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 Price in the UK — What You Need to Know
Mounjaro (tirzepatide) pricing in the UK depends on whether you access it through the NHS or privately. Private prescription costs typically range from £129 to £320 per month depending on your dose, while NHS access is limited to specialist weight management services with varying availability across regions. Understanding your options — including the online consultation process, dose progression, and how costs compare to alternatives like Wegovy — can help you make an informed decision about prescription weight loss treatment in the UK.
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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 Mounjaro Costs in the UK
Private prescription costs for Mounjaro in the UK typically range from approximately £129 to £320 per month, varying significantly by dose strength. Starting doses (2.5 mg) are usually at the lower end of this range, while the maximum dose of 15 mg costs more. Each KwikPen contains four weekly doses (one month's supply). Costs also vary between GPhC-registered online pharmacies, so comparing providers is advisable.
- 2.5 mg dose: approximately £129–£150/month
- 5–7.5 mg doses: approximately £160–£200/month
- 10–15 mg doses: approximately £250–£320/month
Private access avoids NHS waiting lists and doesn't require a GP referral to specialist services. However, you must pass a clinical assessment with a UK-licensed prescriber before a prescription is issued. Online consultations typically take 15–20 minutes and assess your eligibility, medical history, and suitability for tirzepatide treatment.
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 vs Private Access Routes
NHS access is available through specialist tier 3 and tier 4 weight management services, but availability varies dramatically across England, Scotland, Wales, and Northern Ireland. NICE has approved tirzepatide for use within NHS specialist weight management, yet many regions have long waiting lists (sometimes 12–24 months) and strict eligibility criteria. Private access is faster — typically available within days of consultation — but involves direct costs. Your GP can advise whether you meet NHS criteria and can make a referral, though private treatment doesn't require NHS involvement. Consider your urgency, budget, and local NHS availability when choosing your 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?
Private Mounjaro costs between £129 and £320 per month depending on dose strength. Starting doses (2.5 mg) cost around £129–£150/month, while the maximum 15 mg dose costs £250–£320/month. Prices vary between GPhC-registered online pharmacies, so it's worth comparing. Each KwikPen contains four weeks of injections.
Can I access Mounjaro through the NHS?
Yes, Mounjaro is approved by NICE for use within NHS specialist weight management services. However, access is limited and varies by region. You'll need a GP referral to your local tier 3 or tier 4 weight management service. Waiting lists can be lengthy in many areas, sometimes 12–24 months, so check availability in your region.
What's included in the Mounjaro price?
The monthly cost covers a four-week supply (four KwikPen injections). The price typically includes the medication only — not GP appointments or follow-up consultations. Some private providers include follow-up assessments, so check what's included with your chosen pharmacy before paying.
How does Mounjaro cost compare to Wegovy in the UK?
Costs are similar — both range from approximately £129 to £320/month depending on dose. Mounjaro may be slightly cheaper at lower doses in some cases, but prices vary by pharmacy and dose strength. Clinical trial data suggests Mounjaro may provide slightly higher average weight loss than Wegovy, though individual results vary significantly.
What happens after my Mounjaro prescription expires?
Once you've started Mounjaro, you'll need ongoing prescriptions from your healthcare provider for continued treatment. Private providers typically offer follow-up consultations (sometimes paid separately, sometimes included) to assess your progress and decide whether to continue, increase dose, or stop treatment.
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.