How Mounjaro, Ozempic, and Wegovy Are Related — and How They Differ
Understanding the landscape of these medicines starts with their active substances and how they act in the body.
Ozempic and Wegovy: the same active substance, different licences
Ozempic and Wegovy both contain semaglutide, a GLP-1 receptor agonist. GLP-1 is a hormone involved in regulating appetite and blood sugar. Both are once-weekly injectable medicines, but they are licensed for different purposes: Ozempic is primarily licensed for type 2 diabetes management, while Wegovy is specifically licensed for chronic weight management. So to answer the common question — are Wegovy and Ozempic the same? They share the same active substance but are distinct products with different licensed indications and dose ranges.
Mounjaro: a dual-action difference
Mounjaro contains tirzepatide, which acts on two receptors: both GLP-1 and GIP (glucose-dependent insulinotropic polypeptide). This dual-receptor action distinguishes it mechanically from semaglutide-based medicines. Mounjaro is a prescription-only, once-weekly injectable medicine licensed for weight management and type 2 diabetes in adults. For a detailed factual comparison of tirzepatide and semaglutide side by side, see how Mounjaro and Ozempic compare on key measures.
Are Mounjaro and Ozempic the same?
No — they have different active substances (tirzepatide vs semaglutide), different mechanisms (dual GIP+GLP-1 vs GLP-1 alone), and are made by different manufacturers. They are related in the sense that both belong to the broader class of incretin-based medicines, but they are not interchangeable. Whether one might be appropriate over the other for a specific person is a clinical decision. You can also read more about whether Ozempic and Mounjaro are the same medicine for a fuller breakdown.
Commonly reported effects across both medicine types
Because both act on GLP-1 pathways, people taking either medicine commonly report similar experiences: reduced appetite, increased feelings of fullness, and gastrointestinal side effects such as nausea, constipation, or indigestion — particularly around dose changes. These are commonly reported, not universal, and their severity and duration vary between individuals. If you are curious about how Mounjaro fits into a broader understanding of this medicine class, the Mounjaro overview covers it in more depth. For a different angle on how tirzepatide affects the body, the relationship between Mounjaro and endometriosis is one example of emerging areas of interest researchers are exploring.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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GLP Trackr is built for people already prescribed Mounjaro or Wegovy (semaglutide), so whichever medicine your prescriber has chosen for you, the app supports your journey in the same way.
The most useful starting point for many users is the side-effect tracker — because medicines in this class share a similar profile of commonly reported experiences (nausea, fatigue, digestive changes), being able to log how you feel day to day, and see whether patterns shift over time or after dose changes, gives you something concrete and organised to discuss with your prescriber at your next appointment. GLP Trackr also lets you log each weekly injection — dose strength, date, and site — so your record is always accurate, and dose reminders mean a weekly shot is never accidentally overlooked.
GLP Trackr is a tracking and journaling tool. It is not a medical service and does not provide clinical advice — if you have questions about which medicine is right for you, whether to switch, or how to manage any side effects you're experiencing, those conversations belong with your prescriber or doctor, who knows your full history.
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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.
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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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Frequently asked questions.
No. Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist, while Ozempic contains semaglutide, a GLP-1 receptor agonist only. They are different medicines with different active substances, made by different manufacturers, though both are once-weekly injectables used in diabetes and weight management.
Wegovy and Ozempic both contain semaglutide, so they share the same active substance. However, they are different licensed products: Ozempic is primarily licensed for type 2 diabetes, while Wegovy is licensed specifically for chronic weight management, and they are used at different dose ranges.
The key difference is the mechanism: Mounjaro (tirzepatide) acts on both GLP-1 and GIP receptors, while Ozempic (semaglutide) acts on GLP-1 receptors alone. Both are prescription-only, once-weekly injectables. Which is appropriate for a specific individual is a decision for their prescriber or doctor.
No. Any decision to start, stop, or switch prescription medicines must be made by your prescriber or doctor. They will consider your full medical history and circumstances before making any change to your treatment.
Yes. GLP Trackr is built for people already prescribed either Mounjaro (tirzepatide) or Wegovy (semaglutide). You can log weekly injections, track side effects, monitor weight and mood, and review your progress whichever medicine your prescriber has chosen for you.