Mounjaro, Tirzepatide, and Why the Same Medicine Has More Than One Name
Every prescription medicine has at least two names: a brand name chosen by the manufacturer and an International Non-proprietary Name (INN), which is the standardised scientific name used by healthcare professionals and regulators worldwide.
The brand name: Mounjaro
Mounjaro is the brand name given to this medicine by its manufacturer, Eli Lilly. It is the name printed on the pen packaging and is the name most commonly used in everyday conversation among people who take it.
The active substance: tirzepatide
Tirzepatide is the INN — the internationally recognised name for the active ingredient. This is the name you will see on a prescription, in a patient information leaflet, in the Summary of Product Characteristics (SmPC) on the electronic Medicines Compendium, and in clinical or pharmacist communications. Tirzepatide is a dual GIP and GLP-1 receptor agonist, meaning it acts on two appetite-regulating pathways in the body.
Are there other names to know?
Occasionally, the medicine may be referred to by its chemical or research name during early development, but in day-to-day use the only two names that matter are Mounjaro (brand) and tirzepatide (active substance). There are no generic versions currently available under a different brand name in most countries, though this may change over time — your prescriber or doctor will always be the best source of current information.
For a broader overview of this medicine and how it is used, see our guide to Mounjaro and your treatment journey. If you have questions about the physical pen itself, our page on injection devices for Mounjaro covers what to expect.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Keeping Your Records Straight with GLP Trackr
When your prescription says tirzepatide and your pen says Mounjaro, it is easy to feel uncertain about whether everything lines up. One practical way to stay on top of this is to log each dose clearly — noting the brand name, dose strength, and date — so you have a consistent record whatever terminology appears in your paperwork.
GLP Trackr's dose logging feature lets you record every injection: the dose strength, the date, and the time. Over weeks and months, this builds a clear timeline you can refer back to — and, importantly, one you can bring to appointments with your prescriber or doctor. If there is ever any confusion about what you have taken and when, your log speaks for itself.
The app also lets you note anything you want to discuss at your next appointment, so a question like "my prescription says tirzepatide but I want to confirm this is the same as Mounjaro" can be flagged in context alongside your actual dose history. You can explore more about what the app tracks on our Mounjaro names and terminology page, or read about understanding your Mounjaro prescription for more context.
GLP Trackr is an informational tracking tool — it is not a substitute for the guidance of your prescriber or doctor. If you ever have genuine uncertainty about your prescription or what medicine you have been given, contact your healthcare professional to clarify.
Ready to keep a clear, confident record of your treatment? Download GLP Trackr on the App Store or Google Play and explore it free for 7 days — no commitment needed.
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Morning Check-In
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.
Injection Tracking
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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Beautiful, easy-to-read charts show your weight loss trajectory, weekly nutrition trends, medication responses, and wellbeing scores over time — turning raw data into genuine insights.
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Snap a photo of any meal and get a full nutrition breakdown in seconds — calories, protein, carbs, fat, and fibre. No searching. No manual logging. Just point, snap, and track.
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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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Log your Mounjaro or Wegovy injection in seconds. Track your pen, your dose level, and your injection site — so you always know exactly where you are in your treatment.
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Frequently asked questions.
The active ingredient in Mounjaro is tirzepatide, its International Non-proprietary Name (INN). Mounjaro is the brand name; tirzepatide is the standardised scientific name used by prescribers, pharmacists, and regulators worldwide. Both names refer to the same medicine.
Yes. Tirzepatide is the active substance inside Mounjaro. When a prescription or clinical document refers to tirzepatide, it means the same medicine as the Mounjaro pen you inject. If you are ever unsure, your prescriber or doctor can confirm.
Prescribers and pharmacists often use the active substance name (tirzepatide) rather than the brand name (Mounjaro) on prescriptions and clinical notes. This is standard practice worldwide and does not indicate a different product.
In most countries, Mounjaro is currently the recognised brand name for tirzepatide as a weight-management medicine. Brand availability can vary by country and may change over time — your prescriber or doctor will have the most up-to-date information for your location.
Logging each dose in a tracking app such as GLP Trackr — noting the brand name, dose strength, and date — gives you a clear record to refer to and share with your prescriber. Always confirm any uncertainty about your prescription directly with your healthcare professional.