Injection Sites, Rotation, and Why It Matters
Both Mounjaro and Wegovy are administered as subcutaneous injections — delivered just beneath the skin — typically once a week. The three most commonly used sites are the abdomen (stomach area), the front of the thigh, and the upper arm. Your prescriber or doctor will advise which sites are appropriate for you and show you how to use the pen device correctly; always follow their guidance and read the patient information leaflet supplied with your medicine.
Why rotation is important
Using the same spot repeatedly can cause a build-up of fatty tissue under the skin, known as lipohypertrophy. This can affect how the medicine is absorbed, which may influence how consistently it works. Rotating between different areas — and moving within each area — helps keep skin tissue healthy and absorption more predictable.
Practical points to keep in mind
- Allow a reasonable gap between injection spots within the same area each week — check your patient information leaflet for the guidance specific to your medicine.
- Avoid injecting into skin that is bruised, irritated, scarred, or has signs of a previous reaction.
- If you experience persistent redness, swelling, or pain at an injection site, mention it to your prescriber or doctor.
For a broader overview of how these medicines work and general guidance on the injection journey, see our guide to 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.
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
Keeping track of which site you injected last — and when — is surprisingly easy to lose track of across a weekly schedule. GLP Trackr's injection-site tracking feature logs each site you use and suggests your next rotation automatically, so you never have to try to remember whether it was the left thigh or the right abdomen last Tuesday.
Alongside site rotation, the app logs each dose with its date, time, and strength in one place. Combined with dose reminders, this means your weekly schedule stays consistent — a small habit that can make a real difference over months of treatment.
If you notice any injection-site reactions or other side effects, you can log those too and build a picture of your own patterns over time. That record can be genuinely useful to bring to your next appointment — your prescriber or doctor is always the right person to advise on anything that concerns you.
Questions about what you are paying for your treatment, or how costs compare, are worth raising with your prescriber or a registered pharmacy in your country — you may also find our pages on weight loss injection costs and finding value from your prescription useful background reading.
Ready to take the guesswork out of injection tracking? Download GLP Trackr on the App Store or Google Play and get your first seven days free — log your sites, set your weekly reminder, and let the app handle the rotation for you.
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 three most commonly used injection sites are the abdomen, the front of the thigh, and the upper arm. Your prescriber or doctor will confirm which sites are suitable for you. Always follow the guidance in the patient information leaflet supplied with your medicine.
Rotating sites helps prevent lipohypertrophy — a build-up of fatty tissue that can develop if the same spot is used repeatedly. This tissue change may affect how consistently the medicine is absorbed, so moving between areas each week is generally recommended.
Yes. Medicines such as Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only in Germany, as they are in most countries. They must be obtained through a licensed prescriber and a registered pharmacy. GLP Trackr does not sell, supply, or source any medicine.
GLP Trackr logs each injection — recording the site, date, time, and dose — and suggests your next rotation site automatically. It also sends dose reminders so your weekly schedule stays on track. The app is available free for a 7-day trial on the App Store and Google Play.