What Are Prescription Slimming Injections?
Mounjaro and Wegovy are the two main prescription slimming injections currently available. Both are administered once a week using a pre-filled pen and are prescription-only medicines — meaning they can only be obtained through a registered prescriber and pharmacy. They are not available over the counter.
How They Work
Wegovy contains semaglutide, a GLP-1 receptor agonist. Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors. Both medicines work on appetite-regulating pathways in the brain and gut, commonly producing a greater sense of fullness and reduced appetite. Slower stomach emptying is also frequently reported, though this effect often eases over time. These are prescription medicines and their suitability for any individual is a decision made by a prescriber — not something to self-determine.
Injection Sites and Rotation
Both pens are injected into the fatty tissue just beneath the skin. The most commonly used sites are the abdomen, the front of the thigh, and the upper arm. Rotating between sites each week is generally recommended to allow the skin and tissue to recover. Your prescriber or the patient information leaflet that came with your pen will give you the most relevant guidance for your situation. For a broader overview of these medicines and how people manage their weekly routine, see our guide to weight loss injections.
Access and Prescribing
In many countries, including the UK, these medicines are available through private prescribers as well as, in certain circumstances, through publicly funded healthcare. Eligibility criteria vary significantly depending on your healthcare provider and location. For information specifically about accessing these medicines through publicly funded routes, our page on slimming injections and NHS access covers what is generally known. For a wider comparison of available options, you may also find our overview of prescription weight loss injections useful.
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.
Tracking Your Slimming Injection Journey with GLP Trackr
Once you are prescribed a slimming injection, keeping track of each dose — which site you used, when you injected, and how you felt afterwards — becomes an important part of managing your weekly routine well. That is exactly what GLP Trackr is built for.
Injection Site Rotation — Handled for You
GLP Trackr lets you log each injection as you go: the date, dose strength, and the site you used. The app tracks your rotation history and suggests where to inject next, so you never have to remember manually. Over time, you build a clear record of every shot you have taken — useful both for your own awareness and for conversations with your prescriber.
Side-Effect and Progress Logging
Many people on prescription slimming injections experience side effects, particularly in the early weeks or after a dose adjustment. GLP Trackr includes a side-effect tracker so you can log symptoms like nausea, fatigue, or digestive changes as they happen and spot patterns over time. Combined with weekly weight and body measurements, this gives you a fuller picture of your journey than the scale alone. You can also bring a summary of your logged data to your next prescriber appointment.
If you want to understand more about what other people track during their injection journey, our page on slimming injections covers common experiences and questions.
Important: GLP Trackr is a tracking and journaling app — it is not a medical service and does not provide clinical advice. Any questions about your dose, injection technique, or how you are feeling should be directed to your prescriber or doctor. If you experience symptoms that are severe, persistent, or worrying, contact a healthcare professional promptly.
Ready to take the guesswork out of injection tracking? Download GLP Trackr on the App Store or Google Play and start your free 7-day trial — log your first shot today and let the app handle your rotation from there.
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 main prescription slimming injections are Mounjaro (tirzepatide) and Wegovy (semaglutide). Both are once-weekly injectable medicines available only via a registered prescriber and pharmacy. They act on appetite-regulating pathways and are not available without a prescription.
Common injection sites are the abdomen, front of the thigh, and upper arm. Rotating between sites each week is generally recommended to help skin and tissue recover. Your prescriber or the patient information leaflet supplied with your pen is the best guide for your individual situation.
Yes, rotating injection sites is generally advised so the same area is not used repeatedly. GLP Trackr can log each site you use and suggest your next rotation automatically, removing the need to remember manually.
Yes. GLP Trackr lets you log each injection — date, dose strength, and site used — and tracks your rotation history. It also includes side-effect logging, weight tracking, and a summary you can share with your prescriber. It is available free for 7 days on iOS and Android.
Any concerns about your dose, side effects, or how the medicine is affecting you should be discussed with your prescriber or doctor. If symptoms are severe or persistent, contact a healthcare professional promptly. The app helps you log what you experience so you can discuss it accurately.