Mounjaro and Wegovy: A Factual Overview
Both Mounjaro and Wegovy are prescription-only, once-weekly injectable medicines used alongside diet and lifestyle changes. They are not interchangeable, and suitability for either is determined by a prescriber based on individual health history.
How they work
Wegovy contains semaglutide, a GLP-1 receptor agonist. It acts on appetite-regulating pathways in the brain, helping many people feel fuller sooner and reducing overall appetite — an effect sometimes described as quietening "food noise."
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. It acts on both the GLP-1 and GIP pathways simultaneously. Both medicines slow stomach emptying to some degree, which contributes to the sense of fullness many people experience.
How they are taken
Both are administered by subcutaneous injection once a week, using a pre-filled pen device. Common injection sites include the abdomen, thigh, and upper arm. Rotating between sites is generally recommended to reduce the chance of skin irritation at any one spot — your prescriber or the patient information leaflet that came with your pen will guide you on technique.
Dose stages
Both medicines are typically started at a lower dose and increased gradually over time, with adjustments made by the prescriber. The dose schedule is individual and should never be changed without speaking to your prescriber first.
For a broader look at how these medicines compare, see our overview of the best weight loss injections or explore the best weight loss injection options explained. You can also read more about comparing weight loss injections in our dedicated guide.
Both medicines carry a black triangle (▼) designation in some countries, meaning they are subject to additional monitoring. If you experience side effects, report them to your healthcare professional and your national reporting scheme (such as the UK's Yellow Card scheme).
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 Get the Most From Your Injection
Whichever medicine you have been prescribed, staying consistent with your weekly injection schedule is one of the most practical things you can do to support your treatment. GLP Trackr is built specifically for people already on Mounjaro or Wegovy, and the injection-site rotation feature is one of its most useful tools.
Injection-site tracking and rotation: Each time you inject, you log the site — abdomen, thigh, or upper arm — and GLP Trackr keeps a rotation history so it can suggest your next site automatically. Over weeks and months, this removes the guesswork and helps you avoid repeatedly using the same spot.
Dose logging and reminders: Every injection is recorded with the date, time, and dose strength, so you always have a clear record of where you are in your treatment. Gentle weekly reminders mean a dose is far less likely to be forgotten.
Doctor report: Your logged injection history, alongside weight, mood, and side-effect data, can be pulled into a summary to bring to your next prescriber appointment — a straightforward way to have a more informed conversation about how your treatment is going.
Any questions about your dose, which medicine is right for you, or whether to change anything about your treatment should always go to your prescriber or doctor. GLP Trackr records your journey and helps you spot patterns — it is a companion, not a clinical guide.
Head to our complete guide to weight loss injections for more on what to expect from your treatment.
Ready to take the guesswork out of site rotation and never miss a dose? GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and start logging your journey 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.
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.
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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.
Mounjaro (tirzepatide) and Wegovy (semaglutide) are the two most widely prescribed injectable medicines for weight management. Which is most suitable for any individual is a clinical decision — only your prescriber or doctor can determine the right option based on your health history.
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. Wegovy contains semaglutide, a GLP-1 receptor agonist. Both are once-weekly injections that act on appetite pathways, but they have different active substances and mechanisms. A prescriber can advise which is appropriate for you.
Rotating injection sites — between the abdomen, thigh, and upper arm — is generally recommended to avoid repeated irritation at one spot. Your patient information leaflet and prescriber can advise on the best approach for you. GLP Trackr can log and suggest your next rotation site automatically.
GLP Trackr logs each injection with the date, dose, and site, tracks your rotation history, and sends reminders so you never miss a dose. Your injection log can also be shared with your prescriber as part of a progress summary generated in the app.
Any decision to switch between Mounjaro and Wegovy — or to change your dose or treatment in any way — must be made with your prescriber or doctor. Never start, stop, or change your medication without speaking to your healthcare professional first.