How Mounjaro and Wegovy Differ: The Key Facts
Mounjaro and Wegovy work through related but distinct mechanisms, and understanding the difference is useful context for any conversation with your prescriber.
Active substances and how they act
- Wegovy (semaglutide) is a GLP-1 receptor agonist. It mimics the GLP-1 hormone, which plays a role in regulating appetite and feelings of fullness, and slows gastric emptying.
- Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist. It acts on both the GIP and GLP-1 pathways simultaneously — a mechanism that is distinct from semaglutide-only medicines.
How they are taken
Both are injected once weekly using a pre-filled pen. Both are typically started at a lower dose and adjusted over time — always under the direction of the prescriber, never independently. The available dose strengths differ between the two medicines; your prescriber and the patient information leaflet supplied with your pen are the right sources for specifics.
What the evidence shows — and its limits
Clinical trial data for both medicines has been widely discussed. Trials for tirzepatide (the SURMOUNT programme) and semaglutide (the STEP programme) each demonstrated statistically significant average weight reductions compared to placebo. Some comparative analyses suggest tirzepatide produced larger average reductions in trial populations, but average trial results do not predict individual response. Factors including starting weight, other health conditions, tolerability, and consistent use all influence real-world outcomes. For a balanced overview of both medicines, the NHS publishes factual guidance on each.
For a broader side-by-side look at these two medicines, see our Mounjaro and Wegovy comparison guide, or explore the question of choosing between Mounjaro or Wegovy with your prescriber in mind. If you are also considering how the two medicines compare in terms of tolerability, our page on which has more side effects — Mounjaro or Wegovy covers what is commonly reported.
The bottom line: which medicine is more effective for a given individual depends on that person's circumstances. This is not a decision to make alone — it belongs with your prescriber.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Whichever You Are On, GLP Trackr Tracks Your Journey
GLP Trackr is built for people already taking Mounjaro or Wegovy — and it supports both medicines equally. The app does not tell you which to take; it helps you get the most from whichever one your prescriber has chosen for you.
See your own results clearly
One of the most meaningful ways to understand how well your treatment is working is to track the full picture over time — not just the number on the scale, but energy, mood, appetite, food intake, and side effects together. GLP Trackr's weight and progress tracking lets you log your weight and measurements and watch trends develop week by week. The insights and analytics features surface patterns in your own data — including a plateau forecast and correlation explorer — so you have something concrete to bring to your prescriber appointments.
Track side effects alongside your results
Both medicines share some commonly reported side effects, and logging them over time helps you spot whether symptoms are improving or persisting. GLP Trackr's side-effect tracker lets you record how you feel after each dose and review patterns across weeks — useful information to share with your healthcare professional.
You can also explore the topic of Ozempic versus Wegovy if semaglutide options are part of your conversation with your prescriber.
Any decision about which medicine is right for you — or whether to switch — should always be made with your prescriber, never on your own. GLP Trackr helps you record your journey; it is not a substitute for clinical guidance.
Ready to see your progress clearly, whichever medicine you are on? GLP Trackr is available free on the App Store and Google Play — start your 7-day trial and bring better data to every prescriber conversation.
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.
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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.
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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.
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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.
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Frequently asked questions.
Clinical trials showed both medicines produced significant average weight reductions compared to placebo. Some analyses suggest tirzepatide (Mounjaro) produced larger average results in trials, but individual response varies widely. Your prescriber is the right person to discuss which medicine suits your specific situation.
Wegovy contains semaglutide, a GLP-1 receptor agonist. Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors. Both are once-weekly injections prescribed for weight management, but their mechanisms, dose strengths, and individual suitability differ.
Neither medicine is universally better. The right choice depends on your health history, tolerability, and other factors only your prescriber can assess. Content comparing the two can inform your conversation, but the decision belongs with your healthcare professional.
Any change to your prescribed medicine — including switching between Wegovy and Mounjaro — must be discussed with and directed by your prescriber. Never stop, start, or change medication without their guidance.
Yes. GLP Trackr supports people on both Mounjaro and Wegovy. You can log doses, track weight and side effects, and monitor your progress whichever medicine you have been prescribed.