What the evidence says about safety
Both Mounjaro and Wegovy are prescription-only medicines approved by medicines regulators after extensive clinical trials. They are not available without a prescription precisely because suitability must be assessed by a qualified healthcare professional for each individual.
Commonly reported side effects
The most frequently reported side effects are gastrointestinal — nausea, constipation, diarrhoea, indigestion, and reflux. These are most common when starting or after a dose adjustment, and many people find they ease as the body settles. Fatigue, headache, dizziness, and mild injection-site reactions are also commonly noted.
When to seek help promptly
Certain symptoms warrant contacting a healthcare professional without delay — these include severe or persistent abdominal pain, persistent vomiting, signs of an allergic reaction, or any symptom that feels serious or out of the ordinary. If you experience anything that concerns you, reach out to your prescriber or doctor rather than waiting. Both medicines carry a black triangle (▼) designation, meaning they are subject to additional monitoring; any suspected side effects should be reported to your national reporting scheme (such as the UK's Yellow Card scheme) and discussed with your healthcare professional.
Who these medicines are not suitable for
These medicines are not appropriate for everyone. Suitability depends on factors including existing health conditions, other medications, and individual circumstances. Your prescriber assesses this before and throughout your treatment — it is not something to self-determine. For a broader overview of how these medicines work and what they are, see our guide to what weight loss injections are. You may also find it useful to read about how weight loss injections are assessed for safety through regulated healthcare pathways.
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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Tracking your safety and wellbeing with GLP Trackr
One of the most practical things you can do while on a prescribed weight loss injection is keep a clear record of how you feel — and that is exactly where GLP Trackr helps most.
The app's side-effect tracker lets you log symptoms as they happen — nausea, fatigue, injection-site reactions, or anything else — and builds a timeline you can review over days and weeks. Spotting patterns in your own data (does nausea peak on day two after a dose? does it ease by day four?) gives you something concrete and useful to bring to your next prescriber appointment, rather than relying on memory.
Alongside that, injection-site logging lets you record where each dose was given and track rotation history, which can help reduce localised skin reactions over time. And dose logging with reminders means you always know when your last injection was and when the next is due — reducing the chance of an accidental missed or delayed dose.
For a fuller picture of managing your injection journey, visit our weight loss injections guide.
GLP Trackr is a tracking and journaling tool — it does not replace the advice of your prescriber or doctor, and any concern about symptoms or your treatment should always be taken to a healthcare professional promptly.
Start logging your symptoms and building a record you can actually use — 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.
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.
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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.
Download glptrackr today.
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Frequently asked questions.
Prescription weight loss injections like Mounjaro and Wegovy are approved medicines considered appropriate for people they are prescribed to, but safety is individual. Your prescriber or doctor assesses whether they are suitable for you based on your health history and monitors you throughout treatment.
The most commonly reported side effects are gastrointestinal — nausea, constipation, diarrhoea, and indigestion. Fatigue, headache, and mild injection-site reactions are also noted. Many people find these ease after the first few weeks. Always discuss persistent or severe symptoms with your healthcare professional.
Contact your prescriber or doctor promptly if you experience severe or persistent abdominal pain, persistent vomiting, signs of an allergic reaction, or any symptom that feels serious. Do not wait to see if it passes — your healthcare professional is best placed to advise you.
No. These are prescription-only medicines because suitability depends on your individual health, existing conditions, and other medications. A qualified prescriber or doctor decides whether they are appropriate for you — it is not a decision to make without clinical input.
GLP Trackr lets you log symptoms as they happen and review patterns over time. This gives you a clear record to discuss with your prescriber at appointments. The app is a tracking tool and does not replace professional medical advice.