How Ozempic and Mounjaro Differ: Active Substances and Mechanisms
The most fundamental difference between the two medicines lies in their active ingredients and how they interact with the body's appetite-regulating systems.
Ozempic (semaglutide)
Ozempic's active substance is semaglutide, a GLP-1 receptor agonist. GLP-1 (glucagon-like peptide-1) is a hormone involved in regulating appetite and blood sugar. By mimicking this hormone, semaglutide is commonly reported to reduce appetite and increase feelings of fullness after eating. It is a prescription-only, once-weekly injection supplied as a pre-filled pen. Note that Wegovy is another brand of semaglutide used specifically for weight management — these are separate licensed products, though they share the same active substance.
Mounjaro (tirzepatide)
Mounjaro's active substance is tirzepatide, which is a dual GIP and GLP-1 receptor agonist. In addition to the GLP-1 pathway that semaglutide targets, tirzepatide also acts on the GIP (glucose-dependent insulinotropic polypeptide) receptor. Mounjaro is also a prescription-only, once-weekly injection. It carries a black triangle (▼) designation in the UK, meaning it is subject to additional monitoring; any suspected side effects should be reported to your national reporting scheme (such as the UK's Yellow Card scheme) and discussed with your healthcare professional.
A note on naming
People sometimes use "Ozempic" loosely to refer to any GLP-1 weight-loss injection, but this is not accurate. Ozempic, Wegovy, and Mounjaro are distinct licensed products. For a closer look at how the two are sometimes confused, see our page on Ozempic and Mounjaro compared, or explore whether Ozempic and Mounjaro are the same medicine for a direct answer to that question.
Both medicines are prescription-only and not suitable for everyone. Suitability, dosing, and any changes to treatment are decisions made by a prescriber based on an individual's full medical history — always follow their guidance.
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.
AI Meal Tracking. Built for GLP 1 Appetites.
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Tracking Whichever Medicine You Are Prescribed with GLP Trackr
GLP Trackr is built for people already on Mounjaro or semaglutide-based medicines like Wegovy, and it supports both equally. Whichever medicine has been prescribed to you, the experience of managing a weekly injection schedule, navigating side effects, and monitoring progress is broadly similar — and that is exactly what the app is designed to help with.
The most immediately useful feature for anyone on either medicine is dose and injection logging: recording each shot's date, dose strength, and site in one place so nothing slips through the gaps in a weekly routine. From there, the side-effect tracker lets you log symptoms like nausea or fatigue and see patterns over time — genuinely useful context to bring to a prescriber appointment. If you are curious about how other medicines might interact with your treatment, our page on codeine and Mounjaro interactions is one example of the kind of questions the app can help you track and discuss with your doctor.
For a broader guide to Mounjaro specifically, the Mounjaro overview covers what people on tirzepatide commonly want to know.
Any question about which medicine is right for you, or whether to switch, belongs with your prescriber — GLP Trackr helps you track and record your journey, but it is not a substitute for clinical advice.
Ready to stay on top of your weekly shots and understand your own patterns? GLP Trackr is free to try for 7 days — available on the App Store and Google Play.
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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.
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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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Frequently asked questions.
Ozempic contains semaglutide, a GLP-1 receptor agonist. Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors. Both are prescription-only, once-weekly injectables, but they have different active substances and distinct mechanisms of action.
No. They share some similarities — both are weekly injectables that act on appetite-regulating pathways — but they contain different active substances (semaglutide vs tirzepatide) and are separate licensed products with different mechanisms.
That is a decision for your prescriber or doctor, based on your individual health history and circumstances. Neither medicine is universally "better" — suitability varies from person to person, and only a qualified clinician can advise on which is appropriate for you.
Both Wegovy and Ozempic contain semaglutide, but they are separate licensed products with different approved indications and dose regimens. Your prescriber or doctor can explain which product has been prescribed to you and why.
Yes. GLP Trackr supports people on both tirzepatide (Mounjaro) and semaglutide-based medicines. You can log doses, injection sites, side effects, weight, and food regardless of which medicine you have been prescribed.