How Ozempic and Mounjaro Differ: Active Substances and Mechanisms
The most fundamental difference lies in how each medicine acts on the body.
Ozempic (semaglutide)
Ozempic contains the active substance semaglutide, a GLP-1 receptor agonist. It mimics glucagon-like peptide-1 (GLP-1), a hormone involved in appetite regulation and blood sugar control. By activating GLP-1 receptors, semaglutide is commonly reported to increase feelings of fullness and reduce appetite. It is supplied as a pre-filled pen and injected once weekly. It is worth noting that Ozempic and Wegovy both contain semaglutide but are licensed for different indications — if you are curious about the comparison relevant to weight management specifically, the Mounjaro and Wegovy comparison covers that in more detail.
Mounjaro (tirzepatide)
Mounjaro contains the active substance tirzepatide, a dual GIP and GLP-1 receptor agonist. This means it acts on two appetite-regulating pathways — glucose-dependent insulinotropic polypeptide (GIP) receptors as well as GLP-1 receptors. Mounjaro is also injected once weekly via a pre-filled pen. For a closer look at how Mounjaro compares with the weight-specific semaglutide product, see the Wegovy vs Mounjaro overview.
What they have in common
- Both are prescription-only medicines — suitability is decided by a prescriber
- Both are once-weekly injectables supplied as pre-filled pens
- Both act on appetite-regulating pathways and are commonly reported to reduce food noise and increase fullness
- Neither is insulin, and neither is a substitute for diet, activity, and clinical supervision
- Both carry additional monitoring requirements — report any side effects to your healthcare professional and, where applicable, to your national reporting scheme (such as the UK's Yellow Card scheme)
For a more detailed breakdown of how the active substances compare, the page on the difference between Ozempic and Mounjaro goes further. If you are on Mounjaro and want to understand the dose steps available to you, the difference between 2.5 mg and 5 mg Mounjaro may also be useful.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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GLP Trackr is built for people already taking a GLP-1 medicine — whether that's a semaglutide or tirzepatide product. The app supports both, and the features work the same way regardless of which you have been prescribed.
The most relevant starting point for most users is side-effect and symptom tracking. Both medicines share commonly reported side effects — nausea, fatigue, digestive changes — and logging how you feel day to day means you build a clear picture over time. That record can be genuinely useful to bring to your next prescriber appointment, rather than trying to recall weeks of symptoms from memory. GLP Trackr also lets you log each injection: the dose strength, date, and site, with rotation suggestions so you're not returning to the same spot too often.
Together, these features mean your journey is documented in one place — whatever medicine you are taking.
GLP Trackr is a tracking and journaling app. It does not offer medical advice, and nothing here should replace the guidance of your prescriber or doctor. If you have any concerns about which medicine is right for you, or about symptoms you are experiencing, speak with your healthcare professional.
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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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Frequently asked questions.
Ozempic contains semaglutide, a GLP-1 receptor agonist. Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. Both are once-weekly injectables, but they work on different combinations of appetite-regulating pathways.
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 should always be assessed clinically.
No. Ozempic and Wegovy both contain semaglutide and act on GLP-1 receptors. Mounjaro contains tirzepatide, which acts on both GIP and GLP-1 receptors. They are different medicines with different active substances.
Any decision to switch, start, or stop a prescription medicine belongs with your prescriber or doctor. Do not change your medication without consulting them first.
Yes. GLP Trackr supports people on any GLP-1 medicine, including both semaglutide and tirzepatide products. You can log your dose, injection site, side effects, weight, and more, whichever medicine you have been prescribed.