How Wegovy and Mounjaro Differ — and Why That Matters for a Switch
Both Mounjaro and Wegovy are once-weekly injectable medicines used in weight management, but they are not interchangeable in mechanism or dose. Mounjaro (tirzepatide) acts on both GIP and GLP-1 receptors, while Wegovy (semaglutide) acts on GLP-1 receptors only. In practical terms, this means your body has been responding to a dual-receptor medicine, and moving to a single-receptor one may feel noticeably different.
What the change can mean in practice
- A new titration schedule: Wegovy has its own starting dose and escalation pathway. Your prescriber will determine where you begin — it is not simply a continuation from your Mounjaro dose.
- Side effects may shift: Some people report that gastrointestinal effects feel different in pattern or intensity when switching. This is not universal, and experiences vary considerably.
- Food noise and appetite may feel different: Because the receptor profile differs, the subjective sense of fullness or reduced appetite can change. Many people find it takes a few weeks on the new medicine to settle into its effects.
- Progress may look different short-term: Any switch involves a transition period. Weight trends during this time may not reflect what the new medicine will deliver once established.
If you are considering this switch or have already been prescribed Wegovy after Mounjaro, it is worth reading about how Wegovy works and what to expect during the early weeks. For broader context on life after Mounjaro — including what happens when treatment changes — the after-Mounjaro guidance covers many of the questions people commonly face.
According to information on the electronic Medicines Compendium, both tirzepatide and semaglutide are prescription-only medicines, and any change in treatment should be directed by your prescriber.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking a Medicine Switch with GLP Trackr
A transition between two medicines is one of the moments when consistent tracking matters most — and where GLP Trackr's dose logging can be especially useful. When you start Wegovy after Mounjaro, logging each new injection (dose strength, date, and injection site) gives you a clear record of exactly where you are in your new schedule, which is easy to lose track of during any change.
Beyond dose logging, the side-effect tracker lets you note how you feel in the days after each injection — useful data to bring to your next prescriber appointment, particularly if your experience on Wegovy feels different from Mounjaro. The daily check-in (weight, energy, mood, food noise) can help you spot whether the transition period is settling or whether something needs discussing with your doctor.
If you have previously been tracking a break in treatment, the guidance on restarting Wegovy after a gap may also be relevant to your situation. And for a broader view of managing your injectable weight-management journey, the Mounjaro overview remains a useful reference point alongside your new prescription.
Always follow your prescriber or doctor's guidance on how to begin your new medicine — they know your full history and the right starting point for you. If you experience symptoms that are severe, persistent, or worrying after switching, contact your healthcare professional promptly rather than waiting for your next scheduled appointment.
Ready to track your new chapter? GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and start logging your Wegovy journey from day one.
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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.
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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.
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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.
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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.
Switching from Mounjaro (tirzepatide) to Wegovy (semaglutide) is a decision for your prescriber or doctor. Because the medicines differ in mechanism and have separate dose titration schedules, any switch should be planned and directed by your healthcare professional, not made independently.
Your prescriber will determine the appropriate starting dose of Wegovy based on your history and circumstances. Do not assume your Mounjaro dose translates directly — always follow the schedule your prescriber sets out for your new prescription.
Side effects can vary between the two medicines because they work differently. Some people notice a change in gastrointestinal symptoms or appetite effects during the transition. Experiences differ, and if anything feels severe or persistent, speak with your healthcare professional promptly.
GLP Trackr lets you log each new injection, dose strength, and injection site, and track side effects and daily wellbeing through the app's check-in feature. This gives you a clear record of your transition to bring to your prescriber appointments.
This varies between individuals and depends partly on the starting dose and titration schedule your prescriber sets. A transition period of several weeks is common before the new medicine is fully established. Your prescriber or doctor is the best person to advise on what to expect in your case.