Wegovy vs Mounjaro: Which Weight Loss Treatment Is Better?

June 24, 2026

Losing weight can be challenging, especially when diet and exercise alone are not producing the results you need. Prescription weight loss medications such as Wegovy and Mounjaro have become popular options for people looking for additional support.

Both treatments can help with weight loss, but they work in slightly different ways and may suit different individuals depending on their health goals and medical history.

In this guide, we’ll compare Wegovy and Mounjaro, explain how they work, discuss effectiveness, side effects, and help you understand which option may be right for you.

What Is Wegovy?

Wegovy is a prescription weight loss medication containing semaglutide. It belongs to a class of medicines known as GLP-1 receptor agonists.

Semaglutide works by mimicking a natural hormone in the body called glucagon-like peptide-1 (GLP-1). This hormone helps regulate appetite and blood sugar levels.

Wegovy works by:

• Increasing insulin secretion when needed
• Reducing glucagon release
• Slowing stomach emptying
• Helping you feel fuller for longer
• Reducing hunger and food cravings

Wegovy is administered as a once-weekly injection and is licensed in the UK for adults and adolescents aged 12 years and older who meet eligibility requirements. While Wegovy is only available as an injection, semaglutide is also available as a tablet for certain medical conditions under different brand names.

Semaglutide: injection and tablet forms

It’s worth noting that semaglutide, the active ingredient in Wegovy, is available in different formulations. Wegovy is specifically designed for weight management and is administered as a weekly injection. However, semaglutide is also available as an oral tablet under other brand names for specific medical conditions. Your healthcare professional can advise which formulation, if any, is appropriate for your needs.

What Is Mounjaro?

Mounjaro contains tirzepatide and is one of the newest prescription weight loss treatments available in the UK.

Unlike Wegovy, Mounjaro activates two hormone receptors:

• GIP (glucose-dependent insulinotropic polypeptide)
• GLP-1 (glucagon-like peptide-1)

This dual-action approach helps improve the body’s response to insulin while also reducing appetite and slowing digestion.

Mounjaro works by:

• Increasing insulin sensitivity
• Stimulating insulin secretion
• Suppressing glucagon release
• Slowing gastric emptying
• Reducing appetite and calorie intake

Like Wegovy, Mounjaro is administered as a once-weekly injection.

How These Treatments Work

Both medications target the body’s natural appetite-regulating systems.

When food enters the digestive system, hormones are released that signal fullness to the brain. Wegovy and Mounjaro enhance these signals, helping people feel satisfied with smaller portions and reducing the urge to snack between meals.

The key difference is that Wegovy works only through the GLP-1 pathway, while Mounjaro works through both the GLP-1 and GIP pathways.

This additional GIP activity may contribute to greater weight loss for some patients.

Key Differences Between Wegovy and Mounjaro

Feature	Wegovy	Mounjaro
Active ingredient	Semaglutide	Tirzepatide
Drug class	GLP-1 receptor agonist	Dual GIP and GLP-1 receptor agonist
Administration	Weekly injection (semaglutide is also available as tablets under other brands)	Weekly injection
Weight loss mechanism	GLP-1 only	GIP + GLP-1
UK age licence	12 years and above (eligible patients)	Adults only
Availability	Widely used across the UK	Newer treatment option
Cost	Generally lower cost	Typically higher cost
Potential effectiveness	Highly effective	May provide greater weight loss for some patients

 

Effectiveness for Weight Loss

Both Wegovy and Mounjaro have shown impressive results in clinical studies when combined with a healthy diet and increased physical activity.

Wegovy Results

Clinical trials have shown that many patients using Wegovy can lose approximately 15% of their body weight over time when following a comprehensive weight management programme.

Learn more about Wegovy (semaglutide) and whether it may be suitable for your weight loss goals.

Mounjaro Results

Research suggests Mounjaro may produce even greater weight loss in some patients, with studies showing average weight reductions exceeding 20% in certain groups.

The additional GIP receptor activity is believed to contribute to these enhanced outcomes.

However, individual results vary, and the most effective treatment depends on factors such as:

• Current weight and BMI
• Existing health conditions
• Medical history
• Medication tolerance
• Lifestyle factors

Side Effects and Safety

Both medications share similar side effects because they affect digestion and appetite regulation.

Common side effects include:

• Nausea
• Vomiting
• Diarrhoea
• Constipation
• Stomach discomfort
• Reduced appetite

These symptoms are usually mild to moderate and often improve as the body adjusts to treatment.

