Switching from Mounjaro to Wegovy: Summary of Side Effects and Effectiveness Comparison

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Switching from Mounjaro to Wegovy,

what about side effects and effectiveness?

Hello,

I’m Sung Hyun-joo, director of Cheongdam OK Clinic.

▶ Full member of the Korean Academy of Cosmetic Surgery (KACS)
▶ Full member of the Korean Society for the Study of Obesity (KSSO)
▶ Full member of the Korean Academy of Obesity and Aesthetic Body Shape (KAAM)
▶ Full member of the Korean Society of Liposuction (KSSL)
▶ Full member of the Korean Society of Aesthetic Surgery (KSAS)

There are more people than you might think who are considering

switching from Mounjaro to Wegovy, or vice versa.

“Which one is more effective?”,

“Is there one with fewer side effects?”

These questions often come up during consultations.

Although the two medications may seem to be in the same class,

they differ in how they work and in how people respond to them,

Switching from Mounjaro to Wegovy

so rather than making a simple comparison, it is important to

set criteria and choose accordingly.

Today, I’ll organize the key points you should know before switching.

Table of Contents
1. Mounjaro vs. Wegovy: differences in mechanism of action 2. Weight-loss effect: how big is the actual difference? 3. Side-effect comparison: which reactions are more common? 4. Criteria for switching and points to watch out for

1. Mounjaro vs. Wegovy: differences in mechanism of action

Both medications are injectable treatments that reduce appetite

and increase fullness,

but there are differences in how they work.

Switching from Mounjaro to Wegovy

Mounjaro (tirzepatide) has a dual-action structure that works on

both GLP-1 and GIP.

In addition to suppressing appetite, it has the characteristic of

regulating insulin response at the same time.

On the other hand, Wegovy (semaglutide) is a single GLP-1

action medication.

It is structured to focus on maintaining fullness by reducing

food intake and delaying gastric emptying.

2. Weight-loss effect: how big is the actual difference?

Looking at research results, the average amount of weight loss

is often greater with Mounjaro.

Mounjaro

Some studies report cases of a reduction of up to around 15–20%

from the initial body weight.

Wegovy is also a medication with clear effectiveness, and weight

loss of around 10–15% has been reported.

Wegovy

What matters here, however, is not the average numbers but

individual response.

Even with the same medication, the results can vary greatly

depending on diet, basal metabolism, and lifestyle patterns.

So rather than approaching it as a drug that will “definitely make

you lose more weight,” the more important criterion is how your

body responds to it.

3. Side-effect comparison: which reactions are more common?

The most common side effects of both medications are

gastrointestinal symptoms. Nausea, bloating, and discomfort due to

decreased appetite are typical examples.

Because Mounjaro has a broader range of action, some people may

feel stronger stomach discomfort during the initial adjustment

period.

However, after the body adjusts, it often remains stable.

Wegovy tends to produce side effects in a relatively predictable

pattern.

Switching from Mounjaro to Wegovy

Because the dose is increased step by step, the adjustment period

tends to be relatively gradual.

4. Criteria for switching and points to watch out for

There are usually three reasons to consider switching.

First, the effect is less than expected. If there is little change in

weight after using the medication for a certain period, changing

the medication can be considered.

Second, side effects continue. In particular, if gastrointestinal

discomfort affects daily life, adjustment is needed.

Third, the response decreases during the maintenance phase.

The important thing to note is not to switch immediately.

Switching from Mounjaro to Wegovy

Because of the characteristics of the medication, it is necessary

to change it after a certain interval of time.

Also, rather than starting with the same dose, it is often adjusted

again from the initial dose.

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Switching from Mounjaro to Wegovy