Tirzepatide: What It Is and How It Works
Tirzepatide is a dual GIP (glucose-dependent insulinotropic polypeptide) and GLP-1 (glucagon-like peptide-1) receptor agonist. In plain terms, it mimics two naturally occurring gut hormones that play a role in regulating appetite, blood sugar, and the speed at which the stomach empties. Most people find this combination leads to a reduced sense of hunger and decreased "food noise" — though individual responses vary.
By contrast, the active ingredient in Wegovy is semaglutide, which acts on the GLP-1 receptor only, making it a single receptor agonist. Both tirzepatide and semaglutide belong to the broader category of weight-loss injections whose active ingredients target appetite-regulating pathways, but their mechanisms differ — something worth discussing with your prescriber if you have questions about your specific prescription.
Mounjaro as a prescription medicine
Mounjaro is a prescription-only, once-weekly injectable medicine. It is supplied as a pre-filled pen device and is typically started at a low dose, with any adjustments made by your prescriber over time — never independently. Because it carries additional monitoring status, any side effects should be reported to your healthcare professional and to your national pharmacovigilance scheme (such as the UK's Yellow Card scheme).
For a closer look at everything that goes into the pen alongside tirzepatide, see the full Mounjaro ingredients overview and the detailed Mounjaro ingredients list, which covers excipients and inactive components. You can also explore what is in Mounjaro for a broader breakdown of the formulation.
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.
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Tracking Your Tirzepatide Journey with GLP Trackr
Knowing the active ingredient in your medicine is a useful starting point — but staying consistent week to week is where many people find a companion app genuinely helpful. GLP Trackr's dose logging feature lets you record each injection, including the dose strength and date, so you always have an accurate record of where you are in your treatment schedule. That log can be particularly useful to bring to prescriber appointments as part of the app's doctor report, giving your clinician a clear picture of your adherence and any patterns you have noticed.
Side-effect tracking is built in too: if tirzepatide causes nausea, fatigue, or other commonly reported effects, you can log them and watch for patterns over time — turning a vague sense of "this is happening" into concrete data to discuss with your healthcare professional.
GLP Trackr is designed for people already prescribed Mounjaro or Wegovy, wherever in the world they are. It does not provide medical advice, and any questions about your dose or treatment should always go to your prescriber or doctor. The app is there to support your journey, not replace clinical guidance.
Ready to keep better track of your tirzepatide treatment? Download GLP Trackr on the App Store or Google Play — your first seven days are completely free. Learn more about tracking your Mounjaro journey.
What does glptrackr include?
10+ powerful features. One app. Built specifically for Mounjaro and Wegovy users.
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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.
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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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.
The active ingredient in Mounjaro is tirzepatide, a dual GIP and GLP-1 receptor agonist. It works by mimicking two gut hormones involved in appetite regulation and blood sugar control. Mounjaro is a prescription-only medicine and should only be used under the guidance of a prescriber.
The active ingredient in Wegovy is semaglutide, a GLP-1 receptor agonist. Unlike tirzepatide (Mounjaro), semaglutide acts on a single receptor pathway. Both are prescription-only injectable medicines; your prescriber will determine which is appropriate for you.
Tirzepatide (Mounjaro) activates both GIP and GLP-1 receptors, while semaglutide (Wegovy) targets GLP-1 receptors only. Both are once-weekly injections used for weight management under medical supervision. Any questions about which medicine is right for you should be discussed with your prescriber or doctor.
No. Tirzepatide is not insulin. It is a dual GIP and GLP-1 receptor agonist that works on appetite-regulating pathways. It is a distinct class of medicine. Always follow your prescriber's guidance regarding your specific treatment.
Yes. GLP Trackr lets you log each Mounjaro injection — including dose strength, date, and time — so you have an accurate record to share with your prescriber. The app is designed for people already prescribed Mounjaro or Wegovy and does not provide medical or dosing advice.