Weight Loss Injections in London: Your Complete Guide

Thinking about weight loss injections in London, but not sure where to begin? You are far from alone. In just a few years, medicated weight loss has gone from a specialist option to one of the most discussed treatments in UK healthcare. With new tablets now joining the familiar weekly pens, the choices can feel overwhelming. The right treatment depends on your health, your goals and how your body responds, which is why expert guidance matters from the very first conversation.

As a local community pharmacy, we offer a private weight management service with pharmacist support at every stage, from your first consultation through to dose changes and long term planning. If you would like to talk through your options, contact us, call our team or book an appointment today.

This guide explains how weight loss injections work, who they are suitable for, how Mounjaro and Wegovy compare, what is new for 2026, and how to manage side effects so you can stay consistent and confident.

What Are Weight Loss Injections?

Weight loss injections are prescription medicines that copy the action of natural gut hormones released after you eat. The best known of these hormones is GLP-1 (glucagon-like peptide-1), which signals to your brain that you have eaten enough and helps your body manage blood sugar.

By mimicking these hormones, weight loss injections can:

• Reduce appetite and the constant thoughts about food that many people describe as “food noise”
• Help you feel full sooner and stay satisfied for longer
• Slow down how quickly your stomach empties
• Support insulin release when blood sugar levels are raised
• Make it easier to stick to smaller portions and healthier choices

Many patients notice changes in their hunger within the first few weeks, although this varies from person to person. If you are curious about the timeline, our guide on how long it takes for Mounjaro to suppress appetite explains what to expect.

It is important to remember that these medicines are not a quick fix. They are licensed for use alongside a reduced calorie diet and increased physical activity. The NHS guidance on obesity treatment explains that weight loss medicines are one part of a wider plan that includes lifestyle support.

Who Can Have Weight Loss Injections?

Weight loss injections are not suitable for everyone, and a proper clinical assessment is essential before treatment begins. For private treatment, you will usually need to meet these criteria:

• Be aged 18 or over
• Have a BMI of 30 or above, or
• Have a BMI of 27 or above with at least one weight related condition, such as high blood pressure, type 2 diabetes, high cholesterol, sleep apnoea or heart disease

Lower BMI thresholds may be considered for people from South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean backgrounds, because weight related health risks can appear at a lower BMI in these groups. Your prescriber will talk this through with you.

Treatment may not be suitable, or may need extra caution, if you:

• Are pregnant, breastfeeding or planning a pregnancy
• Have a history of pancreatitis
• Have a personal or family history of medullary thyroid cancer or multiple endocrine neoplasia type 2 (MEN2)
• Have type 1 diabetes
• Have a current or past eating disorder
• Have severe stomach or bowel conditions, such as gastroparesis
• Have significant kidney, liver or gallbladder problems

During your consultation, we review your medical history, current medicines, weight, height and goals. This helps us recommend a treatment that is both safe and realistic for your circumstances.

Weight Loss Injection Options in London

The two most widely prescribed weight loss injections in the UK are Mounjaro and Wegovy. Both are weekly injections given under the skin using a pre-filled pen, but they work in slightly different ways and follow different dosing schedules.

Mounjaro (Tirzepatide)

Mounjaro contains tirzepatide, a dual action medicine that targets two hormone receptors: GLP-1 and GIP (glucose-dependent insulinotropic polypeptide). Acting on both pathways is thought to explain why many patients find Mounjaro particularly effective at controlling appetite.

Key points about Mounjaro:

• It is injected once a week, on the same day each week
• It comes in a KwikPen that holds four weekly doses
• Treatment starts at 2.5 mg a week for four weeks
• The dose can increase in 2.5 mg steps, at least four weeks apart, up to a maximum of 15 mg
• Many patients stay on a moderate maintenance dose if it is working well

The Mounjaro starting dose is designed to help your body adjust rather than produce maximum weight loss straight away. If you have wondered why you have to increase your Mounjaro dose gradually, the short answer is that slow increases reduce side effects and help you stay on treatment long enough to see results.

