How These Once-Weekly Injections Work in Practice
Mounjaro and Wegovy are both administered as a subcutaneous (under-the-skin) injection, typically once per week. Mounjaro's active substance is tirzepatide, a dual GIP and GLP-1 receptor agonist, while Wegovy's active substance is semaglutide, a GLP-1 receptor agonist. Both act on appetite-regulating pathways, and many people report a reduced sense of hunger and increased fullness after eating — though individual experience varies.
Injection Sites and Rotation
The three sites most commonly used are the abdomen (stomach area), the front of the thigh, and the upper arm. Rotating between sites — rather than injecting into the same spot each week — is widely recommended because repeated injections in one area can affect the skin over time. Your prescriber or the patient information leaflet supplied with your pen will give you the specific guidance relevant to your medicine.
If you want a broader overview of how these injections are used in weight management, the weight loss injections guide covers the full picture. You may also find it useful to read about Mounjaro as a weight loss jab if that is the medicine you have been prescribed.
Pen Handling
Both medicines come as pre-filled pens designed for single weekly use. Storage requirements vary by product — always check the leaflet that came with your pen or the electronic Medicines Compendium (eMC) entry for your specific medicine for guidance on refrigeration and in-use shelf life, rather than relying on a general figure. If you are ever unsure whether a pen has been stored correctly, contact your pharmacist or prescriber before using it.
It is also worth knowing that supply can occasionally be affected by demand — if this concerns you, the page on weight loss jab shortages has relevant information.
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 Weekly Jab
One of the most practical things GLP Trackr does is take the guesswork out of injection-site rotation. Each time you log a shot — recording the site, dose strength, date, and time — the app tracks your rotation history and suggests where to inject next. Over weeks and months, that builds into a clear record you can refer to or share with your prescriber.
Alongside site tracking, the app sends gentle dose reminders so your weekly schedule stays consistent. Missing a dose by accident is easy when life is busy; a timely prompt removes that friction. If you are curious about how that fits into the wider picture of your treatment, exploring the best jab for weight loss page may be a helpful read alongside your prescriber's guidance.
You can also log any side effects you notice after each injection — things like injection-site reactions, nausea, or fatigue — and review them over time. That kind of pattern data can be genuinely useful to bring to an appointment.
Always follow the specific guidance your prescriber has given you about how and where to inject. If you experience anything at an injection site that seems unusual — persistent redness, swelling, or lumps — contact your healthcare professional promptly rather than waiting. GLP Trackr is a tracking companion; it is not a substitute for clinical advice.
Start logging your injections with automatic site-rotation suggestions — GLP Trackr is free to try for 7 days on the App Store and Google Play.
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.
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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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 injected subcutaneously — under the skin — into the abdomen, front of the thigh, or upper arm. Your prescriber or the patient information leaflet supplied with your pen will confirm the exact guidance for your medicine.
Yes, rotating injection sites is widely recommended. Using the same spot repeatedly can affect the skin over time. Common practice is to alternate between the abdomen, thigh, and upper arm, and to vary the exact spot within each area each week.
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are once-weekly injectable medicines. The exact day is typically consistent each week, but any questions about your personal schedule should be directed to your prescriber.
GLP Trackr lets you log each injection — site, dose, date and time — and suggests your next rotation site automatically. It also sends dose reminders and builds a record you can discuss with your prescriber at appointments.
Mild redness or tenderness after an injection is commonly reported, but if you notice persistent swelling, lumps, or anything that concerns you, contact your healthcare professional promptly. Do not rely on an app or general information to assess injection-site reactions.