How Ozempic and Mounjaro Differ: The Factual Picture
The most important distinction is the mechanism of action. Ozempic contains semaglutide, a GLP-1 receptor agonist. It mimics a naturally occurring gut hormone involved in appetite regulation and slows gastric emptying, which many people experience as reduced hunger and a quieter relationship with food. Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist — meaning it acts on two pathways rather than one. According to information on the electronic Medicines Compendium (eMC), tirzepatide's dual action is considered a distinct pharmacological approach compared with single GLP-1 agonists.
It is worth noting that Ozempic is licensed primarily for type 2 diabetes management, while Wegovy — a higher-dose formulation of the same active substance, semaglutide — is the version licensed specifically for weight management in many countries. Mounjaro holds a weight management licence under its own brand. If your prescriber has prescribed one of these medicines for weight loss, they will have considered which is appropriate for you.
Key factual points side by side
- Active substance: Ozempic = semaglutide (GLP-1 agonist); Mounjaro = tirzepatide (dual GIP + GLP-1 agonist)
- Delivery: Both are once-weekly subcutaneous injections via pre-filled pens
- Dose titration: Both are typically started at a low dose and adjusted over time by the prescriber
- Prescription-only: Both are prescription medicines — suitability and dosing decisions rest entirely with your prescriber
- Side-effect profile: Both commonly involve gastrointestinal effects such as nausea, vomiting, and changes in bowel habits, particularly around dose increases
For a broader look at how these medicines compare across more dimensions, see our detailed Ozempic vs Mounjaro for weight loss comparison, or explore the related question of which medicine may suit different situations — bearing in mind that any final decision belongs with your prescriber.
You may also find it useful to read whether Ozempic or Mounjaro is considered more effective, approached from a similarly neutral, evidence-informed perspective.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Whichever You've Been Prescribed, GLP Trackr Supports Your Journey
GLP Trackr is built specifically for people already on Mounjaro or a semaglutide medicine like Ozempic or Wegovy — so whichever your prescriber has chosen for you, the app works the same way. The feature most relevant here is the side-effect and symptom tracker: because both medicines can cause overlapping gastrointestinal effects, being able to log exactly when symptoms appear, how intense they are, and how they evolve over time gives you something genuinely useful to bring to your next prescriber appointment rather than trying to recall it from memory.
Alongside that, the dose and injection logger means every weekly shot is recorded — date, dose strength, and injection site — so you always have an accurate picture of where you are in your titration schedule. When your prescriber asks how you've been getting on, you have real data to share.
If you want to see how both medicines sit within the wider semaglutide versus tirzepatide conversation, the Wegovy vs Mounjaro hub brings together the full comparison picture.
Whatever medicine you have been prescribed, always follow the guidance of your prescriber or doctor — they know your full medical history and are the right person to advise on suitability, dosing, and any concerns that come up along the way.
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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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Frequently asked questions.
Ozempic contains semaglutide, a GLP-1 receptor agonist, while Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. Both are once-weekly injections, but their mechanisms differ. Which is appropriate for you is a decision for your prescriber or doctor.
That question can only be answered by your prescriber, who will consider your health history, any other conditions, and your individual circumstances. This page provides factual information only and does not recommend one medicine over the other.
Any change to your prescribed medicine — including switching between semaglutide and tirzepatide — is a decision for your prescriber or doctor. Never stop, start, or change a prescription medicine without discussing it with them first.
Yes. GLP Trackr is designed for people already taking any GLP-1 medicine, including Mounjaro (tirzepatide) and semaglutide-based medicines such as Ozempic and Wegovy. You can log doses, side effects, weight, food, and more regardless of which medicine you have been prescribed.
Both medicines commonly cause gastrointestinal effects such as nausea, vomiting, constipation, and diarrhoea, particularly around dose increases. Individual experiences vary. If you have concerns about side effects, speak with your prescriber or healthcare professional.