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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Mounjaro Weight Loss: How to Access & Cost in the UK
People searching for "Mounjaro forum weight loss" often want to know how to access this prescription-only weight loss injection in the UK and what it costs. Mounjaro (tirzepatide) is a once-weekly injectable medication that may help with weight management when combined with lifestyle changes. There are two main routes to access it in the UK: through NHS specialist weight management services, or via private online prescribing. The cost, waiting times, and eligibility vary significantly between these routes. This guide covers both pathways and what you can realistically expect.
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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.
Private Access Route: Costs & Online Prescribing
Private online prescribing is currently the fastest way to access Mounjaro in the UK without an NHS referral. After an online clinical assessment with a UK-licensed prescriber, a prescription is issued and dispensed by a GPhC-registered pharmacy. Typical private costs range from £129 to £320 per month depending on your dose — lower doses like 2.5 mg and 5 mg cost less, while higher doses (10 mg, 15 mg) cost more. Each KwikPen contains four weekly injections. Some private providers offer loyalty discounts or subscription savings, reducing monthly costs by 10–15%. Important: costs are subject to change and vary between providers. You should not pay upfront for multiple months — reputable providers invoice monthly. Private prescribers will assess whether Mounjaro is suitable based on your weight, BMI, health history, and any weight-related conditions.
Clinically BackedWeight Loss
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 Route: Referral, Waiting Lists & NICE Guidance
NHS access to Mounjaro is through specialist tier 3 or tier 4 weight management services, following NICE approval of tirzepatide. You'll typically need a GP referral to your regional Integrated Care Board (ICB) weight management service. If approved by NHS specialists, Mounjaro is provided free at point of use. However, NHS waiting lists vary dramatically by region — some areas have waiting times of 6–12 months or longer, whilst others may have shorter queues. During this time, you may be offered tier 2 services including dietary counselling and behaviour change support. Not all ICBs have Mounjaro immediately available; some are still implementing it. Your GP practice holds current information about your local NHS weight management pathway. Try our free GLP-1 weight loss calculator to explore potential outcomes at different doses whilst you consider your access route.
- 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.
How much does Mounjaro cost privately in the UK per month?
Private Mounjaro costs typically range from £129 to £320 per month depending on dose. The starting dose (2.5 mg) is usually cheaper, whilst maximum doses (15 mg) cost more. Prices vary between providers and may include subscription discounts. Always confirm pricing before committing, and avoid upfront payment for multiple months.
Can I get Mounjaro free on the NHS in the UK?
Yes, if approved through an NHS specialist weight management service, Mounjaro is provided free. You need a GP referral to your local tier 3/4 weight management service. NICE has approved tirzepatide (Mounjaro) for NHS use. However, waiting times vary significantly by region — from weeks to over a year in some areas.
What is required for a private Mounjaro prescription in the UK?
You need a clinical assessment with a UK-licensed prescriber (usually online). You'll be asked about your weight, height, BMI, health conditions, medications, and weight management history. If suitable, a prescription is issued. You must be at least 18 years old and not pregnant or breastfeeding. Assessment fees are typically £20–£50.
How long does it take to get Mounjaro via private prescribing?
Private online consultations are usually completed within 24–48 hours. If approved, your prescription is sent to a pharmacy and dispatched within 1–3 working days. This means you could receive your first KwikPen within a few days of starting the process — much faster than NHS routes.
Is Mounjaro the same as Wegovy, and which is cheaper in the UK?
No. Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist; Wegovy (semaglutide) is a GLP-1 agonist only. Both are weekly injections and available privately or through NHS services. Private costs are similar (£100–£350/month). Clinical trials show Mounjaro may produce slightly higher average weight loss, but results vary individually. Your prescriber will help choose what's suitable for you.
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.