What changes when you swap from Mounjaro to Wegovy
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, while Wegovy (semaglutide) acts on GLP-1 receptors only. Both are once-weekly injectable medicines, but because their mechanisms differ, transitioning from one to the other is not simply a like-for-like swap — your prescriber will determine the appropriate starting dose and schedule for you on the new medicine.
What many people notice during the transition
It is common for people who have switched to report a period of re-adjustment. Some find that side effects they had previously settled into — such as nausea, changes in appetite, or digestive changes — may feel more noticeable again as the body adapts to a different active substance. Others report the transition feeling relatively smooth. Everyone's response is individual, and your prescriber is the right person to guide you through it.
A few things worth being aware of:
- Dose is not directly interchangeable. The dose strengths for tirzepatide and semaglutide are different, and your prescriber will advise on where to start with Wegovy.
- The titration schedule may restart. Many people begin Wegovy at a lower introductory dose, even if they had reached a higher dose on Mounjaro — this is normal and prescribed-led.
- Appetite and food noise may feel different. Because the mechanisms differ, some people notice a change in how hunger or food cravings feel during the early weeks on Wegovy.
For more detail on what this switch can involve in practice, see our pages on moving from Mounjaro to Wegovy and what the swap from Mounjaro to Wegovy looks like. You may also find it useful to read about making the change from Mounjaro to Wegovy for further context.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking your transition with GLP Trackr
One of the most useful things you can do when transitioning between medicines is keep a consistent record of how you feel — and that is exactly where GLP Trackr helps. When your body is adjusting to a new active substance, patterns in your symptoms, appetite, energy and weight can be easy to miss without a reliable log to look back on.
The side-effect tracker lets you note how you feel day to day — nausea, fatigue, digestive changes, or anything else — so you can spot whether things are improving over time and bring a clear picture to your next prescriber appointment. The dose logging feature means your new Wegovy schedule is recorded accurately from day one, with reminders so you never lose track of where you are in your weekly routine. And the daily check-in captures mood, energy, food noise and sleep in about 30 seconds — giving you a genuine before-and-after view of how the transition unfolds.
Your prescriber or doctor is the right person to advise on any concerns during the switch. If side effects feel severe, persistent, or worrying at any point, contact your healthcare professional promptly rather than waiting for your next scheduled appointment. GLP Trackr is a companion to that relationship, not a substitute for it.
For a broader look at everything involved in the Mounjaro journey, visit our Mounjaro overview.
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Frequently asked questions.
No — changing between prescription medicines should always be guided by your prescriber or doctor. They will advise on the right dose to start with and how to manage the transition safely, as the two medicines have different active substances and dose schedules.
Many prescribers do recommend starting Wegovy at an introductory dose even if you had reached a higher dose on Mounjaro, because the medicines work differently. Your prescriber will determine the appropriate starting point based on your individual circumstances.
It is commonly reported that some people experience a re-adjustment period — including nausea or digestive changes — when starting a new GLP-1 medicine. This often settles as the body adapts, but if symptoms are severe or persistent, contact your healthcare professional promptly.
Mounjaro contains tirzepatide, a dual GIP and GLP-1 receptor agonist. Wegovy contains semaglutide, which acts on GLP-1 receptors only. Both are once-weekly injectable prescription medicines, but their mechanisms, dose strengths, and titration schedules differ.
GLP Trackr lets you log your new dose schedule, track side effects day by day, and record mood, energy and food noise during the adjustment period. This gives you a clear record to share with your prescriber and helps you spot patterns as your body adapts.