Can I Change from Wegovy to Mounjaro?

Wegovy and Mounjaro are both once-weekly injectable prescription medicines used in weight management, but they work in slightly different ways. Wegovy contains semaglutide, a GLP-1 receptor agonist. Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors — making it a dual agonist. Because they affect overlapping but not identical pathways, they are not simply interchangeable at equivalent doses.

Why people consider switching

Reasons someone already prescribed Wegovy might ask about moving to Mounjaro vary widely — some relate to tolerability, others to availability or a change in their clinical circumstances. Whatever the reason, the practicalities of any switch are for your prescriber to guide, including how doses would be managed across the two medicines. There is no standard conversion that a patient can apply independently, and attempting to self-direct a change carries real risks.

What your prescriber will consider

A prescriber looking at this question would typically weigh up your current dose and how well you have tolerated it, any side effects you have experienced, your broader health history, and whether Mounjaro is appropriate and available to you. They may also want to discuss timing — whether a washout period is needed or how the transition should be paced.

If you are researching the differences between the two medicines before that conversation, the Wegovy to Mounjaro overview covers the factual background in more detail, and our Wegovy to Mounjaro dose comparison outlines how the dose ranges of the two medicines sit alongside each other — useful context to read before speaking with your prescriber, though not a substitute for their guidance. You can also find broader information on tirzepatide in our Mounjaro guide.

If you are weighing up the differences between the two medicines more generally, the page on swapping from Wegovy to Mounjaro explores the topic further.

If your prescriber does agree a switch is right for you, keeping a clear record of your journey becomes especially valuable — and that is where GLP Trackr can help.

The most immediately useful feature during any transition is dose logging. You can record every injection — the medicine, dose strength, date, and time — so there is no ambiguity about where you are in your schedule. If you have been on Wegovy for several months, you will already have a log of those doses; switching to Mounjaro simply continues that record in the same place, giving you and your prescriber a clean timeline to refer back to.

Alongside that, the side-effect tracker lets you note how you feel day to day — particularly useful when starting a new medicine or dose, when your body may respond differently than it did before. Spotting patterns over time (when nausea tends to peak, how energy shifts across the week) gives you something concrete to discuss at follow-up appointments rather than relying on memory.

GLP Trackr also generates a doctor report — a summary of your logged data that you can bring to your prescriber. If you are going in to discuss a potential switch, or attending your first review after starting Mounjaro, having a structured record of your previous journey can make that conversation more productive.

Always follow the guidance of your prescriber or doctor throughout any change — they know your full history and are best placed to advise on timing, dose, and what to watch for. GLP Trackr helps you capture the detail; it is not a substitute for clinical oversight.

Ready to keep a cleaner record of your injections and how you feel? GLP Trackr is free to try for 7 days — available on the App Store and Google Play.