The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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Private Weight Loss Clinics in London: Prescription Medication Options
If you're searching for private weight loss clinic services in London, you have several options available to you. In the UK, prescription weight management medication is accessible through both NHS specialist services and private clinics. This guide explains the prescription weight loss options available, who is eligible, and how to access treatment in London whether through the NHS or privately. Understanding your options helps you make an informed decision about which route suits your circumstances and health needs best.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
UK-Licensed Prescription Weight Management Medications
Three prescription-only weight management medications are currently licensed in the UK: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). Mounjaro and Wegovy are once-weekly injections, while Saxenda is a daily injection. Clinical trials have demonstrated that these medications may support weight loss when combined with dietary changes and increased physical activity. On average, participants in trials lost between 14–21% of their body weight, though individual results vary significantly.
- Mounjaro: Dual GIP and GLP-1 receptor agonist, doses 2.5–15 mg weekly
- Wegovy: GLP-1 receptor agonist, doses 0.25–2.4 mg weekly
- Saxenda: GLP-1 receptor agonist, 0.6–3 mg daily
Eligibility typically requires a BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. Our free BMI calculator can help you determine your BMI instantly. Our GLP-1 weight loss calculator can also project potential weight loss outcomes at different doses.
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No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS vs Private Access in London
NHS access: NICE has approved tirzepatide for use within NHS specialist weight management services. Access is through tier 3 or 4 services, typically following a GP referral. Availability varies by region, and NHS waiting lists can be lengthy in London and other areas.
Private access: Private weight loss clinics in London offer prescription weight management medications following an online or in-person clinical assessment with a UK-licensed prescriber. Private clinics provide faster access without NHS waiting lists. Treatment is dispensed by GPhC-registered pharmacies. Your GP can discuss both options and help you determine if prescription medication is appropriate for your circumstances. Always ensure any private clinic is regulated and employs qualified healthcare professionals.
Next steps: Book an appointment with your GP to discuss whether prescription weight loss treatment is suitable for you. Your GP can refer you to NHS specialist services if eligible, or advise on regulated private options in London. Whether you choose NHS or private, treatment works best alongside sustainable dietary changes, increased physical activity, and behavioural support. Use our free progress tracker to monitor your weight loss journey once you begin treatment.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
What prescription weight loss medications are available privately in London?
The main options are Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). All are prescription-only and available through private clinics following clinical assessment. Mounjaro and Wegovy are once-weekly injections, while Saxenda is daily. Each has different eligibility criteria and dose ranges. Your prescriber will assess which is most appropriate for you.
How much does private weight loss treatment cost in London?
Costs vary by clinic and medication dose. Typically, private prescription weight management ranges from £129–£320 per month depending on the medication and dose. Initial consultations may cost £50–£150. Always ask about total costs upfront, including follow-up consultations and prescription fees, before committing to treatment.
Can I get weight loss medication on the NHS in London?
Yes, but access is through specialist tier 3 or 4 weight management services. Your GP can refer you if you meet eligibility criteria (BMI ≥30 or ≥27.5 with health conditions). NHS waiting lists in London can be very long. Many people choose private options for faster access.
What eligibility criteria apply for prescription weight loss medication?
Generally, you need a BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions like type 2 diabetes, high blood pressure, or cardiovascular disease. South Asian, Chinese, Black African, and Black Caribbean adults may qualify at lower BMI thresholds. Use our BMI calculator to check your BMI, then discuss eligibility with your GP or private prescriber.
Do private weight loss clinics in London require a GP referral?
No. Private clinics do not require a GP referral — you can book directly. However, it's still recommended to inform your GP that you're considering prescription weight loss treatment, as your doctor may have relevant health information and can monitor your progress. Your GP can also advise on whether medication is appropriate for your personal health circumstances.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.