What the safety profile of these injections looks like
Both Mounjaro and Wegovy belong to a class of medicines that act on appetite-regulating pathways in the body — GLP-1 receptor agonists, with tirzepatide also acting on GIP receptors. They are prescription-only precisely because their suitability and safety must be assessed by a qualified prescriber for each individual.
Commonly reported side effects
The most frequently reported effects are gastrointestinal: nausea, vomiting, diarrhoea, constipation, indigestion, and reflux. These are most common after a dose is first started or increased, and many people find they ease as the body adjusts. Fatigue, headache, dizziness, and reactions at the injection site are also reported.
According to NHS guidance, these medicines are subject to additional safety monitoring — indicated by the black triangle (▼) on their packaging — which means healthcare professionals and patients are encouraged to report any suspected side effects to their national reporting scheme (such as the UK's Yellow Card scheme, or the equivalent in your country).
Who these medicines are not suitable for
They are not suitable for everyone. People with a personal or family history of certain thyroid conditions, pancreatitis, or other specific health factors may not be candidates. Suitability is always a decision made by your prescriber — not something to determine from general information alone.
If you are pregnant, trying to conceive, or breastfeeding, speak with your prescriber or doctor promptly before continuing. These are special-care situations that require direct clinical guidance.
Injection site safety
These medicines are injected subcutaneously — typically into the abdomen, thigh, or upper arm. Rotating injection sites is generally recommended to reduce the risk of skin reactions or changes at any one spot. For more detail on sites and rotation, see our overview of the new weight loss injection and the broader guidance on whether weight loss injections are safe.
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 injection journey with GLP Trackr
One of the most practical things you can do while on a weekly injection is keep a clear, timestamped record of every dose and every site — and that is exactly where GLP Trackr's injection-site tracking is designed to help.
The app logs each injection: the site you used (abdomen, thigh, or upper arm), the date, and the dose strength. From that history, it suggests your next rotation automatically, so you are never guessing which site is overdue. Over time, you build a reliable picture of your injection routine without having to rely on memory.
The side-effect tracker is equally useful here. If you notice a reaction at a site, or experience nausea or fatigue in the days after a dose, you can log it with a note. Spotting patterns in your own data — does the fatigue hit harder after certain sites, or on certain days of your cycle? — gives you something concrete to bring to your next prescriber appointment rather than a vague recollection.
For a fuller picture of everything covered on this topic, visit our guide to weight loss injections and explore the safety considerations around weight loss injections in more detail.
Important: if you experience any severe, persistent, or worrying symptoms — including severe abdominal pain, significant vomiting, or anything that concerns you — contact your healthcare professional promptly. GLP Trackr helps you record what you are experiencing so you can discuss it clearly with your prescriber; it is not a substitute for their clinical judgement.
Start logging your injection sites and side effects from day one — GLP Trackr is available free on the App Store and Google Play, with a 7-day trial so you can see how it fits your routine.
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.
Mounjaro and Wegovy are prescription-only medicines that have undergone regulatory review. They carry known side effects and are not suitable for everyone. Your prescriber assesses whether they are appropriate for you based on your individual health history.
The most commonly reported side effects are gastrointestinal — nausea, vomiting, diarrhoea, constipation, and indigestion. Fatigue, headache, and injection-site reactions are also reported. These often ease after the initial adjustment period, but any persistent or severe symptoms should be discussed with your healthcare professional.
No — suitability varies by individual. People with certain thyroid conditions, a history of pancreatitis, or other specific health factors may not be suitable candidates. Your prescriber determines whether the medicine is appropriate for you. If you are pregnant or trying to conceive, seek clinical advice promptly.
Contact your healthcare professional promptly if you experience severe or persistent symptoms — such as intense abdominal pain, significant vomiting, or anything that concerns you. Do not wait for your next scheduled appointment if something feels urgent.
GLP Trackr lets you log each injection site and date, suggests your next rotation, and includes a side-effect tracker so you can note symptoms and spot patterns over time. This gives you a clear record to discuss with your prescriber at appointments.