How the Mounjaro injection works in practice
Mounjaro is supplied as a pre-filled pen and is administered as a subcutaneous injection — meaning it goes into the fatty tissue just beneath the skin, not into a vein or muscle. Your prescriber or doctor, along with the patient information leaflet supplied with your pen, will guide you on the exact technique that is right for you; that clinical detail is theirs to provide, not something to navigate from a website.
Injection sites and why rotation matters
The three sites most commonly used are the abdomen (at least a few centimetres from the navel), the front or outer thigh, and the upper arm. Repeatedly injecting the same small patch of skin can lead to localised reactions or changes in the tissue beneath — rotating sites with each weekly dose helps avoid this. Many people find it easy to forget which site they used last week, especially once several months of weekly jabs have accumulated.
What to do with each pen
Each Mounjaro pen is single-use. Storage requirements and shelf life are set out in the leaflet that comes with your prescription — always check that leaflet for the specifics rather than relying on general figures. If you have any questions about how to use or store your pen, your prescriber or pharmacist is the right person to ask.
For a broader overview of injectable weight-loss medicines in general, see our guide to weight loss injections. If you are hearing about Mounjaro for the first time in the context of weight loss jabs more broadly, that page covers the wider landscape. You may also find it useful to read about weight loss jab supply shortages if availability has been a concern for you.
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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How GLP Trackr helps you stay on top of your injections
The feature that tends to make the biggest immediate difference for people on a weekly jab is injection-site tracking. GLP Trackr lets you log each injection — recording the site (abdomen, thigh, or arm), the date, and the dose strength — and then suggests your next rotation site automatically, so you never have to remember where you jabbed three weeks ago.
Alongside site tracking, the app stores your full dose history in one place. If you are ever unsure whether you took this week's dose, or you want a clear record to review with your prescriber, that log is right there. Dose reminders are also built in, so a busy week does not mean a missed injection.
If your prescription came through a funded programme in your country — some national health services, such as those in the UK, have introduced pathways for prescribing Mounjaro for weight management, though eligibility criteria and availability vary — the app is equally useful regardless of how or where you access your medication. For information specifically about funded prescription routes, see our page on NHS weight loss injection programmes.
GLP Trackr is built for people already on Mounjaro or Wegovy, at every stage of their journey. If you have questions about your dose, injection technique, or any symptoms you are experiencing, always follow the guidance of your prescriber or doctor — they have the full picture of your health. The app helps you record and organise your information so those conversations are better informed, not replace them.
Ready to bring your weekly jabs under control? Download GLP Trackr on the App Store or Google Play and try it free for 7 days — your injection history, site rotation, and dose reminders all in one place.
What does glptrackr include?
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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.
Mounjaro is typically injected subcutaneously into one of three sites: the abdomen, the front or outer thigh, or the upper arm. Your prescriber or doctor and the patient information leaflet with your pen will advise on the specific technique that is right for you.
Yes — rotating the injection site with each weekly dose is widely recommended. Using the same small patch repeatedly can cause localised skin or tissue reactions. Keeping a log of where you last injected helps you rotate consistently each week.
Access to Mounjaro for weight management varies by country and by individual eligibility. Some national health services have introduced funded pathways, but criteria differ widely. Your prescriber or doctor is the right person to advise on what is available to you in your location.
It is easy to lose track over many weeks of once-weekly injections. Logging each injection — including the site — in an app like GLP Trackr means the record is always there, and the app can suggest your next rotation site automatically.
Yes. GLP Trackr lets you log each injection with the site, date, and dose strength, tracks your rotation history, and sends dose reminders so you do not miss a weekly jab. It is available free on the App Store and Google Play with a 7-day trial.