How Ozempic and Mounjaro Differ
The key difference lies in the active substance and how each medicine acts on the body.
Ozempic (semaglutide)
Ozempic contains semaglutide, a GLP-1 receptor agonist. It works by mimicking a naturally occurring hormone that plays a role in regulating appetite and blood sugar. It acts on a single receptor pathway — the GLP-1 pathway. Semaglutide is also the active substance in Wegovy, a separate product licensed specifically for weight management; if you are curious about that distinction, the page on whether Ozempic and Wegovy are the same covers it in detail.
Mounjaro (tirzepatide)
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. This means it acts on two hormone pathways — both GIP and GLP-1 — rather than one. Both medicines are prescription-only and administered as once-weekly subcutaneous injections, but the different mechanisms mean they are clinically distinct products. For a fuller side-by-side breakdown, see the differences between Ozempic and Mounjaro.
Why people confuse them
The confusion is understandable. Both medicines belong to the broader class of GLP-1-related treatments, both involve weekly injections, and both are widely discussed in the context of weight management. Media coverage and online conversations often use brand names interchangeably — which is why it is worth knowing exactly which medicine has been prescribed to you and why. You can also read more on the Ozempic and Mounjaro overview for additional context. Any questions about which treatment is right for your situation should be directed to your prescriber or doctor — that decision depends on your individual health history.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Whichever Medicine You Have Been Prescribed
Whether you are taking Mounjaro (tirzepatide) or a semaglutide-based medicine, keeping a consistent log of your doses, how you feel, and how your body responds is one of the most useful things you can do during your treatment journey.
GLP Trackr is built specifically for people already on GLP-1 medicines. The dose and injection logging feature lets you record every weekly shot — including the date, dose strength, and injection site — so your treatment history is always clear in one place. As you build up a record, the side-effect tracker helps you spot patterns over time, which can be genuinely useful to bring to your next prescriber appointment. The app supports both Mounjaro and semaglutide-based treatments, so whichever you have been prescribed, your journey is covered.
You can explore more about tracking your Mounjaro journey on the Mounjaro tracking hub.
GLP Trackr provides general information and tracking tools — it is not a substitute for advice from your prescriber or doctor, who knows your full medical history.
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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.
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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.
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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. Ozempic contains semaglutide, a GLP-1 receptor agonist, while Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. They are separate prescription-only medicines with different active substances and mechanisms, though both are given as once-weekly injections.
Not exactly. Both act on the GLP-1 pathway, but Mounjaro (tirzepatide) also activates the GIP pathway, making it a dual-acting medicine. Ozempic (semaglutide) targets GLP-1 only. Your prescriber or doctor can explain what this means for your individual treatment.
Both are once-weekly injectable medicines frequently discussed together in the context of weight management, and both belong to the GLP-1 class of treatments. This leads to frequent confusion, but they contain different active substances and are clinically distinct products.
Any decision to change, switch, or adjust your prescribed medication is one for your prescriber or doctor — not something to decide independently. They can assess your full health history and advise on the most appropriate treatment for you.
Yes. GLP Trackr supports people already prescribed any GLP-1 medicine, including Mounjaro (tirzepatide) and semaglutide-based treatments such as Ozempic or Wegovy. You can log doses, track side effects, and monitor your progress whichever medicine you have been prescribed.