How Mounjaro and Semaglutide Differ: The Key Facts
Both medicines belong to a class that acts on appetite-regulating pathways in the body, but their mechanisms are distinct.
Active substances and receptor targets
- Mounjaro contains tirzepatide, a dual agonist that activates both GIP (glucose-dependent insulinotropic polypeptide) and GLP-1 (glucagon-like peptide-1) receptors.
- Semaglutide — the active substance in Wegovy (for weight management) and Ozempic (for type 2 diabetes) — acts on GLP-1 receptors only.
In plain terms: tirzepatide targets two pathways; semaglutide targets one. Whether that translates into a meaningful difference for any particular person is something only a prescriber can assess based on individual history and circumstances.
How they are taken
Both are administered as a subcutaneous (under-the-skin) injection once a week, using a pre-filled pen device. Both are typically started at a lower dose and adjusted over time, with the pace and extent of any change decided by the prescriber — not the patient.
What about other medicines people compare?
Searches often group tirzepatide alongside other treatments. For context: Saxenda contains liraglutide, a different GLP-1 agonist given as a daily rather than weekly injection. Orlistat works through an entirely different mechanism — it reduces fat absorption in the gut rather than acting on appetite pathways. Retatrutide is a triple-receptor agonist (GIP, GLP-1, and glucagon) that, at the time of writing, is still in clinical development and not an approved prescription medicine. These are meaningfully different treatments, and any switch or comparison between them is strictly a matter for a qualified prescriber.
Spotting counterfeit product
Concerns about counterfeit or falsified versions of weight-management injectables are real and well-documented. If you have any doubt about whether a pen you have received is genuine, do not use it — contact your prescriber or the pharmacy that supplied it immediately. Genuine medicines are supplied through regulated, registered pharmacies and come with verifiable packaging, batch numbers, and patient information leaflets. Report any suspected counterfeit product to your national regulatory authority or reporting scheme (such as the UK's Yellow Card scheme, for those in the UK).
For a deeper side-by-side look at the two most commonly compared medicines, see our Mounjaro vs Wegovy comparison, and for detail on how tirzepatide compares with Ozempic specifically, our Mounjaro vs Ozempic overview covers the key distinctions. If you are curious about how different dose stages of Mounjaro relate to each other, the 2.5 mg vs 5 mg Mounjaro guide explains what the titration steps involve.
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 Medicine You're On, GLP Trackr Tracks It
GLP Trackr is built for people already prescribed either tirzepatide or semaglutide — it supports both medicines equally, so whichever your prescriber has chosen for you, the app works the same way.
The most useful starting point for most users is dose and injection logging: every shot is recorded with its date, dose strength, and injection site, so you always have a clear, timestamped record of your treatment. Over time, this log becomes genuinely useful — you can see your titration history at a glance and bring an accurate summary to your next prescriber appointment rather than relying on memory.
The app also tracks side effects and symptoms over time, letting you spot patterns — for example, whether certain injection sites or days of the week correlate with how you feel. And the insights and analytics tools bring your dose history, weight data, and wellbeing check-ins together so you can see your journey as a whole, not just individual data points.
GLP Trackr is a tracking and journaling tool — it does not provide medical or dosing advice, and it is not a substitute for your prescriber's guidance. Any questions about which medicine is appropriate for you, or about changing your treatment, should always go to your healthcare professional.
Our broader Wegovy vs Mounjaro hub brings together more detailed information on both medicines for people navigating this comparison.
Whatever you're prescribed, keeping a consistent record makes every conversation with your prescriber more informed. GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and start logging your journey today.
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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.
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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.
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Frequently asked questions.
Mounjaro contains tirzepatide, which activates both GIP and GLP-1 receptors. Semaglutide (found in Wegovy and Ozempic) activates GLP-1 receptors only. Both are prescription-only, once-weekly injectables used in weight management, but they have distinct mechanisms.
That is a clinical question only your prescriber can answer based on your individual health history. Neither medicine is universally 'better'; suitability depends on personal circumstances, other conditions, and your prescriber's assessment. GLP Trackr does not recommend one over the other.
Saxenda contains liraglutide, a GLP-1 agonist given daily rather than weekly. Orlistat works differently — it reduces fat absorption in the gut rather than acting on appetite pathways. These are distinct treatments; any comparison or switch should be discussed with your prescriber.
Genuine medicines are supplied by regulated, registered pharmacies and include verifiable packaging, batch numbers, and a patient information leaflet. If you have any doubt, do not use the pen — contact your prescriber or supplying pharmacy immediately and report concerns to your national regulatory authority.
Yes. GLP Trackr supports people prescribed either medicine. You can log doses, injection sites, side effects, weight, and more, whichever treatment you are on. The app tracks your journey — it does not provide medical or dosing advice.