How Weight-Loss Injections Work and Where They Are Given
Mounjaro and Wegovy are both given as a once-weekly subcutaneous injection — meaning they are delivered into the fatty tissue just under the skin, not into a muscle or vein. According to the electronic Medicines Compendium (eMC) product information, the three recommended injection sites are the abdomen (stomach area), the front of the thigh, and the upper arm.
Why Rotating Your Injection Site Matters
Staying in the same spot repeatedly can lead to changes in the skin and underlying tissue over time, which may affect how the medicine is absorbed. Rotating between sites — and moving to a different spot within each area for each injection — helps keep tissue healthy and absorption consistent. Your prescriber or doctor should advise you on the specifics during your consultation, and the patient information leaflet that came with your pen is always your primary reference.
How These Medicines Act on Appetite
Mounjaro acts on both GIP and GLP-1 receptors, while Wegovy acts on GLP-1 receptors. Both are commonly described as increasing feelings of fullness and reducing appetite — an effect sometimes called lowering "food noise". Slower stomach emptying is also commonly reported, particularly in the earlier weeks of treatment. These are prescription medicines whose suitability and dosing are decided entirely by your prescriber, not by a tracking app or general information.
Curious about how B12 compares? Read our page on whether B12 injections can help with weight loss for a factual overview. For a broader look at what these medicines involve, visit our weight-loss injections guide.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
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How GLP Trackr Helps You Stay on Top of Your Injections
Keeping track of which site you last used — and remembering which area is due next — is one of those small tasks that is easy to overlook on a weekly schedule. GLP Trackr's injection-site tracking logs each injection (site, dose strength, and date) and suggests your next rotation automatically, so you never have to guess or try to remember.
Beyond site rotation, the app's dose reminder feature means your weekly injection is harder to forget — a gentle nudge on the day you are due keeps your schedule on track without any mental load. And if you want to keep a record to share with your prescriber — for example, noting a site reaction or a dose you found harder to tolerate — the side-effect log lets you capture that in the same place.
If you are curious about the cost side of your treatment, our page on weight-loss injection prices covers what people typically consider, without quoting figures that change constantly.
GLP Trackr is built specifically for people on Mounjaro and Wegovy — log your shots, track your rotation, and keep everything in one place. It is free to try for 7 days on the App Store and Google Play.
A note on safety: any concerns about your injection technique, site reactions, or how your body is responding to treatment should be discussed with your prescriber or doctor — they know your full history and are best placed to advise you. GLP Trackr helps you record what is happening so you have something useful to bring to that conversation; it is not a substitute for clinical guidance.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
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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.
Exercise & Steps
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.
Community Support
Connect with thousands of others navigating the same medication journey. Share milestones, ask questions, find accountability partners, and get support from people who truly understand.
Never Forget a Dose Again.
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.
Watch Your Body Transform, Week by Week.
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.
You're Not on This Journey Alone.
Connect with thousands of real GLP-1 users sharing their wins, side effect tips, and meal ideas. Get the support of people who truly get it — because they're living it too.
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The first AI built exclusively for GLP-1 weight loss. Every insight, every meal plan, every prediction trained on one thing only: helping you get the most out of your medication.
Knows Your Cycle
GLPIQ tracks where you are in your injection cycle and adjusts everything around it: lighter meals on nausea days, higher protein when appetite returns, and smarter targets as your medication level shifts.
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.
Finds Your Golden Dose
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.
Both Mounjaro and Wegovy are given as once-weekly subcutaneous injections into the abdomen, front of the thigh, or upper arm. Your prescriber or doctor and the patient information leaflet that came with your pen are the best guides for your specific medicine and situation.
Yes — rotating sites is generally recommended to help maintain healthy skin and consistent absorption. This means using a different spot within the same area, as well as alternating between areas over time. Your prescriber can advise on the best rotation approach for you.
GLP Trackr is a companion app built for people already on Mounjaro or Wegovy. It logs each injection, tracks site rotation, and sends dose reminders. It is available free on the App Store and Google Play, with a 7-day trial, but does not replace medical advice.
GLP Trackr offers a free 7-day trial on the App Store and Google Play. It is designed specifically for people on GLP-1 medicines like Mounjaro and Wegovy, covering injection tracking, food logging, weight progress, and side-effect logging in one place.
Mild redness or discomfort at the injection site is commonly reported. If a reaction is severe, spreading, or persists, contact your healthcare professional promptly. You can log site reactions in GLP Trackr to keep a record and share it with your prescriber at your next appointment.