Understanding the Two Main Prescribed Weight Loss Injections
Mounjaro and Wegovy are currently the two most widely prescribed injectable medicines for weight management. Here is what is factually known about each — without endorsing one over the other.
Mounjaro (tirzepatide)
Mounjaro contains tirzepatide, which acts on two appetite-regulating pathways: GLP-1 (glucagon-like peptide-1) and GIP (glucose-dependent insulinotropic polypeptide). It is given as a once-weekly subcutaneous injection. Available dose strengths are typically 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg, with the starting dose and any adjustments determined by your prescriber.
Wegovy (semaglutide)
Wegovy contains semaglutide, a GLP-1 receptor agonist. It is also a once-weekly subcutaneous injection. Common dose strengths are 0.25 mg, 0.5 mg, 1 mg, 1.7 mg, and 2.4 mg, again with titration managed by your prescriber over time.
What they have in common
- Both are prescription-only medicines — neither can be obtained without a prescription.
- Both work on appetite-regulating pathways and are commonly associated with a reduced sense of hunger.
- Both are injected once a week, with rotation across different body sites.
- Neither is suitable for everyone; your prescriber decides which, if any, is appropriate for you.
For a broader look at how these medicines compare side by side, see our guide on weight loss injections: an overview. You may also find it useful to read about which weight loss injection is considered safest and explore further detail in our related pages on choosing the right weight loss injection and what to discuss with your prescriber about injection choices.
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 Whichever Injection You Have Been Prescribed
Once your prescriber has decided which injection is right for you, getting the most from your treatment comes down to consistency — and that starts with never losing track of your injection schedule or sites.
GLP Trackr's injection-site tracking and rotation feature is built specifically for this. Each time you inject, you log the site — abdomen, thigh, or upper arm — and the app keeps a rotation history so it can suggest your next site automatically. Rotating sites properly is generally recommended to look after the skin, and having an automatic prompt removes the guesswork entirely.
Alongside site tracking, the app logs each dose's date, time, and strength, and sends gentle dose reminders so your weekly schedule stays on track. If you ever miss a dose, you can log that too and bring a clear record to your next prescriber appointment — any decision about what to do after a missed dose should always be made with your healthcare professional, not on your own.
For anyone navigating the early stages of treatment — or wondering how their chosen medicine is working for them — having a documented record of every injection, alongside weight, mood, and side-effect logs, gives you something concrete to discuss with your prescriber. GLP Trackr brings all of that into one place.
Always follow the guidance of your prescriber or doctor. If you experience any symptoms that feel severe, persistent, or unusual, contact your healthcare professional promptly rather than adjusting anything yourself.
Ready to stay on top of your injection schedule? Download GLP Trackr on the App Store or Google Play and start a free 7-day trial — log your first injection today.
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.
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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.
There is no universal answer. Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescribed for weight management, and the most appropriate choice depends on your individual health profile. Your prescriber or doctor is the right person to make that decision with you.
Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors. Wegovy contains semaglutide, which acts on GLP-1 receptors. Both are once-weekly injectables prescribed for weight management. The clinical difference that matters to you is best discussed with your prescriber.
Any decision to switch prescription medicines must be made with your prescriber or doctor. They will consider your health history, how you have responded to your current medicine, and whether a change is appropriate. Never stop or switch medication without their guidance.
GLP Trackr lets you log each injection — recording the dose, date, time, and site — and tracks your rotation history to suggest your next site. Dose reminders help keep your weekly schedule consistent, and all your data can be reviewed with your prescriber.
Both Mounjaro and Wegovy are prescription-only medicines approved by regulators for eligible individuals. Suitability and safety for you personally is assessed by your prescriber. If you experience any concerning symptoms, contact your healthcare professional promptly.