What Mounjaro (tirzepatide) by Lilly Is and How It Works
Tirzepatide, marketed under the brand name Mounjaro, was developed by the pharmaceutical company Eli Lilly. Unlike earlier GLP-1 medicines, tirzepatide acts on two appetite-regulating pathways simultaneously — the GLP-1 (glucagon-like peptide-1) receptor and the GIP (glucose-dependent insulinotropic polypeptide) receptor. This dual action is what distinguishes it from GLP-1-only medicines.
How it is typically prescribed
Mounjaro is supplied as a pre-filled injection pen and is taken once weekly. It is generally started at a low dose, with any adjustments made by the prescriber over time based on how the individual is responding. Dose decisions are entirely a matter for your prescriber or doctor — every person's treatment plan is different.
What people commonly experience
Many people on Mounjaro report a noticeable reduction in appetite and a quieter relationship with food — sometimes described as reduced food noise. Slower gastric emptying is a commonly reported effect, which contributes to a greater sense of fullness after smaller meals. Gastrointestinal side effects such as nausea, constipation, or indigestion are also commonly reported, particularly after dose adjustments. These often ease over time, but if anything feels severe or persistent, it is important to speak with your healthcare professional promptly.
Mounjaro carries a black triangle (▼) designation, meaning it is subject to additional monitoring. Any suspected side effects should be reported to your healthcare professional and to your national reporting scheme (such as the UK's Yellow Card scheme).
For a broader overview of the medicine, see our complete Mounjaro guide. If you are interested in how others on tirzepatide are navigating their journeys, the Mounjaro community forums can offer real-world perspective.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Staying Consistent on Mounjaro with GLP Trackr
Once you are prescribed Mounjaro, the practical challenge shifts to staying consistent — logging every weekly dose, noticing how you feel, and building a clear picture of your progress to share with your prescriber. That is exactly what GLP Trackr is built for.
Dose logging and reminders
The app lets you log each injection with the dose strength, date, and time, so you always have a reliable record of where you are in your treatment. Gentle reminders mean a dose is far less likely to slip by unnoticed — particularly useful when life gets busy mid-titration. If you ever need to discuss a missed or delayed dose with your prescriber, you will have the full log ready to refer to.
Tracking how you feel
GLP Trackr's side-effect tracker lets you record symptoms — nausea, fatigue, changes in appetite — and see patterns over time. The app also generates a doctor report summarising your journey, which you can bring to your next prescriber appointment. It is a practical way to turn your day-to-day experience into something useful for those conversations. The app is a tracking tool, not a substitute for clinical guidance — always follow the advice of your prescriber or doctor, who knows your full medical history.
Curious about what the dose stages on Mounjaro look like? Our page on the 3 mg Mounjaro stage covers what many people experience early in their titration journey.
Ready to bring your weekly Mounjaro routine into one clear, organised place? GLP Trackr is free to try for 7 days — available on the App Store and Google Play. Log your doses, track how you feel, and go into every prescriber appointment informed.
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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.
Community Support
Connect with thousands of others navigating the same medication journey. Share milestones, ask questions, find accountability partners, and get support from people who truly understand.
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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.
Mounjaro is manufactured by Eli Lilly and Company. Its active substance is tirzepatide, a dual GIP and GLP-1 receptor agonist supplied as a pre-filled once-weekly injection pen.
Mounjaro (tirzepatide) acts on both the GLP-1 and GIP receptors, making it a dual agonist. Most earlier medicines in this class act on GLP-1 only. Your prescriber can advise on what is appropriate for you.
Commonly reported side effects include nausea, constipation, indigestion, and fatigue — particularly after dose adjustments. These often ease over time. If symptoms are severe or persistent, contact your healthcare professional promptly.
GLP Trackr lets you log each weekly dose, set injection reminders, track side effects, and generate a summary report for your prescriber appointments — keeping your entire Mounjaro journey in one organised place.
Yes. Mounjaro carries additional monitoring status, so suspected side effects should be reported to your healthcare professional and to your national reporting scheme, such as the UK's Yellow Card scheme.