Novo Nordisk, Eli Lilly, and the Science Behind Each Medicine
Understanding who makes what helps cut through the confusion that sometimes surrounds these two medicines.
Novo Nordisk and Wegovy (semaglutide)
Novo Nordisk is the Danish pharmaceutical company behind Wegovy. Its active substance is semaglutide, a GLP-1 receptor agonist. It works by mimicking a naturally occurring hormone involved in appetite regulation, contributing to a commonly reported reduction in hunger and increased feelings of fullness. Wegovy is administered as a once-weekly injection via a pre-filled pen, with dose strengths typically ranging from 0.25 mg up to 2.4 mg, adjusted over time by the prescriber.
Eli Lilly and Mounjaro (tirzepatide)
Mounjaro is produced by Eli Lilly, a US-based pharmaceutical company. Its active substance is tirzepatide, which acts on both GLP-1 and GIP receptors — making it a dual agonist. This dual mechanism is the key scientific distinction between the two medicines. Mounjaro is also a once-weekly injectable, with dose strengths commonly ranging from 2.5 mg to 15 mg, again with any adjustments directed by the prescriber.
What they share
Despite coming from different companies with different molecules, both medicines share important characteristics: both are prescription-only, both are typically started at a low dose and titrated gradually under clinical supervision, and both carry a black triangle (▼) designation in some markets, meaning healthcare professionals and patients are encouraged to report side effects through their national reporting scheme (such as the UK's Yellow Card scheme). Neither medicine is suitable for everyone — that determination belongs with a qualified prescriber.
For a structured side-by-side of how the two medicines compare in practical terms, see our Mounjaro vs Wegovy comparison, or explore the dosage differences between Mounjaro and Wegovy for more on titration schedules.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Whichever Medicine You Have Been Prescribed, GLP Trackr Supports Your Journey
The question of which medicine is clinically appropriate is one for your prescriber — but once that decision is made, staying consistent with whichever you have been prescribed is where GLP Trackr comes in.
The most relevant feature here is dose and injection logging. Whether you are on Wegovy or Mounjaro, the app lets you record every injection — the date, the dose strength, and the injection site — so you always have an accurate picture of where you are in your treatment. Given that both medicines involve a gradual titration schedule managed by your prescriber, having a clear log of every dose taken is a useful record to bring to your next clinical appointment.
The app also tracks side effects over time, which can be particularly helpful during the early weeks of either medicine when gastrointestinal symptoms are most commonly reported. Spotting patterns in your own data — and sharing a clear summary with your prescriber — is more useful than trying to recall how you felt three weeks ago from memory.
GLP Trackr supports users on both Mounjaro and Wegovy. You can also explore our broader guide on the Wegovy vs Mounjaro comparison, or if you are curious about how semaglutide compares across different products, our page on Ozempic vs Wegovy covers that ground.
Any question about switching medicines, changing your dose, or which treatment is most appropriate for you should be directed to your prescriber or doctor — they have the full picture of your health history that no app can replicate.
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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.
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.
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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.
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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.
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Frequently asked questions.
No. Mounjaro (tirzepatide) is made by Eli Lilly. Novo Nordisk makes Wegovy (semaglutide). They are different medicines from different manufacturers, with different active substances and mechanisms of action.
Wegovy contains semaglutide, a GLP-1 receptor agonist. Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors — a dual mechanism. Both are prescription-only; which is appropriate for an individual is a clinical decision made by their prescriber.
Neither can be declared universally better. Both are prescription-only medicines and their suitability depends entirely on an individual's health history and clinical circumstances. Your prescriber or doctor is the right person to make that determination, not a comparison article.
Any decision to switch between medicines must be made with your prescriber or doctor. Switching involves clinical considerations specific to your health profile. Never change or stop a prescribed medicine without professional guidance.
Yes. GLP Trackr supports people on both Wegovy and Mounjaro. You can log doses, injection sites, side effects, weight, and food regardless of which medicine you have been prescribed.