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 Prices in the UK
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS specialist services and private prescribing. Prices vary significantly depending on where you access treatment, your dose level, and whether you're using NHS or private services. This guide explains current UK pricing, what affects costs, and how to understand the investment involved in this prescription weight management option.
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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.
What Does Mounjaro Cost?
Private pricing in the UK typically ranges from £129 to £320 per month, depending on the dose and provider. The starting dose (2.5 mg) is usually the least expensive, while higher doses (10 mg, 15 mg) cost more. Each KwikPen contains four weekly injections, so you'll need one pen per month at standard dosing.
- 2.5 mg dose: approximately £129–£160/month
- 5 mg dose: approximately £150–£180/month
- 10 mg dose: approximately £240–£280/month
- 15 mg dose: approximately £280–£320/month
NHS access is free at point of care once prescribed, but availability is limited to specialist tier 3/4 weight management services, and waiting lists can be lengthy depending on your region. Your GP can refer you to your local NHS weight management service to discuss eligibility and potential waiting times.
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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.
Factors That Affect Mounjaro Costs
Several factors influence what you'll pay for Mounjaro privately. Dose titration means you start at 2.5 mg and increase gradually every 4 weeks, so your monthly cost may vary during the first 5–6 months as you reach your target dose. Private providers also vary in pricing; some offer lower costs for longer-term commitments. Additional costs may include the initial online consultation (typically £20–£50) and repeat prescriber assessments every 3–6 months (£15–£40). Always compare providers and ask about package pricing before committing to 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.
Is Mounjaro available on the NHS?
Yes, Mounjaro (tirzepatide) is NICE-approved for NHS use within specialist weight management services (tier 3/4). However, availability is limited and varies significantly by region. You'll need a GP referral and typically face waiting lists of several months to over a year in many areas.
What's the difference between Mounjaro and Wegovy prices?
Mounjaro typically costs £129–£320/month privately depending on dose. Wegovy (semaglutide) usually ranges from £120–£280/month. Costs vary by provider, and both require dose titration, so your price may change as you increase doses. Compare providers directly for current pricing.
Can I switch between private and NHS Mounjaro?
Once you start private Mounjaro, switching to NHS requires stopping the private prescription and being reassessed by NHS services with another waiting period. Similarly, if you start NHS treatment, switching to private involves seeing a private prescriber for a new assessment. Most people stay on their original pathway.
Does the cost include the KwikPen or just the medication?
Private prices quoted (£129–£320/month) typically include the pre-filled KwikPen device and the medication inside it. Always confirm this with your provider, as some may charge separately for clinical assessments or delivery fees.
Will Mounjaro prices change if I gain or lose weight during treatment?
No, pricing is based on your prescribed dose, not your weight loss progress. Your dose may increase or decrease based on your prescriber's assessment, which could affect future monthly costs, but short-term weight changes don't alter the price you pay.
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.