How Wegovy and Mounjaro Differ: The Key Facts
The most fundamental difference between the two medicines lies in their active substances and how they act on the body.
Wegovy (semaglutide)
Wegovy contains semaglutide, a GLP-1 receptor agonist. It works by mimicking the GLP-1 hormone, which plays a role in regulating appetite and feelings of fullness. It is administered as a once-weekly injection using a pre-filled pen, with dose strengths typically ranging from 0.25 mg up to 2.4 mg, introduced gradually under prescriber guidance.
Mounjaro (tirzepatide)
Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors — making it a dual-agonist. GIP (glucose-dependent insulinotropic polypeptide) is a second appetite-regulating hormone pathway. Like Wegovy, Mounjaro is a once-weekly injectable medicine supplied in pre-filled pens, with dose strengths commonly ranging from 2.5 mg to 15 mg, again titrated by the prescriber over time.
What they have in common
- Both are prescription-only medicines — neither can be obtained without a valid prescription from a qualified prescriber
- Both are given as once-weekly subcutaneous injections
- Both act on appetite-regulating pathways and are commonly associated with reduced food noise and increased feelings of fullness
- Both carry a black triangle (▼) status in the UK, meaning side effects should be reported to your national pharmacovigilance scheme (such as the UK Yellow Card scheme) and to your healthcare professional
- Neither is a substitute for dietary changes, physical activity, and ongoing clinical support
For a deeper look at how these two medicines compare, see our full Wegovy vs Mounjaro comparison guide, or explore the key differences between Wegovy and Mounjaro in more detail.
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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Whichever You're On, GLP Trackr Tracks It
GLP Trackr is built to support people already prescribed either Mounjaro or Wegovy — the app works for both medicines, at every dose stage of the journey.
Because both medicines involve a weekly injection schedule with dose titration over time, keeping an accurate log matters. The dose and injection logging feature lets you record each shot — including the dose strength, date, and injection site — so you always have a clear picture of where you are in your treatment. The app also tracks injection-site rotation, suggesting your next site so you are not returning to the same spot too soon.
Beyond injections, the side-effect tracker lets you note symptoms like nausea, fatigue, or digestive changes and see how they shift over time — useful information to bring to your next prescriber appointment. The built-in doctor report feature helps you summarise your journey clearly.
The choice between Wegovy and Mounjaro — or any question about switching — belongs entirely with your prescriber or doctor. GLP Trackr does not offer medical advice; it gives you the tracking tools to stay consistent and have more informed conversations with your healthcare team.
You can also read more about what the difference between Wegovy and Mounjaro means in practice, or browse further detail on Wegovy and Mounjaro differences across our comparison pages.
If you are already prescribed either medicine, GLP Trackr is free to try for 7 days — available on the App Store and Google Play. Log your doses, track how you feel, and watch your progress take shape.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
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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.
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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.
Wegovy contains semaglutide, a GLP-1 receptor agonist, while Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors. Both are prescription-only, once-weekly injectable medicines used in weight management, but their active substances and mechanisms differ.
That is a decision for your prescriber or doctor, based on your individual health history and circumstances. A comparison article cannot determine which medicine is more suitable for you. Always follow the guidance of your healthcare professional.
Any decision to switch, start, or stop a prescription medicine should be made with your prescriber or doctor — never on your own. If you have questions about your current treatment, raise them at your next appointment or contact your healthcare professional directly.
Yes. GLP Trackr is designed for people already prescribed either Mounjaro (tirzepatide) or Wegovy (semaglutide). You can log doses, track injection sites, monitor side effects, and record your progress whichever medicine you are on.
They are both prescription-only, once-weekly injectable medicines used in weight management, but they are not the same. Wegovy is a GLP-1 receptor agonist (semaglutide); Mounjaro is a dual GIP and GLP-1 receptor agonist (tirzepatide) — a different active substance with an additional mechanism.