What the Evidence Says About Safety
Mounjaro works as a dual GIP and GLP-1 receptor agonist, acting on appetite-regulating pathways in the brain and slowing gastric emptying. It is authorised as a prescription medicine for weight management in adults, and its safety profile has been evaluated in large clinical programmes prior to that authorisation.
Commonly reported side effects
The most frequently reported side effects are gastrointestinal — nausea, vomiting, diarrhoea, constipation, and indigestion are among those most commonly experienced, particularly in the earlier weeks of treatment or after a dose adjustment. Fatigue, dizziness, headache, and injection-site reactions are also reported. For many people, these effects are most noticeable when starting or when the dose changes, and they often ease over time.
When to seek help promptly
Certain symptoms warrant prompt contact with a healthcare professional. These include severe or persistent abdominal pain (which could indicate pancreatitis or a gallbladder issue), signs of a serious allergic reaction, significant changes in mood or mental health, and symptoms of low blood sugar if you are also taking medicines for diabetes. This is not an exhaustive list — if something feels wrong, always check with your prescriber or doctor rather than waiting.
What about Wegovy?
Questions about the safety profile of weight loss injections often come up alongside Wegovy (semaglutide), which is a GLP-1 receptor agonist also prescribed for weight management. Both medicines are prescription-only, both have been through formal regulatory review, and both carry similar categories of commonly reported side effects — particularly gastrointestinal ones. The right medicine for any individual is a decision made by their prescriber based on their full medical history.
Mounjaro carries an additional monitoring designation (the black triangle ▼ in the UK), which means healthcare professionals and patients are encouraged to report any suspected side effects to their national reporting scheme — for example, the UK's Yellow Card scheme, or whichever equivalent scheme operates in your country.
For a broader look at what Mounjaro can mean for your weight journey, see our guide to using Mounjaro for weight loss, or explore our weight loss tracking hub for the full picture on tracking your progress safely and consistently.
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.
AI Meal Tracking. Built for GLP 1 Appetites.
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Tracking Your Safety and Progress with GLP Trackr
One of the most practical things you can do while taking a medicine like Mounjaro is keep a clear record of how you feel — not to self-diagnose, but so that patterns become visible and your conversations with your prescriber are grounded in real data rather than memory.
GLP Trackr's side-effect tracking feature lets you log symptoms — nausea, fatigue, dizziness, digestive changes — each day. Over time, the app surfaces patterns: is nausea consistently worse on the day after your injection? Does it ease by day three? That kind of insight is genuinely useful to bring to an appointment. The app also includes a doctor report feature, which pulls your logged data together into a clear summary you can share directly with your healthcare professional.
Alongside symptom logging, GLP Trackr tracks your weight, mood, energy, sleep, and food intake — giving you a rounded view of how your body is responding, not just a single number on the scale. Progress on a GLP-1 medicine is rarely perfectly linear, and having a full picture helps you and your prescriber assess what is working and what might need revisiting. You might also find it useful to explore other approaches that some people use alongside their prescribed treatment to support their journey.
Important: GLP Trackr is a tracking and journaling tool — it is not a substitute for clinical advice. If any symptom feels severe, persistent, or worrying, contact your healthcare professional promptly. Any questions about whether Mounjaro is suitable for you, or about your dose, belong with your prescriber — they know your full history.
Ready to keep a clear record of your journey? GLP Trackr is available free on the App Store and Google Play, with a 7-day trial so you can explore every feature — start tracking today.
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.
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Frequently asked questions.
Mounjaro is a prescription-only medicine authorised for weight management after regulatory review. Its suitability and safety for any individual depends on their medical history and is assessed by their prescriber. It does carry potential side effects, particularly gastrointestinal ones, which your healthcare professional can help you manage.
The most commonly reported side effects are gastrointestinal — including nausea, vomiting, diarrhoea, constipation, and indigestion. Fatigue, headache, dizziness, and injection-site reactions are also reported. Many people find these are most noticeable early in treatment or after a dose change, and they often ease over time.
Both Mounjaro and Wegovy are prescription-only medicines that have been through formal regulatory review. Both commonly cause gastrointestinal side effects. Which is more appropriate for a given individual is a clinical decision made by a prescriber, not something that can be determined by general comparison.
Contact your prescriber or doctor promptly if you experience severe or persistent abdominal pain, significant mood changes, signs of an allergic reaction, or any symptom that feels serious or unusual. Do not wait to see if it passes — your healthcare professional is best placed to advise you.
Yes — GLP Trackr lets you log symptoms daily, spot patterns over time, and generate a report to share with your prescriber. It is a tracking tool, not a medical service, but having a clear record of how you feel can make clinical conversations more productive and informed.