Wegovy vs Mounjaro

Before exploring the differences between Mounjaro and Wegovy, it helps to understand the ways in which they are similar.

Both Mounjaro and Wegovy are medicines known as GLP-1 receptor agonists, or GLP-1s for short. These medicines work on your hormones to regulate appetite and support weight loss. In simple terms, both treatments make you:

When it comes to actually injecting the medicine, the experience is practically the same. Both weight loss treatments are taken once a week using a pre-filled injection pen, and both are started at a low dose that increases gradually over time. This is done so that you can adjust to the medicine slowly, reducing the risk of side effects.

Are prescribing guidelines the same?

The prescribing guidelines for both treatments are mostly the same, so this shouldn’t factor into your decision on which one to use. To be prescribed treatment, you must be over 18 with either:

However, Wegovy is the only one of the two approved to reduce the risk of heart complications in overweight or obese adults. If you have experienced a heart attack, stroke, or another serious heart problem, Wegovy may be the better choice.

Mounjaro and Wegovy share mostly the same precautions. However, I always look at each person’s individual health profile before recommending one or the other. It may be that you tolerate one treatment better, regardless of their similarities.

The main differences between the two treatments arise from the active ingredients and how they work in the body.

While both treatments work in roughly the same way, Mounjaro is usually more effective for most people. This is because it works on two pathways, allowing it to have a stronger overall effect on appetite and metabolism.

With that being said, this is not the case for everyone. Some people prefer Mounjaro, while some respond better to Wegovy. At the end of the day, it all comes down to personal preference.

Some other comparisons

When people ask me about the difference between Wegovy and Mounjaro, this is usually the question they really want answered.

To give you a clear picture, here’s what the clinical studies show on average:

At first glance, this suggests Mounjaro may be more effective.

However, it’s important to remember these figures are averages across large groups of people. They are not what every individual will experience.

In reality, each person responds to each treatment in their own way, and lifestyle, consistency, and starting point all make a significant difference.

So while Mounjaro may have a slight edge in studies, the difference is not as dramatic as it can sometimes appear online. The better question is not “which is strongest”, but “which is likely to work best for you”.

Both treatments follow a gradual, step-by-step dosing approach.

You start on the lowest available dose and increase it roughly every four weeks. This gives your body time to adjust and reduces the risk of side effects.

Wegovy starts at 0.25 mg once weekly and typically increases up to 2.4 mg as a standard maintenance dose. In some cases, higher doses such as 7.2 mg may be used if the response at standard doses is not sufficient.

Mounjaro starts at 2.5 mg once weekly and increases through more dose steps, up to 15 mg. Because there are more intermediate doses, it can sometimes be adjusted more gradually depending on how you respond.

In practice, the goal with both treatments is the same. We look for the lowest dose that gives you a good effect while still being well tolerated.

It is also worth knowing that dosing is not always rigid. Some people stay on a dose for longer than four weeks if it is working well, while others may need to adjust up or down depending on how they feel.

Because these medications work in similar ways, the side effects are also broadly similar.

The most common ones affect digestion. This can include nausea, stomach discomfort, diarrhoea, or constipation.

These symptoms are usually most noticeable when starting treatment or increasing your dose. In many cases, they improve as your body adjusts.

How common are the side effects?

To give you a clearer idea of what to expect, I’ve summarised the most commonly reported side effects for both treatments in the table below. This shows how frequently they tend to occur, based on clinical data.

Some people find they tolerate one treatment better than the other. This is quite individual and not something we can always predict in advance.

There are also practical ways to reduce the likelihood and severity of side effects. This includes how you structure your meals, the types of foods you choose, and how gradually your dose is increased.

If you are concerned about this, I would recommend reading our guides on managing side effects. It covers simple strategies that can make a noticeable difference, including what to eat to reduce nausea and how to manage constipation.

In a consultation, I don’t usually see it as choosing a “better” medication. It’s more about which one fits the person in front of me.

A simple way to think about it is this:

Wegovy might be a better fit if…

Mounjaro might be a better fit if…

In practice, both can work very well. The goal is to match the treatment to the individual, rather than trying to force a one-size-fits-all approach.

You can easily switch between Mounjaro and Wegovy, and there are many reasons to do so. Thankfully, we make the process easy at euroClinix. All you have to do if you want to switch is let us know, and we’ll get you started on the equivalent dose of the other treatment without interruptions to your dosing schedule.

To better understand how Mounjaro and Wegovy compare, here is a simple sketch showing equivalent doses.

If I summarise this simply:

Wegovy and Mounjaro are more alike than they are different.

Both can be highly effective when used properly.

Both rely on consistency and lifestyle support.

The real differences come down to:

That is why this decision is best made with proper guidance.