How Mounjaro and Wegovy Differ: Active Substances and Mechanisms
The most important difference between the two medicines lies in how they act on the body's appetite-regulating pathways.
Wegovy (semaglutide)
Wegovy contains the active substance semaglutide and works as a GLP-1 receptor agonist. GLP-1 (glucagon-like peptide-1) is a hormone involved in regulating appetite and fullness. By mimicking this hormone, semaglutide is commonly reported to help reduce appetite and increase the sense of fullness after eating. Dose strengths typically referenced are 0.25 mg, 0.5 mg, 1 mg, 1.7 mg, and 2.4 mg, started low and adjusted by the prescriber over time.
Mounjaro (tirzepatide)
Mounjaro contains the active substance tirzepatide and acts as a dual GIP and GLP-1 receptor agonist — meaning it targets two appetite-regulating pathways rather than one. GIP (glucose-dependent insulinotropic polypeptide) is a second hormone involved in appetite and metabolism. Dose strengths commonly referenced are 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg, again started at a low dose and adjusted by the prescriber. For a deeper look at how the two medicines compare side by side, see our detailed comparison of Mounjaro and Wegovy.
How they are taken
Both medicines are supplied as pre-filled injection pens and are injected once a week, typically into the abdomen, thigh, or upper arm. Both carry a black triangle (▼) designation, meaning they are subject to additional monitoring. Any side effects should be reported to your healthcare professional and to your national reporting scheme (such as the UK's Yellow Card scheme). If you are also curious about how Mounjaro compares with another GLP-1 medicine, our page on the difference between Mounjaro and Ozempic covers that in full.
What they have in common
- Both are prescription-only medicines — suitability is decided by a prescriber, not self-selected
- Both mimic GLP-1 and are commonly reported to reduce appetite and food noise
- Both involve a titration schedule, starting at a lower dose
- Neither is insulin, and neither is a substitute for clinical supervision, diet, and activity
- Neither is suitable for everyone; your prescriber is the only person who can assess that
If you are prescribed Mounjaro and want to understand how the different strength pens compare, the page on the difference between 2.5 mg and 5 mg Mounjaro explains that clearly.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Whichever You're On, GLP Trackr Supports Your Journey
GLP Trackr is built for people already taking either Mounjaro or Wegovy — the app works the same way regardless of which medicine you have been prescribed.
Because both medicines involve a weekly injection schedule with gradual dose progression, dose logging is often the most immediately useful feature: every injection is recorded with its date, dose strength, and injection site, so you always have an accurate picture of where you are in your treatment. The app also tracks side effects over time — useful because both tirzepatide and semaglutide share commonly reported effects such as nausea, fatigue, and changes in appetite, and seeing patterns in your own data can make conversations with your prescriber much more productive. From there, the insights and analytics tools help you connect your dose history, food, sleep, and weight data into a clearer view of your journey.
For a comprehensive overview of everything covered in this comparison, visit our guide to Wegovy vs Mounjaro.
Any decision about which medicine is right for you, or whether to switch, should always be made with your prescriber — they have the full clinical picture that no app can replicate. GLP Trackr is here to help you track and understand your journey, not to replace that guidance.
GLP Trackr is free to download on the App Store and Google Play, with a 7-day free trial — give it a try and see how much easier it is to stay on top of your weekly schedule.
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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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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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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, while Wegovy contains semaglutide, which acts on GLP-1 only. Both are once-weekly prescription injections used in weight management, but they have different active substances and mechanisms.
Neither can be described as universally better. Suitability depends entirely on your individual health history and circumstances. Only your prescriber or doctor can determine which medicine, if either, is appropriate for you.
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist used in weight management, while Ozempic (semaglutide) is a GLP-1 agonist primarily licensed for type 2 diabetes. Wegovy also contains semaglutide but at a higher dose licensed for weight management.
Any change to your prescribed medicine is a clinical decision that must be made by your prescriber or doctor. Do not switch, start, or stop any prescription medicine without discussing it with your healthcare professional first.
Yes. GLP Trackr supports people on both Mounjaro and Wegovy. You can log doses, track injection sites, record side effects, and monitor your progress regardless of which medicine you have been prescribed.