Weight Loss Injections on Prescription: The Key Facts
Prescription weight loss injections work by acting on appetite-regulating pathways in the body. Semaglutide (Wegovy) is a GLP-1 receptor agonist, while tirzepatide (Mounjaro) acts on both GLP-1 and GIP receptors. Both are taken as a once-weekly injection using a pre-filled pen, and both are prescription-only medicines — meaning they are only available through a qualified prescriber after a clinical assessment.
How access is typically determined
Whether a weight loss injection is available through a publicly funded healthcare programme or privately depends entirely on the criteria set by your local or national healthcare system. These criteria commonly consider factors such as body mass index (BMI) and the presence of weight-related health conditions, but the specifics vary by country, region, and healthcare provider. Your prescriber or doctor is the right person to explain what applies to your situation.
Understanding the dose journey
These medicines are typically started at a low dose and gradually adjusted over time — always under the guidance of the prescriber who knows your full history. The injection sites most commonly used are the abdomen, outer thigh, or upper arm. Rotating between sites with each injection is generally recommended to reduce the chance of skin reactions at any one spot.
For a broader look at how these medicines work and what to expect from the injection process, see our guide to weight loss injections and our overview of starting a weight loss injection. If you have questions about obtaining your prescription, your prescriber or a registered pharmacy in your country is the appropriate point of contact — for context on that topic, see what to know about accessing weight loss injections.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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How GLP Trackr Helps You Stay on Top of Your Injection Routine
Staying consistent with a weekly injection schedule — and rotating sites correctly — is one of the most practical challenges of this treatment. GLP Trackr is built specifically to make that easier.
The app's injection-site tracking feature lets you log which site you used for each dose (abdomen, thigh, or upper arm) and automatically suggests where to inject next, so rotation becomes something you never have to think hard about. Alongside this, dose logging records the date, time, and dose strength of every injection in one place — useful both for your own peace of mind and for bringing an accurate record to appointments with your prescriber.
If you ever miss a dose, the app can help you log that too, giving you something concrete to discuss with your prescriber rather than trying to recall it from memory. Any decision about what to do after a missed dose belongs with your prescriber or doctor — GLP Trackr records it; it does not advise on it.
You can also set weekly dose reminders so your injection day never quietly slips by during a busy week.
For more on managing your injections and what others on the same journey find helpful, visit our guide to NHS weight loss injections and the main weight loss injections hub.
If you experience any side effects that feel severe, persistent, or worrying, contact your healthcare professional promptly. Any side effects worth noting should also be reported to your national pharmacovigilance scheme — such as the UK's Yellow Card scheme or the equivalent in your country.
Ready to bring order to your injection routine? GLP Trackr's site-rotation tracking and dose reminders are free to try for 7 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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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.
Criteria vary by country, region, and healthcare system — they commonly include BMI thresholds and the presence of weight-related health conditions. Your prescriber or doctor is the right person to explain what applies to your individual situation and local pathway.
The most commonly used sites are the abdomen, outer thigh, and upper arm. Rotating between sites with each injection is generally recommended to reduce localised skin reactions. Your prescriber or the patient information leaflet for your specific medicine can provide further guidance.
Rotation is generally recommended to avoid skin reactions at any single site. GLP Trackr lets you log each injection site and automatically suggests where to inject next, taking the mental effort out of tracking your rotation history.
Any decision about a missed dose belongs with your prescriber or doctor — do not adjust your schedule without their guidance. GLP Trackr can log a missed dose so you have an accurate record to discuss at your next appointment.
No — GLP Trackr supports anyone already prescribed Mounjaro (tirzepatide) or Wegovy (semaglutide), regardless of how or where their prescription was obtained. The app helps with dose logging, site rotation, side-effect tracking, and progress monitoring.