Understanding the Injections People Are Prescribed for Weight Loss
Both Mounjaro and Wegovy are prescription-only, once-weekly injectable medicines. They are not available over the counter, and suitability is assessed by a prescriber — regardless of where in the world you are.
How they work
Wegovy contains semaglutide, a GLP-1 receptor agonist. It acts on appetite-regulating pathways in the brain and slows gastric emptying, which many people experience as reduced hunger and a greater sense of fullness after smaller amounts of food.
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. It activates two distinct appetite-related pathways rather than one. Both medicines are typically started at a low dose and adjusted over time under prescriber supervision.
Neither is universally "best"
Search terms like which is the best injection for weight loss are understandable, but there is no single answer that applies to everyone. Factors such as existing health conditions, other medications, and how your body responds all influence which medicine a prescriber may recommend. The decision belongs with them, not with a search result.
For a deeper look at the options, see our overview of weight-loss injections or read more about comparing weight-loss injection options.
Injection sites and at-home use
Both medicines are designed for self-injection, typically administered into the abdomen, thigh, or upper arm. Your prescriber or the patient information leaflet that came with your pen will guide you on technique. Rotating injection sites — rather than using the same spot repeatedly — is generally recommended to help the skin recover and support consistent absorption. For more on the practical side of injecting, see our guide to using weight-loss injections.
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 Once You Are Already Prescribed
Once you have your prescription, the challenge becomes staying consistent — and that is exactly where GLP Trackr is built to help.
Injection-site tracking and rotation
The most relevant feature for injection users is site logging and automatic rotation suggestions. Each time you inject, you log the site in the app — abdomen, thigh, or upper arm — and GLP Trackr keeps a rotation history so it can suggest where to inject next. Over weeks and months, this takes the guesswork out of rotation entirely.
Dose logging and reminders
The app also logs each dose with the date, time, and strength, giving you a clear record of your treatment schedule. Gentle reminders mean a weekly injection is less likely to be forgotten — especially during the early weeks when the routine is still forming.
If you want to understand more about what makes one injection different from another, the page on what makes the best weight-loss injection covers the key distinctions in more detail.
A record worth bringing to appointments
Because GLP Trackr stores your dose history, side-effect logs, and progress data together, you can bring a clear, organised summary to your next prescriber appointment — useful whether you are just starting out or months into your journey.
Always follow the guidance your prescriber has given you. If you experience any symptoms that feel severe, persistent, or unusual, contact your healthcare professional promptly rather than adjusting anything on your own.
Ready to take the guesswork out of injection-site rotation? GLP Trackr logs every shot and suggests your next site automatically. It is free to try for seven days — available now on the App Store and Google Play.
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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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 most commonly prescribed weight-loss injections are Mounjaro (tirzepatide) and Wegovy (semaglutide). Both are prescription-only, once-weekly medicines. Which is most suitable for any individual depends on personal health factors and is a decision for a prescriber to make, not a general recommendation.
Both Mounjaro and Wegovy are designed for self-injection at home once prescribed. Common injection sites include the abdomen, thigh, and upper arm. Your prescriber and the patient information leaflet supplied with your pen will guide you on technique and safe use.
Rotating injection sites is generally recommended so the skin can recover between doses. Using the same spot repeatedly may cause skin changes that affect how the medicine is absorbed. Your prescriber or patient information leaflet will advise on the best rotation approach for you.
Neither is universally better. Wegovy contains semaglutide (a GLP-1 agonist) and Mounjaro contains tirzepatide (a dual GIP and GLP-1 agonist). Suitability depends on your individual health history and other factors — this is a conversation to have with your prescriber, not a general comparison.
GLP Trackr logs each injection — recording the date, dose strength, and site — and tracks your rotation history to suggest where to inject next. It also sends dose reminders and stores your full injection record so you can share it with your prescriber at appointments.