What is Mounjaro? Your guide to the weight loss medicine

If you’ve been trying to lose weight and finding it difficult to see results, you’re not alone. Many people face challenges with weight loss even when they’re doing their best to eat well and stay active. 

At London Medical, we understand that sustainable weight loss sometimes needs more than just willpower alone – it needs expert support and a unique medical weight loss plan designed around your needs.

This is where medical treatments like Mounjaro can help. This new type of weight loss injection offers an effective option for people looking to manage their weight and feel more in control of their health. 

In this article, we explain what Mounjaro is, how it works, who it may be suitable for and more.

What is Mounjaro?

Mounjaro is a prescription injectable medication that was originally developed to treat type 2 diabetes. However, it is now being used to support weight loss, thanks to how it works in the body. 

Mounjaro contains an active ingredient called tirzepatide, which mimics two natural hormones that help control appetite and blood glucose (blood sugar) levels.

These hormones can: 

• slow how quickly food leaves your stomach
• help you feel fuller and satisfied for longer
• reduce your overall appetite

This means when taking Mounjaro, you may naturally eat less, which supports healthy long-term weight loss. 

Mounjaro works best as part of a personalised support plan that includes guidance on eating well, staying active and regular check-ins with our specialist team.

How does Mounjaro help with weight loss?

Mounjaro works with your body’s natural processes, making it easier to manage hunger and feel full. When used alongside positive lifestyle changes, this can lead to noticeable and sustained weight loss – especially when lifestyle shifts alone haven’t worked. 

In a large clinical trial, 85% of participants who were overweight or living with obesity lost at least 5% of their body weight over 72 weeks while using Mounjaro. The study involved gradually increasing the dose from 5mg to 15mg.

It’s worth noting that Mounjaro works best when combined with healthy habits. Eating well, staying active and having the right support around you all play a role in helping you lose weight and keep it off. If you regularly eat more calories than your body needs, you might find it harder to lose weight – even while taking Mounjaro. 

At London Medical, we offer Mounjaro injections as part of a comprehensive weight management programme. We start with a detailed assessment to check if it’s the right choice for you. If it is, we create a tailored plan that includes expert medical advice and ongoing support to guide you every step of the way.

Who is Mounjaro suitable for?

Mounjaro may be right for you if:

• you have a body mass index (BMI) over 30
• your BMI is over 27 and you have a weight-related condition like high cholesterol, sleep apnoea or polycystic ovary syndrome (PCOS)
• you’ve found it hard to lose weight through lifestyle changes alone
• you’re looking for a medical approach that doesn’t involve weight loss surgery
• you have dyslipidaemia (abnormal fat levels in the blood)
• you’ve been diagnosed with hypertension (high blood pressure)
• you have obstructive sleep apnoea (where breathing stops and starts during sleep)
• you have cardiovascular disease, affecting the heart and blood vessels
• you’ve been diagnosed with type 2 diabetes

Before prescribing Mounjaro, one of our consultants will explain the potential benefits and limitations of the treatment, including any possible side effects. 

We’ll also discuss the lifestyle changes needed alongside Mounjaro, such as eating a balanced, reduced-calorie diet and staying physically active, so the treatment forms part of a structured and effective weight management plan.

If you’re taking the contraceptive pill, you may need to use additional protection such as condoms, as Mounjaro can affect how the pill is absorbed. If you’re on hormone replacement therapy (HRT), your clinician may recommend using a patch or gel to make sure the treatment is effective.

Who shouldn’t take Mounjaro?

Mounjaro is not recommended if you are pregnant, planning a pregnancy, breastfeeding or have certain health conditions. Your consultant will talk you through the risks and help you decide if it’s the right option for you.

How do I take Mounjaro?

Mounjaro is taken once a week using a small injection pen. You’ll give the injection yourself at home, usually in your stomach or thigh. The pen injector is designed to be easy to use, and we’ll show you exactly how it works so you feel confident from the start.

Your dose will be increased slowly over time. This helps your body adjust to the medicine and lowers the chance of side effects. Your consultant will check in regularly to make sure the treatment is working well and answer any questions you may have.

Side effects of Mounjaro

Like all medicines, Mounjaro can cause side effects for some people, although these are often mild and improve over time.

The most common side effects include:

• feeling sick
• diarrhoea or constipation
• tiredness
• loss of appetite
• redness or discomfort at the injection site

These effects usually ease as your body adjusts, especially when the dose is increased gradually. Throughout your treatment, your clinician will be there to support you with regular check-ins, helping to manage any symptoms and keep your progress on track.

More serious side effects are rare, but they can occur. That’s why it’s important to take Mounjaro as part of a carefully monitored programme led by experienced healthcare professionals.

How does Mounjaro compare to other weight loss treatments?

Mounjaro is part of a newer group of medicines that target the hormones involved in appetite control. It works similarly to semaglutide, used in treatments like Wegovy, but Mounjaro targets two hormones instead of one. This may lead to greater weight loss for some people.

Unlike short-term diets or unregulated slimming products, Mounjaro is backed by strong clinical evidence and delivered with expert support. At London Medical, we don’t just prescribe medicine – we help you make informed, lasting changes to your health.

Is Mounjaro available on the NHS?

Mounjaro is currently approved on the NHS for treating type 2 diabetes. Its use for weight loss is limited within NHS services, meaning you may only be able to access it privately if you don’t have diabetes.

We offer Mounjaro as part of a tailored weight management programme for adults who meet the criteria and could benefit from medical support. Our approach is focused on your health and long-term wellbeing, not just short-term weight loss.

Start your weight loss journey today

At London Medical, you’ll be supported by leading experts in weight management. We take time to understand your goals, your lifestyle and what matters most to you.

From making sure Mounjaro weight loss injections are right for you to teaching you how to use the injector pen, we’ll be here to support you at every stage. 
Take the first step towards feeling more in control of your weight and your health. Contact London Medical to find out if Mounjaro could be part of your personalised weight management plan.