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 Cost in the UK — Where to Find Affordable Access
Finding affordable Mounjaro in the UK means understanding both NHS and private access routes. Mounjaro (tirzepatide) is a prescription-only weight management injection, and the cost varies significantly depending on whether you access it through the NHS or a private prescription. This guide explains your options, realistic pricing, and what to expect during the clinical assessment process so you can make an informed decision about your weight management journey.
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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.
Understanding Mounjaro Pricing in the UK
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on your dose and the provider. Starting doses (2.5 mg to 5 mg) are generally at the lower end, while higher maintenance doses (10 mg to 15 mg) cost more. Each KwikPen contains four weekly injections, so pricing is usually per four-week supply.
- 2.5 mg starting dose: approximately £129–£150/month
- 5–7.5 mg doses: approximately £160–£200/month
- 10 mg+ doses: approximately £220–£320/month
These figures are indicative and vary between GPhC-registered pharmacies. Some providers offer package discounts or loyalty schemes. Unlike Mounjaro vs Wegovy pricing comparisons, tirzepatide may offer cost advantages at higher doses due to its dual GIP/GLP-1 mechanism requiring potentially fewer adjustments. Always request a quote before committing, as prices change and providers differ.
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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 — Which Route Is Right for You?
NHS access is free at the point of use but involves referral to a specialist tier 3 or tier 4 weight management service. Mounjaro eligibility on the NHS requires a BMI of 30+ (or 27+ with weight-related health conditions), and NICE has approved its use within specialist services. However, NHS availability varies dramatically by region, and waiting lists can extend several months or longer in many areas.
Private access is faster — typically available within days of your online clinical assessment — but you pay the full cost. You'll need a UK-licensed prescriber to assess your medical history and suitability. No NHS referral is required. Private prescription routes work well for people who want immediate access and can afford the monthly cost. Use our free GLP-1 weight loss calculator to explore potential outcomes before committing to either route.
Starting an online prescription through a private provider involves: completing a detailed health questionnaire, having a video or phone consultation with a UK-licensed prescriber, receiving a prescription if clinically appropriate, and having your medication dispensed by a GPhC-registered pharmacy. The entire process typically takes 24–72 hours from start to first delivery. Prescribers will assess your BMI, medical history, medications, and weight-related health conditions to ensure Mounjaro is suitable. Be honest about any gallbladder, pancreatic, or thyroid concerns, as these may affect eligibility. Your prescriber will also discuss dose titration schedules and expected side effects, helping you prepare for the injection process and any lifestyle changes needed for best results.
- 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.
Is Mounjaro cheaper on the NHS than through private prescription?
Yes — Mounjaro is free on the NHS, but access requires referral to a specialist weight management service and can involve months of waiting. Private prescription costs £129–£320/month depending on dose. NHS access is free but slower; private is faster but paid. Choose based on your budget and timeline.
Why does Mounjaro cost more at higher doses?
Each KwikPen contains four weekly injections, and higher doses (10 mg, 12.5 mg, 15 mg) use more active ingredient, increasing manufacturing and supply costs. Starting doses are cheaper because you need less medication per injection initially during dose titration.
Can I get Mounjaro prescribed by my GP without waiting for specialist services?
Not typically. Mounjaro on the NHS is prescribed through specialist tier 3 or tier 4 weight management services, not routine GP prescriptions. Private prescription routes bypass this, but require payment. Your GP can refer you to specialist services if you're eligible.
What happens if I can't afford the full private prescription cost?
Some private providers offer payment plans, quarterly discounts, or loyalty schemes — ask when you enquire. Alternatively, ask your GP about NHS specialist services in your area, though waiting lists vary widely by region. Our free BMI calculator can help you assess whether you're eligible for either route.
Will my private Mounjaro prescription be recognised by the NHS if I later switch?
No — private prescriptions and NHS prescriptions are separate routes. If you switch from private to NHS, you'd need a new NHS assessment and prescription through specialist services. Conversely, switching from NHS to private doesn't require NHS involvement. Discuss continuity of care with your GP if considering a switch.
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.