Mounjaro vs Wegovy: Weight Loss Injections in London | Regents Park Aesthetics
In recent years, medical weight loss treatments have become one of the most talked-about solutions for patients struggling to lose weight through diet and exercise alone. Two of the most popular medications now available in the UK are Mounjaro and Wegovy. Both have been shown to deliver significant results for patients seeking safe and effective weight loss, but there are important differences between them.
At our London clinic, we prescribe both weight loss injections – and in this article, we’ll explore what sets Mounjaro and Wegovy apart, the benefits they offer, recent updates on pricing, and how to get the best results while on treatment.
What is Mounjaro?
Mounjaro (tirzepatide) is a newer type of injectable medication designed to support weight management. It works by mimicking two hormones — GLP-1 and GIP — which regulate appetite, slow digestion, and improve insulin sensitivity.
Many patients report:
A significant reduction in appetite and cravings.
Sustained weight loss when combined with a healthy lifestyle.
Additional benefits such as better blood sugar control, improved energy levels, and in some cases, reduced blood pressure and cholesterol.
What is Wegovy?
Wegovy (semaglutide) is another highly effective weight loss injection that works by mimicking the GLP-1 hormone. While it does not target GIP like Mounjaro, it has been widely studied and has helped thousands of patients across the UK lose weight safely.
Patients taking Wegovy often experience:
A steady reduction in weight over time.
Better portion control and reduced snacking.
Secondary health improvements such as lower risk of type 2 diabetes, improved sleep, and reduced joint pain due to weight loss.
Mounjaro vs Wegovy vs Ozempic – Key Differences
| Feature | Mounjaro | Wegovy | Ozempic |
|---|---|---|---|
| Active ingredient | Tirzepatide | Semaglutide | Semaglutide |
| Mechanism | Dual action – GLP-1 & GIP receptor agonist | GLP-1 receptor agonist | GLP-1 receptor agonist |
| Approved use | Weight loss (UK/EU 2024), type 2 diabetes (US) | Weight loss (UK 2023) | Type 2 diabetes (UK); used off-label for weight loss |
| Typical doses available | 2.5mg → 15mg (weekly) | 0.25mg → 2.4mg (weekly) | 0.25mg → 2mg (weekly) |
| Effectiveness | High – some studies suggest greater weight loss than Wegovy | Proven effective for long-term weight loss | Effective for diabetes, also aids weight loss (though lower doses than Wegovy) |
| Side effects | Nausea, vomiting, diarrhoea, constipation, reduced appetite | Nausea, bloating, diarrhoea, fatigue, headache | Similar to Wegovy: nausea, constipation, acid reflux, appetite reduction |
| Price & availability in UK | Recently increased by ~170% (supply shortages) | Stable pricing, good availability | More available but not licensed for weight loss (mainly prescribed for diabetes) |
Why Has the Price of Mounjaro Increased in the UK?
As of September 2025, the manufacturer of Mounjaro has increased UK prices by around 170%. This rise is linked to global supply issues and the high demand for the medication. As a result, there is currently a nationwide shortage, making it more difficult for clinics to consistently source Mounjaro pens.
At our London clinic, we continue to offer Mounjaro to existing and new patients, but we also discuss alternatives such as Wegovy or even Ozempic, depending on availability and individual needs.
Benefits Beyond Weight Loss
Both Mounjaro and Wegovy are primarily prescribed for weight management, but many patients report additional health improvements, including:
Better control of type 2 diabetes and blood sugar levels.
Improvements in cardiovascular health, such as lower cholesterol and reduced blood pressure.
Improved mobility and joint health due to reduced strain on the body.
Increased confidence, energy, and motivation to maintain lifestyle changes.
What Diet Should You Follow While on Weight Loss Injections?
A question we hear often is: “Do I still need to diet if I’m on Mounjaro or Wegovy?”
The answer is yes — while these injections reduce appetite, the best results come when combined with a balanced diet.
Our recommendations for patients:
Focus on lean protein (chicken, fish, eggs, tofu) to preserve muscle mass.
Incorporate high-fibre foods (vegetables, fruit, whole grains) for digestion and satiety.
Stay hydrated with plenty of water.
Avoid high-sugar and processed foods which can slow progress.
Eat smaller, balanced meals rather than large portions.
These adjustments not only help with weight loss but also enhance overall health while on treatment.
Which Treatment is Right for You?
Both Mounjaro and Wegovy are excellent options for patients seeking effective weight loss injections in London.
If you want access to one of the newest and most powerful dual-action medications, Mounjaro may be right for you — though availability and cost are important factors to consider.
If you’re looking for a more established treatment with a steady UK supply, Wegovy is a fantastic choice.
Some patients also consider Ozempic (another form of semaglutide), though it is primarily licensed for type 2 diabetes management in the UK.
Final Thoughts
Weight loss injections such as Mounjaro, Wegovy, and Ozempic are transforming the way patients approach obesity and weight management in the UK. While Mounjaro prices have recently increased, both medications remain powerful tools in achieving sustainable weight loss and improving overall health.
If you’re based in London and considering medical weight loss support, our clinic team is here to guide you through your options and find the best plan for your goals.
Contact us today to book a consultation and take the first step towards a healthier future.
