Your guide to
switching to Wegovy
from Mounjaro

Q: What kind of proof do you need for my current medication dose?

If you’re switching from Mounjaro to Wegovy and want to continue at an equivalent dose, we’ll need proof of your current Mounjaro treatment from the past 60 days . Acceptable proof includes: A clear photo of the medication box showing the dose A copy of your prescription A pharmacy label or letter This allows our prescribers to safely recommend the most appropriate starting dose for Wegovy.

Q: Can I switch from Mounjaro to Wegovy directly?

Can I switch from Mounjaro to Wegovy directly? Yes — you can safely switch from Mounjaro to Wegovy after a short 1-week wash-out period . In many cases, you may be eligible to begin Wegovy at a higher dose, depending on the strength of Mounjaro you were previously using. Your prescriber will guide you to the most appropriate starting dose.

Q: Will I experience the same side effects with Wegovy?

Will I experience the same side effects with Wegovy? Because Wegovy and Mounjaro work in similar ways , the side effects are often similar too — especially if you’ve tolerated Mounjaro well. Typical side effects may include: Nausea Fatigue Diarrhoea or constipation Headache or stomach discomfort Our clinicians will recommend the most appropriate starting dose to support a smooth transition and help keep side effects to a minimum.

Q: Tips for a smooth switch

Tips for a smooth switch Stay consistent with your weekly injections — avoid missing doses where possible. Track any side effects and let your clinical team know about them. Be patient — slow, steady weight loss is what clinicians usually recommend. Remember, weight loss is a marathon, not a sprint. Support your medication with healthy routines around food, movement, and sleep.

Q: Is Wegovy as effective as Mounjaro?

Clinical trial data suggests that Mounjaro may lead to slightly greater weight loss (~20%) compared to Wegovy (~17%) — a difference of around 3%. However, both are highly effective treatments and powerful tools to support your weight loss journey. The best choice depends on factors such as how well you tolerate the medication and practical considerations like cost and availability . For many people, Wegovy can be just as effective in real life as Mounjaro.

Q: What should I do if I’m worried?

What should I do if I’m worried? If you’re feeling worried about switching treatments, side effects, or your progress, you’re not alone. The best step is to reach out to our clinical team — they can review your treatment, answer your questions, and make sure your plan is right for you. Remember, both Mounjaro and Wegovy are safe and effective when taken as prescribed, and our prescribers will guide you through the transition. Staying informed and supported is the best way to feel confident about your journey.

Q: Is every pharmacy increasing their prices?

Yes. The recent price rise comes directly from the manufacturer , which means the cost price has gone up for all UK suppliers. As a result, every pharmacy is affected and prices are increasing across the board. We’re all in the same boat — no pharmacy is able to avoid these changes — but we’ll always make sure our pricing stays fair, transparent, and competitive.

Written by Khushbir Purewall, our head of prescribing and checked by Dr Francis O'Neill

Last reviewed 1st Sept 2025

Should you switch from Mounjaro to Wegovy?
There is a sweet spot.
Read the evidence from our in house clinical research expert so you can make an informed decision.
Click Here

Mounjaro vs Wegovy

While Mounjaro has shown the highest average weight loss in clinical trials, that doesn’t mean Wegovy is a “bad” option. Clinical data is one thing, but in real life results can vary — some people respond better to Wegovy, while others do better on Mounjaro.

If you’re switching from Mounjaro to Wegovy, you might notice a slight change, including the return of some “food noise,” because the dose is reduced a little when moving across. This is the safest and most effective way to switch.

The important thing to remember is that the weight loss you can achieve with Wegovy is still highly significant. As you can see in our calculator below, you may reach your goals a little later — but you will still get there. Stay positive and prepared.

How much weight could you lose?

Based on published trial averages: Wegovy ~17% at ~72 weeks; Mounjaro ~23%. Results vary.

Drag the slider to your start weight

80 kg

In 72 weeks, you could weigh:

Mounjaro

61.6 kg

↓18.4 kg

Wegovy

66.4 kg

↓13.6 kg

Notes

Percent reductions are fixed here (Wegovy 17%, Mounjaro 23%) to match trial averages for this demo.
This is an educational estimator, not medical advice.

Read our expert guide on the evidence that is available. Click Here

What dose should I be changing to?

