Mounjaro and Wegovy: What the Difference Actually Is
Both medicines are prescription-only, once-weekly injectables — but they work on slightly different pathways. Wegovy contains semaglutide, a GLP-1 receptor agonist that acts on appetite-regulating signals in the brain and slows gastric emptying. Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors, making it a dual receptor agonist. Neither is insulin, and neither is a cosmetic quick fix — both are used alongside changes to diet and activity, under clinical supervision.
Because the mechanism differs, so can the experience. Many people report reduced appetite and a quieter relationship with food on both medicines, though individual responses vary considerably. Suitability, tolerability, and which option a prescriber recommends depend on a person's full medical picture — something no comparison article can assess for you.
For a factual side-by-side of how these medicines compare, see our overview of the main slimming injections. If you are researching injection sites and how to rotate them, our guide to slimming injection technique and site care covers what many people want to know once they are already injecting. You can also explore which weight loss injection suits different situations for more detail on how prescribers approach this question.
Both Mounjaro and Wegovy carry a black triangle (▼) symbol in the UK, meaning they are subject to additional monitoring. Any side effects should be reported to your healthcare professional and to 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 Supports You — Whichever Injection You Are On
GLP Trackr is built for people already prescribed Mounjaro or Wegovy, and it supports both medicines equally. The most immediately useful feature for injection users is injection-site tracking and rotation: each time you inject, you log the site — abdomen, thigh, or upper arm — and the app keeps a rotation history so it can suggest where to inject next. Rotating sites consistently is something most prescribers recommend, and having that record in one place makes it easy to follow without having to remember.
Alongside site tracking, the app logs your dose strength and injection date so you always have a clear record of where you are in your treatment schedule. Gentle dose reminders mean a weekly injection is far less likely to be forgotten — particularly useful when life gets busy and your injection day could easily slip past unnoticed.
All of this sits within the broader weight loss injections tracking hub, where you can explore how the app supports the wider journey — from food and weight logging to side-effect patterns and progress insights.
If you have questions about which medicine is right for you, or about your injection schedule, always follow the guidance of your prescriber or doctor — they know your full history and are the right person to advise on suitability and dosing.
Ready to keep a clear record of every injection, site, and dose? GLP Trackr is free to start on the App Store and Google Play, with a 7-day trial so you can see how it fits into your routine before committing.
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.
There is no universally "best" slimming injection. Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are commonly prescribed once-weekly injectables used in weight management. Which is appropriate for any individual is a clinical decision made by their prescriber, based on personal health history.
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. Wegovy contains semaglutide, a GLP-1 receptor agonist. Both are prescription-only, once-weekly injectables. The right option for any person depends on their medical history and their prescriber's recommendation.
That decision belongs with your prescriber or doctor, not a comparison article. They will consider your health history, any existing conditions, and your individual circumstances before recommending the most appropriate option.
Yes. GLP Trackr supports people on both Mounjaro and Wegovy. You can log your injection site, dose strength, and injection date, and the app tracks your rotation history to suggest your next site — whichever medicine you are prescribed.
Rotating injection sites — between abdomen, thigh, and upper arm — helps avoid skin changes at any single location. Most prescribers recommend consistent rotation. GLP Trackr logs each site and tracks your history so the app can suggest where to inject next.