How Weight Loss Injections for Obesity Work and Where They Are Given
Mounjaro and Wegovy are both prescription-only, once-weekly injectable medicines used as part of an obesity management programme under clinical supervision. Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist, while Wegovy contains semaglutide, a GLP-1 receptor agonist. Both act on appetite-regulating pathways, and many people report a reduced sense of hunger and increased fullness — though individual experience varies.
Injection sites
Both medicines are injected subcutaneously (just beneath the skin). The three areas most commonly used are the abdomen, the front of the thigh, and the upper arm. Your prescriber or the patient information leaflet that came with your pen will guide you on the exact technique; GLP Trackr does not replace that guidance.
Why injection-site rotation matters
Repeatedly injecting into the same spot can cause skin changes such as localised thickening or tenderness over time. Rotating between sites — and within each site — helps keep the tissue healthy and may support more consistent absorption. Keeping a simple log of which site you used last makes rotation straightforward rather than something you have to remember.
For a broader look at the injection options available, see our guide to weight loss injections. If you are curious about how these medicines are typically used by men specifically, our page on weight loss injection considerations for men covers relevant factors.
Any questions about your specific injection technique, dose, or schedule should be directed to your prescriber or doctor — they have the full picture of your health history.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Your Injections and Progress with GLP Trackr
Staying consistent with a weekly injection is easier when you have a clear record of every dose you have taken. GLP Trackr's injection-site tracking feature lets you log each dose alongside the site you used — abdomen, thigh, or arm — and the app keeps a rotation history so it can suggest your next site automatically. That removes the guesswork and helps you avoid over-using any single area.
Alongside site tracking, dose reminders mean you are less likely to lose track of where you are in your weekly schedule. And because obesity management is about more than the injection itself, GLP Trackr also logs your weight, mood, energy and side effects so you can see your whole journey in one place — useful information to bring to your next prescriber appointment.
If you have ever wondered about the cost side of treatment, our page on weight loss injection pricing factors explores what influences cost without quoting figures.
GLP Trackr is a tracking and journaling companion — it does not provide medical advice or replace your prescriber's guidance. If you experience any symptoms that feel severe, persistent, or concerning, contact your healthcare professional promptly. Any decision about your dose or treatment plan belongs with your prescriber, not with an app.
Ready to take the guesswork out of injection-site rotation and keep your weekly schedule on track? GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and start logging today.
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.
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.
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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.
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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.
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.
The two main prescription weight loss injections used for obesity management are Mounjaro (tirzepatide) and Wegovy (semaglutide). Both are once-weekly subcutaneous injections prescribed alongside diet and lifestyle changes. Suitability is determined by a prescriber based on your individual health history.
Weight loss injections like Mounjaro and Wegovy are typically given into the abdomen, front of the thigh, or upper arm. Your prescriber or the patient information leaflet supplied with your pen will advise on technique. Rotating sites each week helps keep skin tissue healthy.
Injecting repeatedly into the same spot can cause localised skin changes such as thickening or tenderness, which may affect how the medicine is absorbed. Rotating between different areas and within each area helps maintain healthy tissue. Logging each site makes rotation easy to keep track of.
GLP Trackr lets you log each injection — including dose strength, date, and the site used. The app tracks your rotation history and suggests your next injection site automatically. Dose reminders help ensure you stay on your weekly schedule without having to rely on memory alone.
Any concerns about your dose, side effects, or suitability should be discussed with your prescriber or doctor — they are best placed to advise based on your full medical history. If a symptom feels severe or persistent, contact a healthcare professional promptly rather than waiting for your next appointment.