Understanding the Two Main Weight Loss Injections
Mounjaro and Wegovy are both prescription-only, once-weekly injectable medicines. They work through different but related mechanisms:
- Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist. It acts on two appetite-regulating pathways and is supplied as a pre-filled pen. Commonly referenced dose strengths include 2.5 mg up to 15 mg, with adjustments made by the prescriber over time.
- Wegovy (semaglutide) is a GLP-1 receptor agonist, also supplied as a pre-filled pen. Dose strengths range from 0.25 mg up to 2.4 mg, again titrated under prescriber guidance.
Both medicines act on appetite-regulating pathways in the brain, and many people using them report reduced hunger and a lower sense of food noise. Effects vary between individuals, and neither medicine is suitable for everyone — suitability is always assessed by a prescriber.
It is worth noting that these are not the same as insulin and are not a cosmetic quick fix. They are prescription medicines intended to be used alongside dietary changes and clinical supervision.
For a fuller look at how these medicines compare on a factual basis, see our overview of the best weight loss injections or explore what the best weight loss injections actually are. You can also read more about which weight loss injection may suit different needs — though any final decision always belongs with your prescriber.
For factual reference information on these medicines, the electronic Medicines Compendium (eMC) publishes the full patient information for both Mounjaro and Wegovy.
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.
Point your camera at any meal and let our AI do the rest. Breakfast, doses, weight, mood all tracked in seconds.
How GLP Trackr Helps You Stay on Top of Your Injections
Once you have been prescribed one of these medicines, the practical challenge becomes consistency — remembering your weekly injection, rotating your injection sites correctly, and keeping a clear record to discuss with your prescriber. That is exactly where GLP Trackr is built to help.
Injection-site tracking and rotation
GLP Trackr lets you log each injection site — abdomen, thigh, or upper arm — and tracks your rotation history automatically. After each entry, the app suggests your next site, so you never have to try to remember where you last injected. Rotating sites is generally recommended to support skin and tissue health, and having a record makes it simple to stay on top of.
Dose and schedule logging
Every dose you take can be logged with its date, time, and strength. GLP Trackr also sends gentle reminders so a weekly injection does not slip through the gap in a busy week. If you do miss a dose, the app can help you record it — but any decision about what to do next should be discussed with your prescriber or doctor, not acted on alone.
Bringing your data to appointments
The app's doctor report feature lets you bring a clear summary of your injection history, any side effects you have logged, and your wider progress to your next prescriber appointment. It turns scattered notes into a useful conversation.
Always follow the guidance of your prescriber or doctor — they know your full medical history and are the right person to advise on your treatment. GLP Trackr supports your journey; it does not replace clinical care.
For a broader guide to managing your injectable treatment, visit our weight loss injections hub.
Ready to keep your injection schedule effortlessly on track? Download GLP Trackr on the App Store or Google Play and start a free 7-day trial — your injection history, site rotation, and weekly reminders all in one place.
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.
Download on the App Store Download on the Google Play
Founding Member Offer
One plan. Everything included. No hidden extras.
Founding Member
Exclusive Offer
Join the first 1,000 membersand lock in our lowest ever price
Offer expires in:
786 of 1000 founding spots remaining
50% OFF
Lifetime Price Lock
Never pay full price • Forever
🔒 No credit card required • Cancel anytime
Premium
Ad-free- Track weight, meals, water, exercise, & sleep
- Log doses, injection sites, & side effects
- 60-second daily morning check-in
- AI meal scanning & barcode scanning
- Personalised AI meal plans & recipes
- Golden Dose Finder AI
- Medication Clock — real-time level tracking
- Daily Brief and predictive side effects
- Full insights & weekly transformation cards
- Unlimited progress photos
- Doctor PDF export & body measurements
- Community Access—Connect with GLP-1 users
Powered by
🔒 No credit card required • Cancel anytime
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.
Download glptrackr today.
Available on iOS and Android. 7-day free trial, no credit card needed.
Frequently asked questions.
The two most widely prescribed weight loss injections are Mounjaro (tirzepatide) and Wegovy (semaglutide). Both are once-weekly prescription-only medicines. Which is appropriate for any individual is a decision for their prescriber or doctor, based on personal health circumstances.
Rotating injection sites is generally recommended when using injectable medicines like Mounjaro or Wegovy. Common sites include the abdomen, thigh, and upper arm. Your prescriber or the patient information leaflet that came with your pen will give guidance specific to your medicine.
This is a question for your prescriber or doctor, not one that can be answered generally. Mounjaro acts on both GIP and GLP-1 pathways; Wegovy acts on GLP-1. Both are prescription medicines and suitability depends entirely on your individual health history and circumstances.
GLP Trackr lets you log each injection — site, dose strength, date, and time — and tracks your rotation history so it can suggest your next site. It also sends weekly reminders and lets you record any side effects to discuss with your prescriber.
Any decision about a missed dose should be made with your prescriber or doctor — never on your own. GLP Trackr can help you log a missed dose so you have an accurate record to discuss at your next appointment. Always refer to your patient information leaflet or contact your healthcare professional promptly.