Eli Lilly and Mounjaro: The Background
Eli Lilly and Company — often referred to simply as Lilly — is one of the world's largest pharmaceutical companies, with more than a century of history in developing medicines for metabolic conditions including diabetes and obesity. Mounjaro is among its most prominent recent products in this space.
What Mounjaro is
Mounjaro's active substance is tirzepatide, a prescription-only, once-weekly injectable medicine. It works on two appetite-regulating pathways — GLP-1 (glucagon-like peptide-1) and GIP (glucose-dependent insulinotropic polypeptide) receptors — which is why it is described as a dual receptor agonist. This distinguishes it mechanically from medicines that act on GLP-1 alone. For a factual comparison of the two, see our page on who makes Wegovy, the semaglutide-based alternative made by Novo Nordisk.
The Mounjaro brand and regulatory status
Mounjaro carries a black triangle (▼) symbol in the UK and some other markets, meaning it is subject to additional monitoring. If you experience a side effect, you are encouraged to report it through your national reporting scheme — such as the UK's Yellow Card scheme — and to inform your prescriber or doctor. Suitability, dosing, and whether Mounjaro is the right medicine for you are decisions made by your prescriber, not the manufacturer.
If you want to understand more about who holds the licence for the product, our page on who owns the Mounjaro licence covers this in more detail. You may also find it useful to read about who shouldn't take Mounjaro if you have questions about suitability — though any personal decision about suitability always rests with your prescriber or doctor. For a broader overview of the medicine, visit our Mounjaro guide.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Your Mounjaro Journey with GLP Trackr
Knowing who makes your medicine is a natural part of understanding what you have been prescribed. The next step — getting the most out of it — comes down to staying consistent and informed throughout your journey.
GLP Trackr's dose and injection logging is built specifically for people already taking Mounjaro or Wegovy. Each time you inject, you can record the dose strength, date, time, and injection site in a few taps, building a clear history that belongs to you. The app also tracks injection-site rotation, suggesting your next site based on your recent logs so you never have to remember manually.
If you want to bring a clear, organised summary to your next appointment, the doctor report feature pulls your logged data — doses, weight, side effects, and progress — into a format you can share with your prescriber or doctor. It does not replace their clinical judgement; it simply gives them a better picture of your experience.
GLP Trackr is a tracking app, not a medical service. Any questions about your dose, how Mounjaro was made, or whether it is right for you should go to your prescriber or doctor — they know your full history.
Ready to keep your Mounjaro journey organised in one place? Download GLP Trackr on the App Store or Google Play and explore it free for 7 days.
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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.
Hydration Reminders
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.
Smart Meal Planning
Personalized meal plans built around your current dose phase and side effects. Every meal is GLP-1 optimized — high in protein, gentle on the stomach, and scaled to your reduced appetite.
Recipe Library
Browse 50+ high-protein, GLP-1-friendly recipes filtered by meal type, prep time, and dietary needs. Every recipe includes full nutrition info, step-by-step instructions, and tips for eating with side effects.
Progress Analytics
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.
AI Meal Scanning
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 weight, measurements, and how you're feeling after each dose. GLPTrackr turns your data into clear, motivating charts that show you how far you've really come.
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GLPIQ learns your personal side effect patterns over time. After a few cycles, it starts warning you the morning before a rough day — and adjusts your meal plan automatically.
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Frequently asked questions.
Mounjaro is made by Eli Lilly and Company, a global pharmaceutical company. The active substance is tirzepatide, a dual GIP and GLP-1 receptor agonist supplied as a prescription-only, once-weekly injectable medicine.
Wegovy (semaglutide) is made by Novo Nordisk, a separate pharmaceutical company. Unlike Mounjaro, Wegovy acts on GLP-1 receptors only. Both are prescription-only medicines; which is appropriate for you is a decision for your prescriber or doctor.
No. Mounjaro contains tirzepatide (made by Eli Lilly) and acts on both GIP and GLP-1 receptors. Ozempic contains semaglutide (made by Novo Nordisk) and acts on GLP-1 receptors only. They are different medicines from different manufacturers.
Dosing guidance for Mounjaro comes from your prescriber or doctor, not directly from the manufacturer. Any decisions about your dose — including adjustments — should always be made in consultation with your healthcare professional.
Report side effects to your prescriber or doctor and through your national reporting scheme — such as the UK's Yellow Card scheme. Mounjaro carries a black triangle (▼) status in some markets, meaning it is subject to additional monitoring.