If you have been hearing a lot about Wegovy vs Mounjaro lately, you are not alone. These two weight loss injections have taken the UK by storm, and for good reason. They actually work. but here is the problem. Most people do not know which one is right for them. Is Mounjaro really worth the extra cost? Is Wegovy good enough? And what does your own health situation have to do with the choice?

This guide answers all of that in plain, simple English. No medical jargon, no confusing information. Just clear advice to help you make the right decision for your body and your budget. Both Wegovy and Mounjaro are available right now at Earlsdon Pharmacy in Coventry, so by the end of this article, you will know exactly which one suits you best.

Wegovy vs Mounjaro Basic Overview

Wegovy and Mounjaro are both prescription weight loss injections approved for use in the UK by the MHRA. They are both taken once a week using an injection pen at home and they both help you eat less by making you feel fuller for longer.

But they are not the same medication.

Wegovy contains an active ingredient called semaglutide. It works by mimicking one natural hormone in your body called GLP-1, which is released after you eat. This hormone tells your brain that you are full, so you naturally eat less food over time.

Mounjaro contains a different ingredient called tirzepatide. It works by mimicking two hormones at once, GLP-1 and GIP. Because it targets two pathways instead of one, it tends to produce stronger results for most people. Wegovy was approved in the UK in September 2021 and Mounjaro followed in November 2023.

How Do They Work?

When you eat, your gut releases a hormone called GLP-1. This hormone travels to your brain and tells it that you are satisfied. It also slows down how quickly your stomach empties, which keeps you feeling full for longer. The result is that you eat less at your next meal without even trying.

Wegovy copies this process. It mimics GLP-1 so your brain gets that fullness signal even when you have not eaten a large amount of food. Over time, this leads to a significant reduction in how many calories you consume and the weight comes off gradually.

Mounjaro does all of this too, but it also targets a second hormone called GIP. GIP plays a role in how your body stores and uses fat. When Mounjaro activates both receptors together, your appetite drops more sharply, your body becomes better at burning fat for energy, and the overall weight loss effect is stronger. This dual action is the main reason why Mounjaro tends to outperform Wegovy in clinical trials.

If you want a deeper understanding of exactly how Mounjaro works in your body, read our full guide: What Is Mounjaro & How Does It Work For Weight Loss?

How Much Weight Can You Actually Lose?

Both medications produce impressive results, but Mounjaro tends to deliver more.

In clinical trials, people taking Wegovy lost an average of 13 to 15 percent of their body weight over around 68 weeks. People taking Mounjaro lost an average of 20 to 22.5 percent of their body weight over 72 weeks. In a head-to-head trial published in the New England Journal of Medicine in May 2025, Mounjaro users lost 20.2 percent of body weight compared to 13.7 percent for Wegovy users.

Most people start noticing changes around weeks four to eight. The weight loss is slow at first because you start on a low dose. As your dose increases over the months, the results pick up speed. By the six month mark, most people on either medication have lost a noticeable amount of weight.

Your personal results will depend on your starting weight, how closely you follow a healthy diet, how active you are, and how your body responds to the medication.

Dosage Schedule

Both medications start at a low dose and gradually increase over time. This process is called titration and it exists to give your body time to adjust, which helps reduce side effects like nausea and stomach discomfort.

For Wegovy, you start at 0.25mg per week for the first four weeks and gradually move up to a maintenance dose of 2.4mg by around week 17. As of 2026, a higher dose of 7.2mg is now also available for patients who need additional support beyond the standard maintenance dose your prescriber will advise if this is appropriate for you. For Mounjaro, the starting dose is 2.5mg per week and you gradually increase to the maximum dose of 15mg per week from around week 21 onwards.

Both medications are self-administered at home using pre-filled injection pens. Wegovy uses the FlexTouch Pen and Mounjaro uses the KwikPen. Both are simple to use even if you have never given yourself an injection before. Your pharmacist at Earlsdon Pharmacy can walk you through the process the first time. Once you reach your weight loss goal, your doctor will guide you to step back down to a lower maintenance dose rather than stopping suddenly.

Side Effects

Most side effects from both medications are mild, happen early in treatment, and improve as your body adjusts.

The most common side effects for both injections are digestive. These include nausea, diarrhoea, constipation, vomiting, and stomach pain. They tend to be most noticeable when you first start or when your dose increases, and they usually settle down within a week or two. Eating smaller meals, avoiding fatty or spicy foods, and staying well hydrated can all help manage them.

In the 2025 head-to-head trial, around six percent of Mounjaro users and eight percent of Wegovy users stopped before completing the study because of side effects. Neither medication causes low blood sugar on its own, but if you are taking diabetes medications such as insulin, your doctor will need to monitor this carefully.

