Mounjaro, Wegovy, and the Companies Behind Them
It is easy to mix up the two medicines, partly because both are prescription-only, once-weekly injectable treatments used in weight management, and both work on GLP-1 pathways. The distinction matters when you are looking for official product information, patient leaflets, or reporting a side effect.
Mounjaro (tirzepatide) — Eli Lilly
Mounjaro is developed and manufactured by Eli Lilly. Its active substance is tirzepatide, which acts on both GLP-1 and GIP receptors — making it a dual receptor agonist. It is supplied as a pre-filled pen and is taken once a week. If you need the official patient information for Mounjaro, the electronic Medicines Compendium (eMC) at medicines.org.uk holds the full Summary of Product Characteristics and patient leaflet.
Wegovy (semaglutide) — Novo Nordisk
Wegovy is made by Novo Nordisk. Its active substance is semaglutide, a GLP-1 receptor agonist, also taken once weekly via a pre-filled pen. If you are looking for information about Wegovy and Novo Nordisk, or more detail on how Novo Nordisk's semaglutide works, those pages cover the specifics. For a broader look at Mounjaro and how it is used, that guide brings together the key facts in one place.
Why the mix-up is common
Both medicines sit in the same therapeutic class, are often discussed together in the media, and are sometimes referred to collectively as "GLP-1 jabs" or "weight-loss injections." Searches for one frequently surface results about the other. Both carry a black triangle (▼) symbol in the UK, meaning they are subject to additional monitoring — and any suspected side effects should be reported to your national reporting scheme (such as the UK's Yellow Card scheme) and to your healthcare professional.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Your Mounjaro Journey with GLP Trackr
Whichever medicine you have been prescribed, staying consistent with your weekly injection schedule is one of the most practical things you can do to support your journey. GLP Trackr's dose logging feature lets you record each injection — date, time, and dose strength — so you always have a clear record of where you are in your treatment.
Beyond dose tracking, the app's side-effect tracker lets you log how you feel after each injection and spot patterns over time. That kind of structured record can be genuinely useful to bring to your next prescriber appointment — far more helpful than trying to recall symptoms from memory.
GLP Trackr also includes gentle dose reminders, so a weekly injection is less likely to slip your mind during a busy week.
Always follow the guidance of your prescriber or doctor regarding your dose and treatment plan — they know your full medical history and are best placed to advise you. GLP Trackr is a tracking tool; it is not a substitute for clinical care.
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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.
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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.
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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.
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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.
No. Mounjaro (tirzepatide) is manufactured by Eli Lilly. Novo Nordisk is the company behind Wegovy (semaglutide). Both are prescription-only, once-weekly injectable medicines used in weight management, but they have different active substances and different manufacturers.
Mounjaro contains tirzepatide, a dual GLP-1 and GIP receptor agonist made by Eli Lilly. Wegovy contains semaglutide, a GLP-1 receptor agonist made by Novo Nordisk. Both are prescription-only once-weekly injections. Which is appropriate for you is a decision for your prescriber or doctor.
The official Summary of Product Characteristics and patient leaflet for Mounjaro are available on the electronic Medicines Compendium (medicines.org.uk). Your pharmacist can also provide the leaflet included with your pen.
GLP Trackr lets you log each injection, including date, time, and dose strength, alongside a side-effect diary. You can review your records over time and share a summary with your prescriber. It is a tracking tool, not a source of medical advice.