How the Side-Effect Profiles of Mounjaro and Wegovy Compare
Mounjaro and Wegovy are both once-weekly injectable medicines used for weight management, and both work by acting on GLP-1 receptors in the brain and gut. Because of this shared mechanism, the side effects people commonly report on either medicine tend to overlap significantly.
The most commonly reported side effects on both medicines
- Nausea — particularly in the first few weeks or after a dose step-up
- Vomiting
- Diarrhoea or constipation
- Indigestion, reflux, and burping
- Fatigue and headache
- Injection-site reactions such as redness or discomfort
Mounjaro also targets GIP receptors in addition to GLP-1, making it a dual-receptor agonist. Whether this difference in mechanism translates into a meaningfully different side-effect experience varies from person to person — clinical comparisons are ongoing, and your prescriber is best placed to discuss what the current evidence means for your individual situation.
It is worth noting that both medicines carry a black triangle (▼) designation in some countries, meaning they are subject to additional monitoring. Any side effects you experience should be reported to your healthcare professional and, where appropriate, to your national reporting scheme (such as the UK's Yellow Card scheme).
For a closer look at how side effects on one of these medicines are commonly experienced, the Wegovy side effects overview covers what people typically report on semaglutide. You may also find it helpful to read about which weight loss injections tend to have the least side effects for a broader comparison, or explore what weight loss injection has the least side effects in more detail.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Side Effects to Find What Works for You
Because side-effect experience is so individual, tracking your own symptoms over time is one of the most practical things you can do — both to understand your own patterns and to have a clear, evidence-based conversation with your prescriber.
GLP Trackr's side-effect tracker lets you log how you feel after each dose, recording symptoms like nausea, fatigue, or digestive discomfort alongside the date, dose strength, and injection site. Over time, this builds a personal picture: you might notice that nausea peaks on day two after your injection, or that it has noticeably reduced since your first few weeks. That kind of pattern is difficult to recall from memory alone, but straightforward when it is logged consistently.
The app also generates a doctor report — a summary of your logged data that you can bring to a prescriber appointment. If you are wondering whether your side effects are typical, worsening, or improving, having a timestamped record makes that conversation much more grounded than trying to describe things retrospectively.
For a comprehensive overview of what to expect on tirzepatide, the Mounjaro side effects hub covers the full range of commonly reported experiences and how to track them.
If you are experiencing side effects that feel severe, persistent, or worrying at any point, contact your healthcare professional promptly. GLP Trackr is a tracking tool — it supports your journey and helps you prepare for those conversations, but it is not a substitute for your prescriber's clinical judgement.
Log your symptoms, spot your patterns, and go into every appointment prepared. Download GLP Trackr on the App Store or Google Play and start your free 7-day trial today.
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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.
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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.
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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.
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Frequently asked questions.
Both medicines share a broadly similar side-effect profile because both act on GLP-1 pathways. There is no definitive answer for everyone; individual experience varies widely. Your prescriber is best placed to discuss which medicine suits your health history and circumstances.
Yes, side effects such as nausea, digestive discomfort, and fatigue are commonly reported on both Mounjaro and Wegovy, particularly in the early weeks or after a dose increase. For many people they ease with time, but always discuss persistent or severe symptoms with your healthcare professional.
Many people find that side effects — especially nausea — are most noticeable early in treatment or after a dose step-up, and ease as the body adjusts. This varies between individuals. If side effects persist or feel severe, speak with your prescriber rather than making changes on your own.
Contact your healthcare professional promptly if side effects are severe, persistent, or worrying — for example, severe abdominal pain, persistent vomiting, or any symptoms that concern you. Do not wait for a scheduled appointment if something feels serious.
GLP Trackr's side-effect tracker lets you log symptoms after each dose, recording what you experienced, when, and at what dose strength. Over time this reveals patterns you can discuss with your prescriber — far more useful than trying to recall details from memory at an appointment.