What Mounjaro Is and How It Works
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — meaning it acts on two appetite-regulating hormone pathways rather than one. This distinguishes it from medicines that act on the GLP-1 pathway alone. To understand the broader GLP-1 mechanism, see our guide on what GLP-1 is and how it works.
What it is prescribed for
Mounjaro is prescribed for weight management in adults who meet certain clinical criteria. Suitability is determined entirely by a prescriber or doctor based on an individual's medical history — it is not suitable for everyone, and the decision to prescribe it belongs with a qualified healthcare professional.
How it is taken
It is supplied as a pre-filled injection pen and taken once a week. Common injection sites are the abdomen, thigh, or upper arm. The dose is typically started low and adjusted over time by the prescriber — dose decisions are never something to make independently.
What it is not
A common question is whether Mounjaro is a form of insulin. It is not — for a fuller explanation of the difference, see is Mounjaro insulin? Mounjaro is also not a cosmetic treatment, a quick fix, or a substitute for clinical supervision and lifestyle changes.
Commonly reported effects
Many people report a reduced appetite and a lower level of food preoccupation (sometimes called "food noise"), as well as a feeling of fullness after smaller amounts of food. Slower stomach emptying is also commonly described, though this effect often eases over time. These are general observations — individual experience varies, and your prescriber or doctor is best placed to discuss what to expect given your specific circumstances.
Commonly reported side effects include nausea, constipation, diarrhoea, indigestion, and fatigue, particularly in the early weeks or after a dose adjustment. According to the electronic Medicines Compendium (eMC), the full side-effect profile is listed in the official product information, which is worth reading alongside guidance from your prescriber. Any side effects that are severe, persistent, or concern you should be discussed with your healthcare professional promptly, and reported to your national pharmacovigilance scheme (such as the UK Yellow Card scheme or the equivalent in your country).
Curious about the ingredients and components of the pen itself? See what Mounjaro is made of for a factual breakdown.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
AI Meal Tracking. Built for GLP 1 Appetites.
Point your camera at any meal and let our AI do the rest. Breakfast, doses, weight, mood all tracked in seconds.
Tracking Your Mounjaro Journey with GLP Trackr
Once you are prescribed Mounjaro, staying consistent week after week is one of the biggest practical challenges — and that is exactly where GLP Trackr is designed to help.
Logging doses and side effects
The most immediately useful feature for someone starting out is dose logging: recording each injection — its date, time, and dose strength — so you always have a clear record of where you are in your treatment. Paired with dose reminders, the app makes it straightforward to keep to your weekly schedule without relying on memory alone.
GLP Trackr also has a dedicated side-effect tracker, so if you experience nausea, fatigue, or any other symptom, you can log it and watch for patterns over time. This kind of record can be genuinely useful to bring to an appointment — the app even generates a doctor report you can share with your prescriber to support those conversations.
The bigger picture
Weight, mood, energy, sleep, and food intake all interact on a GLP-1 journey. The daily check-in captures all of these in around 30 seconds, feeding into insights that help you understand what is — and is not — moving your results.
For a deeper look at the science behind how Mounjaro and similar medicines work in the body, visit our hub on how Mounjaro works. You may also find the page on what a GLP-1 receptor agonist is a useful companion read.
GLP Trackr is a tracking and journaling app — it is not a substitute for the advice of your prescriber or doctor, and any questions about your dose, side effects, or suitability should always go to them first.
If you would like a single place to log your doses, track how you feel, and see your progress build week by week, GLP Trackr is free to try. Download it on the App Store or Google Play and start a 7-day free trial.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
Everything your GLP-1 journey needs. Free to try for 7 days.
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.
Exercise & Steps
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.
Never Forget a Dose Again.
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.
Watch Your Body Transform, Week by Week.
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.
You're Not on This Journey Alone.
Connect with thousands of real GLP-1 users sharing their wins, side effect tips, and meal ideas. Get the support of people who truly get it — because they're living it too.
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- Golden Dose Finder AI
- Medication Clock — real-time level tracking
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The Most Advanced GLP-1 Brain Ever Built.
The first AI built exclusively for GLP-1 weight loss. Every insight, every meal plan, every prediction trained on one thing only: helping you get the most out of your medication.
Knows Your Cycle
GLPIQ tracks where you are in your injection cycle and adjusts everything around it: lighter meals on nausea days, higher protein when appetite returns, and smarter targets as your medication level shifts.
Predicts Before You Feel It
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.
Finds Your Golden Dose
GLPIQ analyses every dose you've been on: weight loss rate, side effects, food noise, mood, protein adherence and tells you which dose gave you the best results. No other app does this.
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Frequently asked questions.
Mounjaro (tirzepatide) is a prescription-only medicine used for weight management in adults, alongside a reduced-calorie diet and physical activity. It is prescribed by a qualified healthcare professional based on individual clinical criteria — not everyone will be suitable.
Mounjaro is a dual GIP and GLP-1 receptor agonist. It acts on two appetite-regulating hormone pathways in the body. It is not insulin, and it is not a stimulant or a cosmetic treatment.
Commonly reported side effects include nausea, constipation, diarrhoea, indigestion, and fatigue, particularly early in treatment or after a dose adjustment. Experience varies between individuals. If side effects are severe, persistent, or worrying, contact your healthcare professional promptly.
No. Mounjaro (tirzepatide) is not insulin. It is a GIP and GLP-1 receptor agonist that works on appetite-regulating pathways. It is a separate class of medicine with a different mechanism of action.
GLP Trackr lets you log each injection, set weekly dose reminders, track side effects over time, and record weight and wellbeing data. It is a companion app for people already prescribed Mounjaro — not a medical service or prescriber.