If you ever experience severe stomach pain, persistent vomiting, or signs of an allergic reaction, stop the medication and contact a healthcare professional straight away. If you want to know more about what to expect specifically with Wegovy, take a look at our detailed guide: Common Side Effects of Wegovy You Should Know

UK Pricing in 2026

Cost is one of the biggest factors when choosing between these two medications.

At Earlsdon Pharmacy in Coventry, Wegovy is available from £99.99 and Mounjaro is available from £179.99. The price difference reflects the fact that Mounjaro is a newer, more advanced dual-action medication. For someone on a tighter budget, Wegovy still delivers strong clinically proven results at a lower cost. For those who want maximum weight loss and can manage the higher price, Mounjaro tends to deliver more per pound spent.

On the NHS, Wegovy has been available through specialist weight management services for longer. Mounjaro received NHS approval for weight management in December 2024 but access is still limited and waiting lists can be long. Most people accessing these medications quickly in Coventry are doing so privately through Earlsdon Pharmacy.

NHS vs Private Access

To qualify for either medication on the NHS, you generally need a BMI of 35 or above and at least one weight-related health condition such as type 2 diabetes, high blood pressure, or high cholesterol. You also need a referral to a specialist weight management service, and waiting times across the UK including Coventry can be very long.

The private route means you can access either medication much faster, often within days of your consultation. You pay for the medication yourself but you skip the waiting list entirely and get direct support from a qualified pharmacist. Earlsdon Pharmacy offers both medications privately with clinical consultations included.

Who Should Choose Wegovy?

Wegovy is the right choice if budget is your primary concern. It offers clinically proven weight loss at a lower monthly cost and is a strong option for people looking to lose a moderate amount of weight. It is also a sensible choice if you are already taking semaglutide for type 2 diabetes under the brand name Ozempic, as your body is already familiar with the active ingredient.

If your main concern is heart health, Wegovy currently has the stronger track record. A major study of over 17,000 people found that semaglutide reduced the risk of heart attack, stroke, and cardiovascular death by 20 percent. Mounjaro is expected to show similar benefits but the research is still ongoing.

Who Should Choose Mounjaro?

Mounjaro is the better option if your primary goal is maximum weight loss. If you have a significant amount of weight to lose, have tried other methods without success, or have not seen the results you hoped for on Wegovy, Mounjaro is likely to deliver stronger outcomes. Its dual-action mechanism simply produces more weight loss on average.

Mounjaro is also a particularly good fit for people who have type 2 diabetes alongside obesity. The medication was originally developed as a diabetes treatment so it helps manage blood sugar levels at the same time as supporting weight loss. If you have the budget and want the most powerful option currently available in the UK, Mounjaro is the clear choice based on current clinical evidence.

What Happens If You Stop?

Both Wegovy and Mounjaro work as long as you are taking them. When you stop, the hormonal signals reducing your appetite gradually fade and for most people hunger levels return to where they were before. Without continued lifestyle changes in place, a significant amount of the weight can come back over time.

This means these medications work best as part of a longer-term plan that includes real changes to your diet and activity levels. The medication gives you the window to build those habits. When stopping, your doctor will guide you to step down gradually through lower doses rather than stopping cold, which helps your body adjust more smoothly.

Can You Switch Between the Two?

Yes, switching from Wegovy to Mounjaro or vice versa is possible and happens quite often. The most common reasons are cost, side effects, and availability. Some people start on Mounjaro and find the cost difficult to sustain, so switching to Wegovy makes sense. Others start on Wegovy and want stronger results, so they move up to Mounjaro.

The most important rule is never to switch without medical guidance. Your new starting dose needs to be assessed properly and your prescriber needs to monitor how your body responds. Switching safely is straightforward when done through a pharmacy that supports you properly.

Eligibility Are You Suitable?

Both medications require you to be between 18 and 85 years old with a BMI of 30 or above, or a BMI of 27 or above if you have at least one weight-related health condition such as type 2 diabetes, high blood pressure, or high cholesterol.

These medications are not suitable if you have a personal or family history of thyroid cancer, pancreatitis, or severe kidney disease. Pregnancy and breastfeeding also rule out both medications. The best way to check your eligibility is to book a consultation at Earlsdon Pharmacy where the team will review your full health history and recommend the right option for you.

Conclusion

Wegovy and Mounjaro are both genuinely effective weight loss injections that work, are approved, and are helping thousands of people across the UK.

The key difference comes down to results and cost. Wegovy is a trusted, well-established option at a more accessible price. Mounjaro is the more powerful of the two with stronger average weight loss results but costs more per month.

If budget is your main concern, Wegovy is an excellent choice. If you want the strongest results available and can manage the higher cost, Mounjaro is the better option for most people.

Book a free consultation at Earlsdon Pharmacy in Coventry today and get a personalised recommendation based on your own health, weight, and goals. Both Wegovy and Mounjaro are in stock and available now.