What Are the Main Prescription Weight Loss Injections?
Prescription injectable medicines for weight management currently centre on two options: Mounjaro (tirzepatide) and Wegovy (semaglutide). Both are given as once-weekly injections using pre-filled pens, and both require a valid prescription from a healthcare professional.
Mounjaro (tirzepatide)
Tirzepatide is a dual GIP and GLP-1 receptor agonist. It acts on two appetite-regulating pathways, which commonly results in reduced appetite and an increased sense of fullness. Doses typically start low and are adjusted over time by the prescriber. Whether tirzepatide is suitable for a specific individual — including those with conditions such as PCOS, pre-diabetes, or those going through the menopause — is a clinical decision.
Wegovy (semaglutide)
Semaglutide is a GLP-1 receptor agonist that similarly acts on appetite-signalling pathways. Like tirzepatide, it is started at a lower dose and titrated upward under prescriber guidance. Both medicines carry additional monitoring requirements; any side effects should be reported to your healthcare professional and to your national reporting scheme (such as the UK's Yellow Card scheme).
A note on "best" for specific conditions
Searches for the best weight loss injection for menopause, PCOS, or pre-diabetes are understandable — these are real concerns. However, which medicine, if any, is appropriate given your specific health picture is a question for your prescriber or doctor, not a content page. What matters is finding a qualified provider and discussing your full history with them.
If you are exploring your options, our overview of prescription weight loss injections covers the landscape in more detail. You may also find the guide to how weight loss injections work useful background reading before a prescriber appointment.
For context on how people already on these medicines think about the journey, see our page on commonly asked questions about weight loss injections.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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How GLP Trackr Helps Once You Are Prescribed
GLP Trackr is a companion app built specifically for people already taking Mounjaro or Wegovy — it is not a pharmacy, prescriber, or medical service. Once you have your prescription, the app is designed to help you stay consistent and get the most from your journey.
Injection-site tracking and rotation
The most relevant feature for injection users is site logging. Each time you inject, you can record which area you used — abdomen, thigh, or upper arm — and GLP Trackr tracks your rotation history and suggests your next site automatically. Rotating injection sites is generally recommended to avoid irritation, and having a log means you never have to rely on memory.
Dose logging and reminders
The app also lets you log each dose with its date, time, and strength, so your full injection history is always in one place. Gentle weekly reminders mean a dose is far less likely to be forgotten — useful when a once-weekly schedule can blur into a busy life.
Bringing your data to appointments
If you are discussing how the treatment is going with your prescriber — including any side effects or concerns — GLP Trackr's doctor report feature lets you take a clear summary of your logged journey into that conversation. The app records; your prescriber advises. Any questions about which injection is right for you, or whether your current prescription is working, should always go to your healthcare professional.
If you are still at the stage of understanding how to access a prescription, the page on obtaining a weight loss injection explains what that process generally involves.
Ready to stay on top of your injection schedule? Log your sites, track your rotation, and keep your dose history tidy — GLP Trackr is free to try for 7 days 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.
Mounjaro (tirzepatide) and Wegovy (semaglutide) are the main prescription weight loss injections currently available. Neither is universally "best" — suitability depends on your individual health history, and the right choice is a decision for your prescriber or doctor.
Both tirzepatide and semaglutide are sometimes prescribed for people with these conditions, but which medicine is appropriate for you depends on your full medical picture. This is a clinical decision that should be made with your prescriber, not based on a general recommendation.
Both Mounjaro and Wegovy come as pre-filled, once-weekly injectable pens. Specific pen handling and storage guidance is provided in the patient information leaflet that comes with your medicine — always follow that leaflet and any instructions from your prescriber.
GLP Trackr lets you log each injection — date, dose strength, and site — and tracks your rotation history so the app can suggest where to inject next. It also sends dose reminders and stores your full injection history for easy reference at prescriber appointments.
All prescription medicines can have side effects. Both Mounjaro and Wegovy commonly involve gastrointestinal effects such as nausea. If you experience side effects, log them and discuss with your prescriber or doctor — they can advise on management based on your individual situation.