What Are Weight Loss Injection Medicines?
Mounjaro and Wegovy are prescription-only, once-weekly injectable medicines. Mounjaro contains tirzepatide, which acts on both GIP and GLP-1 receptors involved in appetite regulation. Wegovy contains semaglutide, a GLP-1 receptor agonist. Both are supplied as pre-filled pens and are started at a low dose, with any adjustments made by your prescriber over time.
Because these are prescription-only medicines, they are not available without a prescription from a qualified healthcare professional. Anyone researching weight loss jabs for the first time should speak with their doctor or prescriber to find out whether either medicine is appropriate for them — suitability is an individual clinical decision.
Where injections are given
Both medicines are typically injected into the subcutaneous (fatty) tissue. Common sites include the abdomen, the front of the thigh, and the upper arm. Your prescriber or the patient information leaflet that came with your pen will guide you on the technique that is right for you.
Why injection-site rotation matters
Rotating the injection site each week helps reduce the risk of skin reactions or tissue changes at any one area. Most prescribers recommend moving around the same general region (for example, different spots on the abdomen) or alternating between regions entirely. If you want to read more about how Mounjaro is used in practice, the page on Mounjaro as a weight loss injection covers this in more detail, and our guide to weight loss injections gives a broader overview of the topic.
It is worth noting that both Mounjaro and Wegovy carry a black triangle (▼) status in some countries, meaning they are subject to additional monitoring. Report any side effects to your healthcare professional and, if applicable, to your national reporting scheme (such as the UK's Yellow Card scheme).
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.
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How GLP Trackr Helps You Stay on Top of Your Injections
Keeping track of which site you injected last week — and whether it is time to switch — is easy to forget across a long course of treatment. GLP Trackr's injection-site tracking feature logs every injection you record, including the site (abdomen, thigh, or arm), and suggests your next rotation automatically, so you never have to rely on memory alone.
Alongside site tracking, the app logs the dose strength and date of each injection, giving you a clear history of your treatment at a glance. Dose reminders help make sure a weekly shot does not slip by unnoticed — consistency matters on a once-weekly schedule.
If you ever need to discuss your injection history with your prescriber — perhaps at a review appointment or if something has changed — you can pull up a clear record directly from the app. GLP Trackr is a companion tool, not a substitute for your prescriber's guidance; any concerns about your injection technique, site reactions, or schedule should always go to your healthcare professional.
You can also explore information on how weight loss jabs are accessed through pharmacies and healthcare services if you have questions about your supply.
Ready to bring some order to your weekly injection routine? Download GLP Trackr on the App Store or Google Play and try it free for seven days — log your first shot, set a rotation, and see how straightforward it can be.
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.
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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 two widely prescribed once-weekly injectable medicines for weight management. Both are prescription-only and are obtained through a qualified prescriber, not over the counter.
Common injection sites include the abdomen, front of the thigh, and upper arm. Your prescriber or the patient information leaflet supplied with your pen will advise on the correct technique and site for you personally.
Rotating sites each week helps reduce the chance of skin reactions or tissue changes building up in one area. Most prescribers recommend moving to a different spot or region with each injection. Your healthcare professional can advise on the best rotation pattern for you.
Mounjaro and Wegovy are prescription-only medicines. They should only be obtained through a registered prescriber and pharmacy. GLP Trackr does not sell, supply, or help source any medication.
GLP Trackr lets you log each injection's date, dose strength, and site, then suggests your next rotation automatically. It also sends dose reminders so a weekly shot is never forgotten, and keeps a history you can share with your prescriber.