How Ozempic and Mounjaro Differ: The Key Facts
Ozempic (semaglutide) and Mounjaro (tirzepatide) belong to the same broad class of medicines but work in subtly different ways — a distinction worth understanding.
Active substance and mechanism
- Ozempic (semaglutide) is a GLP-1 receptor agonist. It mimics a hormone called GLP-1 that is released after eating, acting on appetite-regulating pathways to reduce hunger and slow gastric emptying.
- Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist. It targets both GLP-1 and a second hormone pathway (GIP), which is thought to contribute to its effects on appetite and metabolism.
How they are taken
Both medicines are given as once-weekly subcutaneous injections using pre-filled pens. Both are started at a low dose and adjusted over time — always under a prescriber's direction, never independently.
What they are licensed for
It is worth noting that Ozempic (semaglutide) is primarily licensed for type 2 diabetes management. Wegovy is the semaglutide brand licensed specifically for weight management. If you are comparing these medicines in the context of weight loss, you may also find it useful to read about Ozempic or Mounjaro for weight loss or explore the broader Ozempic or Mounjaro comparison for more context.
Side-effect profiles
Both medicines share a similar range of commonly reported side effects — particularly gastrointestinal ones such as nausea, vomiting, diarrhoea, constipation, and indigestion. These are most common early in treatment or after a dose increase, and many people find they ease over time. Individual experience varies considerably. If you are weighing up semaglutide-based options more broadly, the Mounjaro vs Wegovy comparison covers the licensed weight-management medicines side by side.
According to information published on the electronic Medicines Compendium (eMC), both products carry additional monitoring status in the UK — meaning any suspected side effects should be reported to your national reporting scheme (such as the UK's Yellow Card scheme) and discussed with your healthcare professional.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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The question of which medicine is "better" is one for your prescriber — they know your full health picture in a way no article can. What GLP Trackr can do is help you get the most out of whichever medicine you have been prescribed.
The app's side-effect tracker is particularly useful when navigating the early weeks on either medicine. You can log symptoms like nausea or fatigue as they happen, see how they change over time, and bring a clear record to your next prescriber appointment — rather than trying to recall how you felt three weeks ago. The built-in doctor report feature compiles your logged data into a summary you can actually share.
Alongside that, dose and injection logging means every weekly shot is recorded — date, dose strength, and injection site — so your treatment history is always in one place, whether you are on Mounjaro or a semaglutide-based medicine. For a fuller guide to tracking both medicines, visit the Wegovy vs Mounjaro hub.
GLP Trackr supports users on both tirzepatide and semaglutide. Any decision about which medicine you take — or whether to switch — belongs with your prescriber, not an app. If symptoms are severe, persistent, or worrying, contact your healthcare professional promptly.
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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.
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 target different hormone pathways. Your prescriber can explain what that means for your individual situation.
This is a clinical decision that depends on your health history, any existing conditions, and your prescriber's assessment. No article can determine which medicine is better for a specific individual. Discuss your options with your prescriber or doctor.
Any decision to switch, start, or stop a prescription medicine must be made with your prescriber — never independently. They will weigh up the clinical factors relevant to your situation before making any change to your treatment.
Both medicines commonly cause gastrointestinal effects such as nausea, vomiting, and constipation, especially early in treatment. Individual experience varies. If side effects are severe or persistent, contact your healthcare professional rather than adjusting your dose on your own.
Yes. GLP Trackr supports users on any GLP-1 or dual GIP/GLP-1 medicine, including semaglutide and tirzepatide products. You can log doses, injection sites, side effects, weight, and food regardless of which medicine you have been prescribed.