When switching from Mounjaro to Wegovy, the dose may look smaller on paper, but that’s only because the two medicines work in different ways. What matters is the equivalent effect—the table below shows how your Mounjaro dose translates to the right Wegovy dose.

All you need to do is look up the strength of the Mounjaro injection you’ve been using, enter it below, and select the option shown. This will tell you which Wegovy strength is appropriate for you.

When completing the form, please upload evidence of your last pen (photo showing the pen strength and the date used) so our prescribers can safely verify the dose for you.

If you had side effects on Mounjaro, choose the lower end of the range where there’s a choice; otherwise, the switch should be smooth. You may notice some differences at first, but as you move through the Wegovy doses, the overall effect should feel very similar.

Select your Mounjaro dose to see the equivalent Wegovy dose

Tap a dose below. We’ll show the recommended Wegovy dose based on DoToR's clinical protocol.

Recommended Wegovy dose

—

Based on selected Mounjaro dose —

How do I switch to Wegovy?

To change over from Mounjaro to Wegovy, first use our dose calculator to see the recommended equivalent strength. Once you know your suggested dose, select the option when selecting your Wegovy dose, on the Wegovy order page and then begin your Wegovy application.

As part of the process, you’ll be asked to upload evidence of your last Mounjaro order. Please include a clear picture showing the strength of the medicine and the date/time of use so our prescribers can safely confirm your dose.

If you have any questions or run into problems, simply post them in the comments and our team will be happy to help.

Start your Wegovy journey now. Click Here

Switching questions and answers

What kind of proof do you need for my current medication dose?

If you’re switching from Mounjaro to Wegovy and want to continue at an equivalent dose, we’ll need proof of your current Mounjaro treatment from the past 60 days.

Acceptable proof includes:

A clear photo of the medication box showing the dose
A copy of your prescription
A pharmacy label or letter

This allows our prescribers to safely recommend the most appropriate starting dose for Wegovy.

Can I switch from Mounjaro to Wegovy directly?

Will I experience the same side effects with Wegovy?

Will I experience the same side effects with Wegovy?
Because Wegovy and Mounjaro work in similar ways, the side effects are often similar too — especially if you’ve tolerated Mounjaro well.

Typical side effects may include:

Nausea
Fatigue
Diarrhoea or constipation
Headache or stomach discomfort

Our clinicians will recommend the most appropriate starting dose to support a smooth transition and help keep side effects to a minimum.

Tips for a smooth switch

Tips for a smooth switch

Stay consistent with your weekly injections — avoid missing doses where possible.
Track any side effects and let your clinical team know about them.
Be patient — slow, steady weight loss is what clinicians usually recommend. Remember, weight loss is a marathon, not a sprint.
Support your medication with healthy routines around food, movement, and sleep.

Is Wegovy as effective as Mounjaro?

Clinical trial data suggests that Mounjaro may lead to slightly greater weight loss (~20%) compared to Wegovy (~17%) — a difference of around 3%. However, both are highly effective treatments and powerful tools to support your weight loss journey.

The best choice depends on factors such as how well you tolerate the medication and practical considerations like cost and availability. For many people, Wegovy can be just as effective in real life as Mounjaro.

What should I do if I’m worried?

What should I do if I’m worried?
If you’re feeling worried about switching treatments, side effects, or your progress, you’re not alone. The best step is to reach out to our clinical team — they can review your treatment, answer your questions, and make sure your plan is right for you.

Remember, both Mounjaro and Wegovy are safe and effective when taken as prescribed, and our prescribers will guide you through the transition. Staying informed and supported is the best way to feel confident about your journey.

Is every pharmacy increasing their prices?

What about staying on Mounjaro?

Mounjaro and other GLP-1 medications

Clinical data shows that Mounjaro is currently the most effective of all the GLP-1 medications. For many people, the positive experience of weight loss will be more than enough to justify staying on Mounjaro.

What’s important to remember is that all GLP-1 medications are effective. Some may be slightly less effective than others, but the right choice depends on the dose you require and the cost of treatment needed to achieve steady, sustainable weight loss.

There is no bad product — just degrees of good.

Mounjaro provides the highest weight loss over a given time.

We have worked hard to ensure our prices, for those who wish to stay on Mounjaro, As low as possible .

Click below to goto our Mounjaro page and remember youll get £40 off your orders by using First40

Stay on Mounjaro