To minimise side effects, doses are gradually increased over several weeks.

Before starting either medication, a healthcare professional will assess whether treatment is suitable based on your medical history and current health status.

Explore our full range of weight loss treatments to learn more about the options available.

Which Treatment Is Right for You?

There is no single “best” option for everyone.

Wegovy may be suitable if:

• You want a well-established treatment widely used in the UK
• You are looking for a lower-cost option
• You are aged 12 years or older and meet eligibility criteria
• You prefer a treatment with extensive real-world usage data

Mounjaro may be suitable if:

• You are seeking the highest potential weight loss results
• You have been advised that dual-action therapy may be beneficial
• You are comfortable with a newer treatment option
• Your healthcare professional believes tirzepatide is appropriate for your needs

A medical assessment is the best way to determine which treatment aligns with your goals and health profile.

When to Speak to a Healthcare Professional

Weight loss medications should always be used under professional guidance.

If you’re considering Wegovy or Mounjaro, speaking with a qualified healthcare professional can help you understand:

• Which treatment is most suitable
• Expected weight loss outcomes
• Potential side effects
• Lifestyle changes that support long-term success
• Ongoing monitoring requirements

At Rapid Meds, our team can assess your eligibility and help you choose the most appropriate weight management solution.

Book a free consultation with one of our GPs to discuss your options and receive personalised guidance before starting treatment.

Explore Our Weight Loss Treatments

Learn more about our available treatments:

• Weight Loss Treatments: https://rapidmeds.co.uk/product-category/healthy-living/weight-loss/
• Mounjaro: https://rapidmeds.co.uk/product/mounjaro/
• Wegovy (Semaglutide): https://rapidmeds.co.uk/product/wegovy-semaglutide/

Frequently Asked Questions

Which is better for weight loss, Wegovy or Mounjaro?

Both Wegovy and Mounjaro can be effective for weight loss when combined with a healthy diet and physical activity. Clinical studies suggest Mounjaro may lead to greater average weight loss for some patients, but the best option depends on your medical history, goals and individual response to treatment.

What is the difference between Wegovy and Mounjaro?

Wegovy contains semaglutide and works by targeting GLP-1 receptors. Mounjaro contains tirzepatide and targets both GLP-1 and GIP receptors. This dual-action approach may contribute to greater weight loss in some patients.

How much weight can you lose with Wegovy?

Clinical trials have shown that many patients using Wegovy can lose around 15% of their body weight when treatment is combined with lifestyle changes and a structured weight management programme.

How much weight can you lose with Mounjaro?

Studies have shown that some patients taking Mounjaro can lose more than 20% of their body weight. Individual results vary depending on factors such as starting weight, adherence to treatment and lifestyle habits.

Is semaglutide available as a tablet?

Yes. Semaglutide is available in both injection and tablet formulations. Wegovy, which is licensed for weight management, is a once-weekly injection. Oral semaglutide tablets are available under different brand names for specific medical conditions.

Is Wegovy only available as an injection?

Yes. Wegovy is currently available as a once-weekly injection. Although the active ingredient semaglutide is also available in tablet form under other brand names, Wegovy itself is not available as a tablet.

Which treatment has fewer side effects?

Wegovy and Mounjaro have similar side effects because they both affect appetite and digestion. Common side effects include nausea, vomiting, diarrhoea, constipation and stomach discomfort. Most side effects improve as the body adjusts to treatment.

Can I switch from Wegovy to Mounjaro?

Some patients may be able to switch between treatments if advised by a healthcare professional. Any change in medication should be discussed with a qualified prescriber to ensure it is safe and appropriate.

Who can take Wegovy?

Wegovy is licensed in the UK for eligible adults and adolescents aged 12 years and older who meet the prescribing criteria for weight management.

Who can take Mounjaro?

Mounjaro is licensed for adults who meet the eligibility criteria for treatment. A healthcare professional will assess whether it is suitable based on your medical history and weight loss goals.

Do I need a prescription for Wegovy or Mounjaro?

Yes. Both Wegovy and Mounjaro are prescription-only medicines and require an assessment by a healthcare professional before treatment can be provided.

Where can I get weight loss treatment online in the UK?

You can explore available weight loss treatments and complete an online assessment through Rapidmeds to determine whether treatments such as Wegovy (semaglutide) or Mounjaro may be suitable for you.