What is the weight loss jab and how does it act in the body?
The term "weight loss jab" typically refers to a class of prescription medicines called GLP-1 receptor agonists. Wegovy contains semaglutide, which acts on GLP-1 receptors involved in appetite and blood sugar regulation. Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist, meaning it acts on two of these hormone pathways. For a factual overview of how semaglutide works, NHS guidance on semaglutide is a reliable starting point.
What these medicines are commonly reported to do
Many people taking these medicines report a reduced appetite, a greater sense of fullness after smaller amounts of food, and a quietening of constant thoughts about eating. Slower gastric emptying — meaning food moves through the stomach more gradually — is also a commonly described effect, though this often lessens over time. These are general patterns; individual responses vary, and your prescriber is best placed to set realistic expectations for your own journey.
What the weight loss jab is not
These medicines are not a quick fix, not suitable for everyone, and not a substitute for the dietary and lifestyle support your prescriber will recommend alongside treatment. Suitability is always a clinical decision. If you are looking for more detail on what the weight loss jab does in practice, or want background on the weight loss jab more broadly, those pages cover both topics in depth.
Common questions about access and safety
Many people searching this topic also want to know whether the weight loss jab is safe, whether they can have it, and how it is accessed. Safety and suitability are individual — your prescriber or doctor will review your health history before prescribing. These medicines are available only via a prescriber and a registered pharmacy; how that works depends on your country and healthcare arrangements. GLP Trackr does not sell, supply, or source any medication. If you are wondering about what the weight loss injection involves in terms of practical considerations, or have heard about supply pressures affecting the weight loss jab, those pages address those topics directly.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking your weight loss jab journey with GLP Trackr
Once you are prescribed the weight loss jab, keeping a clear record of your injections is one of the most practical things you can do. GLP Trackr is built specifically for people already on Mounjaro or Wegovy, and its injection-site tracking and rotation feature is a natural starting point: log each injection — site (abdomen, thigh, or upper arm), date, and dose strength — and the app suggests your next rotation site automatically, so you never have to remember where you last injected.
Alongside site tracking, dose reminders mean a weekly injection is far less likely to slip your mind, and the side-effect log lets you record how you feel after each dose — useful information to bring to your next prescriber appointment rather than trying to recall it from memory. The app also brings together weight, mood, energy, and food data so you can see your whole journey, not just individual data points. You can explore all of this in the broader guide to weight loss injections and tracking.
If you experience any symptoms that feel severe, persistent, or out of the ordinary after an injection, contact your healthcare professional promptly — GLP Trackr helps you record what you are experiencing, but it is not a substitute for clinical advice, and any concerns about your treatment should always be discussed with your prescriber or doctor.
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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 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.
The two most commonly prescribed weight loss jabs are Wegovy (semaglutide) and Mounjaro (tirzepatide). Both are prescription-only, once-weekly injectable medicines that act on appetite-regulating hormones. Your prescriber will advise which, if either, is appropriate for you.
These medicines act on GLP-1 hormone receptors — and in the case of tirzepatide, also GIP receptors — to reduce appetite, increase feelings of fullness, and slow gastric emptying. Many people report reduced hunger and less preoccupation with food, though individual responses vary.
Safety and suitability are individual clinical decisions. Your prescriber or doctor will assess your health history before prescribing. Like all medicines, these can cause side effects. Always discuss any concerns with your healthcare professional, and report side effects to your national reporting scheme (such as the UK's Yellow Card scheme).
Whether you are suitable for a weight loss jab is a decision for your prescriber or doctor, based on your individual health circumstances. These medicines are prescription-only and not appropriate for everyone. Your healthcare professional is the right person to advise on eligibility.
Results vary between individuals. Many people experience meaningful appetite reduction and weight changes, but outcomes depend on a range of factors including lifestyle, adherence, and individual response. No medicine works identically for everyone — your prescriber can give you realistic expectations for your situation.