How These Injections Work and What to Expect
Both Mounjaro and Wegovy are once-weekly injectable medicines. Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors involved in appetite regulation. Wegovy contains semaglutide, which acts on GLP-1 receptors. Many people prescribed these medicines report reduced appetite, a lower sense of food noise, and increased feelings of fullness after meals — effects that can support weight management alongside a prescribed treatment plan.
Injection sites and rotation
These medicines are typically injected subcutaneously — under the skin — into one of three areas: the abdomen, the front of the thigh, or the upper arm. Rotating between sites is generally recommended to reduce the chance of skin irritation or changes at any one spot. Your prescriber or doctor, along with the patient information leaflet that comes with your pen, will guide you on the technique that is right for you.
Starting doses and titration
Both medicines are typically started at a low dose and adjusted over time, with any changes directed by your prescriber. This gradual approach is intended to help your body adjust. Any decision about your dose or how it progresses belongs entirely with your prescriber — never adjust it on your own.
For a broader overview of how injectable weight loss medicines work, see our guide to weight loss injections. You may also find it useful to read about injections for weight loss more generally, or explore information on weight loss injections for men if that is relevant to your situation.
According to guidance from the electronic Medicines Compendium, both tirzepatide and semaglutide are prescription-only medicines to be used under clinical supervision — always follow the individual product information supplied with your pen.
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.
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Tracking Your Injection Journey with GLP Trackr
Staying consistent with a once-weekly injection and rotating sites reliably is easier when you have a clear record. GLP Trackr is built specifically for people already on Mounjaro or Wegovy, and its injection-site tracking is one of its most practical features for this journey.
Site rotation you can actually keep up with
Each time you inject, you can log the site you used — abdomen, thigh, or arm — and GLP Trackr tracks your rotation history and suggests where to inject next. Over weeks, this turns what can be a hard-to-remember routine into something automatic, helping you avoid overusing any single area.
Dose logging and reminders
The app also lets you record each dose with its date, time, and strength, so you always have a clear picture of where you are in your treatment schedule. Gentle reminders mean a weekly dose is far less likely to slip by unnoticed — particularly useful during the early weeks when the routine is still new.
If you experience any side effects or changes in how you feel, GLP Trackr's side-effect log lets you record symptoms and spot patterns over time — information that can be genuinely useful to bring to your next prescriber appointment.
Safety note: if you experience symptoms that are severe, persistent, or concern you at any point during your treatment, contact your healthcare professional promptly. GLP Trackr is a tracking tool — it is not a substitute for clinical guidance, and all decisions about your treatment should be made with your prescriber.
To learn more about injection tracking and what the app can do, visit the weight loss injections hub.
Log your injection sites, track your rotation, and keep your weekly schedule on track — GLP Trackr is free to try for 7 days on the App Store and Google Play.
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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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.
Medicines such as Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only injections that some people with type 2 diabetes or related conditions are prescribed. Suitability is assessed by a prescriber and depends on individual health circumstances.
These medicines are typically injected under the skin in the abdomen, front of the thigh, or upper arm. Rotating between sites is generally recommended. Your prescriber and the patient information leaflet supplied with your pen will advise on the correct technique for you.
Yes, rotating injection sites is generally recommended to help reduce irritation or skin changes at any one area. Your prescriber or the information leaflet with your pen will provide guidance on how to rotate effectively.
GLP Trackr lets you log each injection with its date, time, dose strength, and site. The app tracks your rotation history and suggests your next site, and dose reminders help you stay on your weekly schedule.
Always follow the guidance of your prescriber or doctor — they know your full medical history. If you experience symptoms that are severe, persistent, or worrying, contact your healthcare professional promptly rather than adjusting your treatment yourself.