Where you inject also matters for comfort. Mounjaro can be injected into the stomach area, the thigh or the upper arm, and rotating your site each week helps prevent skin irritation. Our guide to Mounjaro injection sites covers this step by step.

Cost is often a deciding factor, especially since UK prices have changed over the past year. Our Mounjaro price comparison explains what to look out for when comparing providers.

Wegovy (Semaglutide)

Wegovy contains semaglutide, which acts on the GLP-1 receptor only. It has been widely used for weight management in the UK for several years and is also licensed to help reduce the risk of heart attack and stroke in some adults with existing heart disease and excess weight.

Key points about Wegovy:

• It is injected once a week using a FlexTouch pen
• Treatment starts at 0.25 mg a week for four weeks
• The dose then increases every four weeks through 0.5 mg, 1 mg and 1.7 mg
• The usual maintenance dose of 2.4 mg is reached after around 16 weeks
• Some patients stay on 1.7 mg if higher doses are not well tolerated

Our dedicated Wegovy dosing guide explains each stage in more detail, including what to do if side effects make a dose increase difficult.

Mounjaro vs Wegovy at a Glance

Both treatments can be very effective, and the better choice depends on your medical history, how you tolerate side effects, your budget and your goals. Our comparison of Mounjaro or Wegovy looks at this in depth, and our guide to the best injection for weight loss helps you think about which factors matter most to you.

New Weight Loss Options for 2026

Medicated weight loss is moving quickly, and 2026 has brought the first tablet options for weight management in the UK. For people who dislike needles or would prefer a daily routine, these are important developments.

Foundayo (Orforglipron)

The UK became the first country in Europe to authorise orforglipron for weight management and type 2 diabetes. Sold as Foundayo, it is a once daily tablet that acts on the GLP-1 receptor.

• It is a small molecule medicine rather than an injectable peptide
• It is taken by mouth once a day
• It has been developed so it does not need to be taken with strict food and water timing rules
• Side effects are expected to be similar to other GLP-1 medicines, mainly affecting the stomach and bowel

Wegovy Tablets (Oral Semaglutide)

The UK regulator has also approved the first GLP-1 tablet for weight loss, a tablet form of Wegovy containing semaglutide, the same active ingredient as the weekly injection.

• It is taken once a day rather than once a week
• Oral semaglutide usually needs to be taken on an empty stomach with a small sip of water, waiting before eating, drinking or taking other medicines
• Your prescriber and the patient information leaflet will explain the exact instructions

Tablets will not be the right fit for everyone. Some people prefer the simplicity of one injection a week, while others would rather avoid needles altogether. If you are curious about how tablet treatments compare with injections, we are happy to talk you through the differences during a consultation.

What to Expect When You Start Treatment

Knowing what lies ahead can make the first few months feel much more manageable. A typical treatment journey looks like this:

1. Consultation: We assess your suitability, discuss your goals and agree on the most appropriate treatment.
2. Weeks 1 to 4: You start on the lowest dose. Appetite changes may begin, and mild side effects are common as your body adjusts.
3. Months 2 to 4: Your dose may increase step by step, depending on how you are responding and how well you are tolerating treatment.
4. Maintenance: Once you reach a dose that works for you, the focus shifts to steady progress and building lasting habits.
5. Long term planning: We review your progress regularly and discuss how long to continue and how to protect your results.

Weight loss is rarely a straight line. Some weeks you may lose more, other weeks the scales may barely move. Keeping a simple record helps you see the bigger picture, and our weight loss tracker is a helpful tool for monitoring your progress over time.

