How Prescribed Weight-Loss Injections Work
Mounjaro and Wegovy belong to a class of medicines that act on appetite-regulating pathways in the body. Wegovy contains semaglutide, a GLP-1 receptor agonist, while Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors. Both are delivered as once-weekly subcutaneous injections — meaning the medicine is injected into the fatty tissue just under the skin, rather than into a muscle or vein.
Common injection sites
The three areas most commonly used for subcutaneous injection are:
- Abdomen — the area around the stomach, avoiding the navel
- Upper thigh — the front or outer portion
- Upper arm — the outer, fleshy part
Each site has a slightly different absorption profile, though for most people the practical differences are modest. Your prescriber or doctor is the best person to advise on which site suits you individually.
Why rotation matters
Injecting into the same spot repeatedly can cause localised skin changes over time, such as hardening or sensitivity at the site. Rotating between different areas — and between different points within each area — helps keep the skin in good condition. Many people find a simple rotation pattern easier to maintain than trying to remember their last site from memory alone.
A note on other injection types sometimes searched
Searches for terms like "L-carnitine injection", "HCG injection", or "stem cell injection" for weight loss reflect a wide range of products and claims that sit outside the scope of this page. GLP Trackr is specifically built for people already prescribed Mounjaro or Wegovy. If you have questions about any other injectable product, your prescriber or doctor is the right person to speak to.
For a deeper look at Mounjaro specifically, see our guide on Mounjaro as an injection for weight loss, or read about tirzepatide injections for more on the active substance. If you were originally prescribed an injectable medicine for diabetes management, our page on diabetes injections used for weight loss may also be useful context.
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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Tracking Your Injections with GLP Trackr
Staying on top of a weekly injection schedule is straightforward in theory, but in practice it is easy to lose track — especially when you are also rotating sites and monitoring how you feel after each dose. GLP Trackr is built specifically for this.
Injection-site rotation, handled automatically
The app's injection-site tracker lets you log the site you used for each injection — abdomen, thigh, or upper arm — and records your full rotation history. Based on your log, it suggests your next site, so you never have to rely on memory to avoid repeating the same spot. Over time, you build a clear picture of your rotation pattern without any mental load.
Dose logging and reminders
Every injection can be logged with the date, time, and dose strength, keeping a complete record you can refer back to at any point. Gentle weekly reminders mean a dose is less likely to slip your mind during a busy week. If you do miss a dose, log it in the app and bring it to your next conversation with your prescriber — they are the right person to advise on what to do next, not the app.
You can explore the broader picture of weight-loss injections in our main hub, or find out more about daily injection options if your prescriber has discussed a different schedule with you.
A note on safety: GLP Trackr records your journey to help you stay consistent and have informed conversations with your prescriber — it is not a substitute for their guidance. If you experience any injection-site reactions that are severe, persistent, or worrying, contact your healthcare professional promptly. Any decision about your dose or injection schedule should be made with your prescriber.
Ready to take the guesswork out of your weekly injection routine? Download GLP Trackr on the App Store or Google Play and try it free for 7 days — your injection log and rotation reminders are waiting.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
Everything your GLP-1 journey needs. Free to try for 7 days.
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 Most Advanced GLP-1 Brain Ever Built.
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.
Mounjaro and Wegovy are subcutaneous injections, typically administered into the abdomen, upper thigh, or outer upper arm. Your prescriber or doctor will advise on the most suitable site for you and demonstrate the correct technique.
Rotating injection sites helps prevent localised skin changes — such as hardening or tenderness — that can develop from repeated injections in the same spot. Moving between different areas and positions within each area keeps the skin in good condition over time.
Do not make a dose decision on your own. Log the missed dose in GLP Trackr and discuss it with your prescriber or doctor at your earliest opportunity. They will advise you on the right course of action based on your individual circumstances.
Various injectable products are associated with weight management, including older approaches. GLP Trackr is designed specifically for people prescribed Mounjaro or Wegovy. For questions about other injectable options, speak with your prescriber or doctor.
GLP Trackr logs each injection with date, time, dose, and site. It tracks your rotation history and suggests your next site automatically. Weekly reminders help you stay on schedule, and your full injection log is available to share at prescriber appointments.