Weight Loss Injections in London. Doctor Led Mounjaro and Wegovy Care

Last updated May 2026

Medically reviewed by the GMC-registered doctors at The Online GP by The Wellness

Weight loss injections have become the largest and fastest moving area of private medicine in the UK. By mid 2025 more than 2 million people were paying privately for treatments like Mounjaro and Wegovy, with a further 3.3 million saying they intend to start within the year, according to figures reported from IQVIA and a 2026 UCL study published in BMC Medicine. The medicine works. The problem is that most people are getting it from a website with no doctor, no examination and no monitoring. This guide explains how to do it properly in London.

Want a doctor to assess whether weight loss treatment is right for you. Message The Online GP by The Wellness on WhatsApp or email team@thewellnesslondon.com.

What are weight loss injections and do they work

Weight loss injections are prescription medicines that reduce appetite and slow how quickly the stomach empties, which helps people eat less and lose weight. The two leading options in the UK are tirzepatide, sold as Mounjaro, and semaglutide, sold as Wegovy. In clinical trials they produce substantial, sustained weight loss when used alongside changes to diet and activity.

The evidence is strong. Trial data shows tirzepatide supporting an average weight loss of around 22.5 percent of starting body weight at the highest dose over 72 weeks, and in January 2026 the MHRA approved a higher 7.2 mg dose of Wegovy that brought it to within around two percentage points of that result. These are medicines made by Eli Lilly and Novo Nordisk, regulated by the Medicines and Healthcare products Regulatory Agency, and assessed by the National Institute for Health and Care Excellence. They are effective. They are also powerful drugs that need proper medical oversight.

Why doctor led treatment matters more than the lowest price

Doctor-led treatment matters because weight loss injections are not lifestyle products. They are prescription medicines with eligibility criteria, side effects and dose adjustments that need a real clinician. The Online GP by The Wellness provides GMC-registered doctor assessment, blood tests and ongoing monitoring, rather than a one-click online form.

Here is the uncomfortable reality of the cheapest end of the market. A website asks you to tick a few boxes, upload a photo, and a prescription is issued without anyone examining you, checking your bloods, or following up. That is how people end up on the wrong dose, miss an underlying thyroid or metabolic problem, or stop within months. Around half of patients drop off within twelve months, much of it because treatment was never set up to be sustainable. A doctor who knows your history, runs the right bloods, starts you safely and reviews you regularly is the single biggest factor in getting a result that lasts.

To start with a doctor who actually monitors you, enquire on WhatsApp here.

Who is eligible for weight loss injections

Weight loss injections are intended for people who meet clinical criteria, generally a body mass index of 30 or above, or 27 and above where there is a weight-related health condition such as type 2 diabetes, high blood pressure or sleep apnoea. A doctor confirms eligibility and rules out reasons the medicine would not be safe for you.

Eligibility is a clinical decision, not a self-assessment. NICE and the MHRA set thresholds, but the doctor also looks at the whole picture, your medical history, current medications, any history of pancreatitis or thyroid conditions, and whether something else is driving the weight, such as an underactive thyroid. This is exactly why The Online GP by The Wellness builds blood tests into the workup. Checking thyroid function, HbA1c, liver and kidney markers and more is not an upsell. It is how you treat the person rather than the number on the scales.

What does doctor led weight loss care at The Online GP by The Wellness involve

Doctor-led weight loss care at The Online GP by The Wellness involves a full assessment with a GMC-registered doctor, baseline blood tests, a safe starting dose, and structured reviews as the dose increases. You are treated as a patient on a medical programme, not a customer placing an order.

A typical pathway looks like this. First, a consultation in person at the Marylebone clinic or by video, where the doctor takes your history and confirms whether treatment is appropriate. Second, baseline bloods run through the in-house diagnostic service that shares the same clinic. Third, if suitable, a prescription at the correct starting dose with clear guidance on how to inject and what to expect. Fourth, regular reviews to manage side effects, adjust the dose and track progress. The same doctor and team stay with you, which is what turns a prescription into a result.

Ready to do this properly. Message us on WhatsApp and a doctor will talk you through it.

Mounjaro or Wegovy. Which is right for me

The right choice depends on your health, your goals and how your body responds, which is why this is a decision to make with a doctor rather than a website. Both Mounjaro and Wegovy are effective. Mounjaro works on two appetite pathways, Wegovy on one, and the gap between them has narrowed since the higher dose of Wegovy was approved in 2026.

Many people arrive convinced they need a specific brand because of something they read. That instinct is understandable, and the honest answer is that the best drug is the one that suits your body and that you can tolerate and stay on. A doctor weighs the trial evidence, your medical history, how you respond to the starting dose, and practical factors before recommending one. Self-prescribing a brand from a comparison page skips the part that actually matters, which is matching the medicine to you.

How much do weight loss injections cost privately

Across the UK private market, monthly costs for the medication itself commonly run from around 130 to 375 pounds depending on the drug and dose, after Eli Lilly raised UK list prices in late 2025. The value in a doctor-led programme is not only the medicine but the assessment, bloods and monitoring that make it safe and effective.

It is worth being clear-eyed about value here. The cheapest online supply can look attractive until you factor in the cost of a wrong dose, an undiagnosed condition, side effects no one helped you manage, or stopping early and regaining the weight. A programme that includes a doctor, the right bloods and proper follow-up is what protects the money you spend on the medicine. For an exact quote matched to your situation, the simplest step is to ask.

For a clear answer on what your treatment would involve, enquire on WhatsApp here or email team@thewellnesslondon.com.

What about side effects and safety

The most common side effects of weight loss injections are nausea, constipation and other digestive symptoms, which usually settle as the body adjusts and the dose is increased slowly. Less common but more serious risks exist, which is exactly why medical supervision matters. A doctor manages side effects, adjusts the dose and monitors you throughout.

Most side effects are manageable when treatment is started low and increased gradually under supervision. The doctor will discuss the full risk profile with you, including rarer concerns, and will check that the medicine is right alongside any other conditions or medications you take. This is medicine, not a shortcut, and treating it that way is how you stay safe. This article is for information and does not replace a personal consultation. Speak to a doctor before starting any treatment.

Frequently asked questions

Can I get weight loss injections in London with a doctor rather than online only

Yes. The Online GP by The Wellness provides in-person and video assessment with GMC-registered doctors in Marylebone, with blood tests and ongoing monitoring, rather than a website with no clinical oversight. Message on WhatsApp to enquire.

Do I need a blood test before starting

A baseline blood test is part of responsible care. It checks thyroid, metabolic, liver and kidney markers, confirms the medicine is appropriate, and rules out other causes of weight gain. The Online GP by The Wellness runs bloods through its own clinic.

Am I eligible for Mounjaro or Wegovy

Eligibility generally starts at a body mass index of 30, or 27 with a weight-related condition, but the final decision is made by a doctor after assessing your full history. Enquire and a doctor will tell you honestly whether treatment is suitable.

Is doctor led treatment worth more than a cheap online prescription

For most people, yes. The medicine is similar wherever you buy it. What differs is the assessment, the bloods, the dose management and the follow-up that make treatment safe and help the weight stay off. That is where a doctor-led programme earns its place.

How do I start

Send a WhatsApp message describing what you are looking for, and a GMC-registered doctor will arrange an assessment, usually the same week. Treatment only begins if it is clinically appropriate for you.

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