Alternatively, use our tool below to assess your starting point and gauge how much weight you could lose on injections:

Managing Nausea and Other Side Effects

Side effects are most common in the early weeks and just after a dose increase. For most people, they are mild to moderate and ease as the body adjusts. Common side effects include:

• Nausea, especially after meals or on injection day
• Diarrhoea or constipation
• Indigestion, bloating or reflux
• Tiredness
• Headaches
• Mild redness or irritation at the injection site

These practical tips can make a real difference:

1. Eat smaller portions. Cut your usual portion by around a third, eat slowly and stop as soon as you feel comfortably full.
2. Go easy on greasy food. Fried food, creamy sauces, takeaways and pastries sit in the stomach for longer and often make nausea worse.
3. Keep plain foods on hand. Toast, crackers, bananas, rice, soup, yoghurt and oats are often easier to tolerate when nausea flares up.
4. Sip fluids steadily. Small, regular sips work better than large amounts at once. Sugar-free electrolyte drinks can help if you are struggling.
5. Time your injection wisely. Some people feel worse in the first day or two after injecting, so choosing an evening or a quieter day can help. Keep to the same day each week once you find what works.
6. Stay upright after meals. Wait 30 to 60 minutes before lying down, and avoid heavy meals close to bedtime.
7. Do not skip meals completely. Long gaps can leave you feeling weak and lead to overeating later. Small, regular meals are gentler on your stomach. Low blood sugar is uncommon on these medicines alone, but the risk is higher if you also take insulin or sulfonylureas for diabetes.
8. Support your digestion. Increase fibre gradually, drink plenty of water and walk daily to help prevent constipation.

If side effects are affecting your work, sleep or ability to eat, you do not have to put up with them. We can review your plan and may suggest staying on your current dose for longer. Contact us for support.

Getting the Best Results From Treatment

Medication makes change easier, but the habits you build while taking it shape your long term results. Focus on these areas:

• Protein at every meal: Eggs, chicken, fish, Greek yoghurt, beans and lentils help protect muscle as you lose weight.
• Fibre and vegetables: These support digestion and help you feel full.
• Strength training: Two or more sessions a week help maintain muscle, strength and metabolism.
• Daily movement: Walking is simple, free and effective, and it can ease bloating too.
• Good sleep: Poor sleep can increase hunger and cravings.
• Moderate alcohol: Alcohol adds calories and may worsen nausea and dehydration.

Motivation naturally rises and falls, particularly once the early excitement fades or progress slows. Our guide to weight loss motivation shares practical ways to stay focused when things feel harder.

NHS or Private Weight Loss Injections?

Weight loss injections are available on the NHS for some people, but access is limited and eligibility criteria are stricter. Many patients in London choose private treatment for faster access and more flexible support.

Staying Safe on Weight Loss Injections

Safety should always come first, both in where you get your medicine and in how you use it. Keep these points in mind:

• Only buy from a regulated provider. Avoid pens sold through social media, beauty salons or unregulated websites. These may be fake, contaminated or unlicensed, and the UK regulator has warned the public about them.
• Check your contraception. Mounjaro may make oral contraceptive pills less effective, and vomiting or diarrhoea can affect the pill too. A non-oral or barrier method is advised for four weeks after starting Mounjaro and for four weeks after each dose increase.
• Tell other healthcare professionals. Let your GP, dentist or anaesthetist know you are on treatment, particularly before surgery or procedures involving sedation.
• Review diabetes medicines. If you take insulin or sulfonylureas, your doses may need adjusting to reduce the risk of low blood sugar.
• Store pens correctly. Keep unused pens in the fridge and follow the leaflet for storing a pen at room temperature.
• Never share pens. This applies even with a new needle.

FAQs About Weight Loss Injections in London

Start Your Weight Loss Journey in London With Confidence

Weight loss injections can be a powerful tool when they are prescribed safely, started gradually and supported by realistic lifestyle changes. Whether you are weighing up Mounjaro and Wegovy, curious about the new tablet options or looking for help managing side effects, the right guidance makes the journey clearer and more sustainable.

Our team is here to support you with honest advice, careful prescribing and ongoing check-ins. Contact us with any questions, or book a consultation to explore weight loss injections in London with a pharmacist you can trust.