How Mounjaro and Ozempic Differ: Active Substances, Mechanisms and Formulations
Both medicines belong to the broader class of GLP-1 receptor agonists, but their pharmacological profiles differ in one important way.
Active substances
- Mounjaro contains tirzepatide, a dual GIP (glucose-dependent insulinotropic polypeptide) and GLP-1 receptor agonist. By acting on both pathways, it influences appetite regulation and glucose metabolism through two distinct mechanisms.
- Ozempic contains semaglutide, a GLP-1 receptor agonist only. It acts on appetite-regulating and glucose-lowering pathways via the GLP-1 pathway alone.
How they are taken
Both are administered as a once-weekly subcutaneous injection using a pre-filled pen device. Dose strengths differ between the two medicines, and in both cases doses are typically started low and adjusted over time — always under the direction of a prescriber, never independently.
Ozempic vs Wegovy: a note on semaglutide brand names
It is worth noting that semaglutide is available under more than one brand name. Ozempic is licensed primarily for type 2 diabetes management, while Wegovy is the semaglutide brand licensed specifically for weight management. If you are curious about the difference between Mounjaro and Wegovy specifically, or want a closer look at what sets Mounjaro and Wegovy apart, those pages go into further detail. The medicines share the same active substance (semaglutide) but carry different licensed indications and dosing schedules — your prescriber will have selected the appropriate product for you.
Side-effect profiles
Because both medicines work on GLP-1 pathways, the commonly reported side effects overlap considerably. Gastrointestinal effects — nausea, vomiting, diarrhoea, constipation, and indigestion — are among the most frequently reported with both. Injection-site reactions and fatigue are also commonly noted. Individual experience varies; if you have concerns about side effects on whichever medicine you have been prescribed, discuss them with your healthcare professional promptly.
What about retatrutide and other emerging medicines?
Retatrutide is a separate investigational compound that acts on GIP, GLP-1, and glucagon receptors — a triple agonist currently in clinical development. It is not the same as tirzepatide or semaglutide, and is not yet widely available as a licensed prescription medicine. If you have questions about newer agents, your prescriber is the right person to speak to.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Whichever You Are On, GLP Trackr Tracks It
GLP Trackr is built to support people already prescribed any GLP-1-based medicine — whether that is Mounjaro, Wegovy, or another semaglutide product — and it works the same way regardless of which pen you are using.
The most relevant starting point for most users is dose and injection logging: every injection is recorded with its date, dose strength, and site, so you always have a clear history of your treatment. The app also tracks injection-site rotation, suggesting your next site based on your log so you avoid overusing the same area — a practical detail that is easy to lose track of week after week.
If you have questions about how your dose schedule works, take a look at the difference between Mounjaro dose strengths for further context on how titration is typically structured.
Any decision about your dose, or about switching between medicines, belongs with your prescriber — GLP Trackr helps you record and present your journey clearly so those conversations are better informed, but it is not a substitute for clinical guidance. If you experience any symptoms that are severe, persistent, or worrying, contact your healthcare professional promptly.
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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.
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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, a dual GIP and GLP-1 receptor agonist. Ozempic contains semaglutide, which acts on the GLP-1 receptor only. Both are once-weekly prescription injectable medicines; which is appropriate for you is a decision for your prescriber or doctor.
Both Ozempic and Wegovy contain semaglutide, but they are different products with different licensed indications and dosing schedules. Ozempic is primarily licensed for type 2 diabetes; Wegovy is licensed specifically for weight management. Your prescriber will have chosen the right product for your situation.
That is a clinical question only your prescriber or doctor can answer for you. Both medicines act on GLP-1 pathways; Mounjaro additionally acts on GIP receptors. Suitability depends on your individual health history, and no comparison here should be read as a recommendation toward either medicine.
Combining GLP-1 receptor agonists is a clinical decision and not something to attempt without explicit prescriber guidance. If you have questions about your current medicine or any potential interactions, speak with your prescriber or doctor before making any changes.
Yes. GLP Trackr supports people prescribed any GLP-1-based medicine, including Mounjaro and Wegovy or other semaglutide products. You can log doses, track injection sites, monitor side effects, and record your progress regardless of which medicine you have been prescribed.