How Ozempic and Mounjaro Differ: The Key Facts
Ozempic contains semaglutide and works as a GLP-1 receptor agonist. It mimics a naturally occurring hormone that helps regulate appetite and blood sugar, contributing to a reduced sense of hunger that many people report while taking it. Ozempic is licensed primarily for type 2 diabetes management; its higher-dose sibling, Wegovy (also semaglutide 2.4 mg), carries a specific weight-management licence in many countries.
Mounjaro contains tirzepatide and acts as a dual GIP and GLP-1 receptor agonist — meaning it targets two appetite-related pathways rather than one. According to information on the electronic Medicines Compendium, tirzepatide activates both glucose-dependent insulinotropic polypeptide (GIP) and GLP-1 receptors. This dual action is what distinguishes it mechanistically from semaglutide-based medicines. Mounjaro carries a weight-management licence in a number of countries, including for use in some publicly funded programmes where eligible patients meet prescriber-defined criteria.
Shared characteristics
- Both are prescription-only medicines — neither can be obtained without a prescription from a qualified prescriber
- Both are administered as once-weekly subcutaneous injections via pre-filled pens
- Both are typically started at a low dose and increased gradually, as directed by the prescriber
- Both can cause similar gastrointestinal side effects, including nausea, vomiting, diarrhoea, and constipation — particularly in the early weeks or after a dose change
- Both carry a black-triangle (▼) designation in the UK, meaning side effects should be reported to your healthcare professional and to your national reporting scheme (such as the UK's Yellow Card scheme)
Key differences at a glance
- Active substance: Ozempic = semaglutide; Mounjaro = tirzepatide
- Mechanism: Ozempic acts on GLP-1 receptors only; Mounjaro acts on both GLP-1 and GIP receptors
- Primary licence: Ozempic is licensed for type 2 diabetes in many markets; Mounjaro holds weight-management approval in several countries
- Dose strengths: they differ — your prescriber or pharmacist is the right source for details specific to your prescription
If you are considering the difference between semaglutide-based options specifically, the Wegovy vs Mounjaro comparison covers that in more depth. For a broader look at how these two medicines are discussed side by side, see Ozempic vs Mounjaro. You may also find it useful to read about choosing between Ozempic and Mounjaro for weight loss in terms of what questions to raise with your prescriber.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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GLP Trackr is built to support people already prescribed either semaglutide or tirzepatide — it does not favour one medicine over the other, and it does not sell, supply, or source either. The app works for your journey regardless of which medicine your prescriber has chosen for you.
Because both medicines involve a weekly injection schedule and a gradual dose-titration process, dose and injection logging is where many users find the most immediate value. GLP Trackr lets you record each injection — the dose strength, date, time, and injection site — so you always have an accurate record to refer back to or share with your prescriber. The app also tracks injection-site rotation, suggesting your next site so you are not guessing.
If you are navigating side effects — which are common in the early weeks on either medicine — the side-effect tracker lets you log symptoms and spot patterns over time. That record can be genuinely useful to bring to a prescriber appointment. For a detailed look at how side effects compare between these medicines, comparing Wegovy and Mounjaro side effects is worth reading alongside this page.
Beyond dosing, GLP Trackr brings together weight tracking, food logging, daily check-ins for mood and energy, and insights that help you understand your own progress — because the journey involves far more than which medicine is on your pen.
Any decision about which medicine you take, or any change to your dose, belongs with your prescriber — they know your full medical history and are best placed to advise you. GLP Trackr supports your journey; it is not a substitute for that clinical relationship.
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Frequently asked questions.
Ozempic contains semaglutide and acts on GLP-1 receptors only. Mounjaro contains tirzepatide and acts on both GLP-1 and GIP receptors — a dual mechanism. Both are prescription-only medicines; which is appropriate for you is a decision for your prescriber or doctor.
Yes. Tirzepatide is the active substance in Mounjaro. The two names refer to the same medicine — tirzepatide is the scientific name, Mounjaro is the brand name. It is a dual GIP and GLP-1 receptor agonist, distinct from semaglutide, which is the active substance in Ozempic and Wegovy.
No comparison article can answer that for you. Both are prescription-only medicines and suitability depends on your individual health, history, and goals. Your prescriber or doctor is the right person to discuss which option is appropriate for your circumstances.
Any decision to switch or substitute medicines should be made with your prescriber — never independently. They contain different active substances with different mechanisms, and a change would require clinical assessment and a new or amended prescription.
Yes. GLP Trackr supports people already prescribed either semaglutide (Ozempic or Wegovy) or tirzepatide (Mounjaro). You can log doses, injection sites, side effects, weight, and food regardless of which medicine your prescriber has chosen for you.