your Injection Sites and Doses with GLP Trackr
Keeping a reliable record of where and when you inject is one of the most practical things you can do to support your treatment — and GLP Trackr is built around exactly that.
The app's injection-site tracking and rotation feature lets you log each injection site after every dose. GLP Trackr records your rotation history and suggests your next site automatically, so you never have to rely on memory to avoid repeating the same spot. Alongside that, the dose logging feature lets you record the dose strength, date, and time of every injection in one place — useful for your own records and easy to share with your prescriber at appointments. You can also set a weekly dose reminder so a missed injection becomes far less likely.
Whichever medicine has been prescribed to you, logging this information consistently turns a once-weekly habit into a clearly documented journey you can look back on and discuss with your healthcare team.
If you are looking for more on specific injection approaches, our pages on Mounjaro injection weight loss and injection weight loss go into further detail.
A note on safety: always follow the guidance of your prescriber or doctor — they know your full medical history and can advise on technique, site reactions, and anything that concerns you. If you notice a reaction that seems unusual or worsening, contact your healthcare professional promptly. GLP Trackr helps you record what is happening so you can discuss it with them; it is not a substitute for their advice.
Ready to take the guesswork out of injection rotation? Download GLP Trackr on the App Store or Google Play and start your free 7-day trial — every injection logged, every site remembered.
What does glptrackr include?
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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.
Hydration Reminders
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.
Smart Meal Planning
Personalized meal plans built around your current dose phase and side effects. Every meal is GLP-1 optimized — high in protein, gentle on the stomach, and scaled to your reduced appetite.
Recipe Library
Browse 50+ high-protein, GLP-1-friendly recipes filtered by meal type, prep time, and dietary needs. Every recipe includes full nutrition info, step-by-step instructions, and tips for eating with side effects.
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.
AI Meal Scanning
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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Log your Mounjaro or Wegovy injection in seconds. Track your pen, your dose level, and your injection site — so you always know exactly where you are in your treatment.
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Log your weight, measurements, and how you're feeling after each dose. GLPTrackr turns your data into clear, motivating charts that show you how far you've really come.
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Predicts Before You Feel It
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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GLPIQ analyses every dose you've been on: weight loss rate, side effects, food noise, mood, protein adherence and tells you which dose gave you the best results. No other app does this.
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Frequently asked questions.
These once-weekly injectable medicines are typically given into the fatty tissue under the skin of the abdomen, front of the thigh, or upper arm. Your prescriber or doctor and the patient information leaflet that came with your pen will guide you on the correct technique for your situation.
Yes — rotating between sites and within the same site each week helps protect the skin and supports consistent absorption. Using the same spot repeatedly can cause localised skin changes over time. Your prescriber can advise on a rotation pattern that works for you.
Mild redness, itching, or slight swelling at the injection site is commonly reported and usually clears on its own. If a reaction persists, spreads, or feels more significant, contact your healthcare professional rather than waiting to see if it resolves.
GLP Trackr's injection-site tracking feature logs each site you use and suggests your next one automatically based on your rotation history, so you do not have to rely on memory between weekly doses.
GLP Trackr lets you log the date and time of each injection as you give it, and sends a weekly reminder so you stay on schedule. Any questions about timing or missed doses should be discussed with your prescriber or doctor, who can advise based on your specific medicine and circumstances.