Can You Switch From Wegovy to Mounjaro?

Both Wegovy and Mounjaro are prescription-only, once-weekly injectable medicines used for weight management. Wegovy contains semaglutide, a GLP-1 receptor agonist, while Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors. Because they work on overlapping but not identical pathways, the transition between them is not simply a like-for-like swap.

Why people ask about switching

People explore moving from Wegovy to Mounjaro for a variety of reasons — a plateau in progress, a change in tolerance, availability, or simply wanting to discuss whether a dual-receptor medicine might suit them better. None of these reasons makes a switch automatic; your prescriber will make that call based on your full picture.

How a switch is typically managed

There is no universal protocol for swapping from one medicine to the other, and your prescriber will determine the approach that is right for you. Some people ask whether they can switch straight away; others wonder about a washout period. These are exactly the kinds of questions to raise with your healthcare professional — they will advise based on your current dose, how long you have been on Wegovy, and any side effects you have experienced.

It is also worth knowing that starting Mounjaro after Wegovy does not mean beginning at the highest dose you were on. Tirzepatide has its own titration schedule, and your prescriber will decide at which strength to begin. Any decision about your dose — including where to start after a switch — is theirs to make, not yours alone.

Side effects to be aware of

Both medicines share a similar profile of commonly reported side effects, particularly gastrointestinal ones such as nausea, indigestion, and changes in bowel habits. Some people find that moving from one medicine to the other brings a temporary return of early-stage side effects as the body adjusts to the new active substance. If you experience anything severe, persistent, or worrying during a transition, contact your healthcare professional promptly. You can also find factual information about what to expect in our overview of Mounjaro side effects.

If you are also considering the reverse direction, the experience of switching back to Mounjaro from Wegovy is covered separately. For those coming from a different medicine altogether, the process of switching from Saxenda to Mounjaro raises its own distinct questions.

When you change medicines, keeping a clear record of how you feel becomes even more valuable. GLP Trackr's side-effect tracker lets you log symptoms day by day — nausea, fatigue, digestive changes, energy levels — so you can see patterns emerge over time rather than relying on memory when you next speak to your prescriber.

Alongside that, the dose logging feature means every injection is recorded: the date, the dose strength, and which pen you used. If you are moving from Wegovy to Mounjaro mid-titration, having an accurate log of your previous doses makes those early conversations with your healthcare team clearer and more useful. The app also generates a summary you can bring to a prescriber appointment, so nothing important gets left out.

For more detail on what the transition can look like in practice, see our dedicated page on moving from Wegovy to Mounjaro.

GLP Trackr is a tracking and journaling app — it is not a substitute for your prescriber's advice, and any decision about switching, timing, or dosing must be made with them. If you experience any side effects that feel severe or do not settle, reach out to your healthcare professional rather than waiting for your next scheduled appointment.

Want to track how your body responds during a medication change? GLP Trackr is free to try for 7 days — available on the App Store and Google Play. Log your symptoms, record every dose, and go into your next appointment with a clear picture of your journey so far.