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
Free tracker included with every download this week
Where Can I Get Mounjaro Cheap in the UK?
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private online prescribing routes, with costs varying significantly depending on which pathway you choose. NHS access is free but involves long waiting lists in many areas, whilst private prescription routes offer faster access at a cost. Understanding your options, eligibility, and what to expect at different doses can help you make an informed decision about 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 Prescription Cost Context for Mounjaro in the UK
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on the dose you're prescribed and the provider you use. Starting doses (2.5 mg) are usually at the lower end of this range, whilst maintenance doses (10 mg to 15 mg) cost more. Each KwikPen contains four weekly injections, so you'll be purchasing a month's supply at a time. Prices can vary between different GPhC-registered online prescribing services, so it's worth comparing options. Many private providers offer dose titration guidance — gradually increasing your dose over several weeks — which means your first month may be cheaper than subsequent months as you move to higher doses. When budgeting, factor in that you may need to be on the medication for several months to see meaningful weight loss results. Use our GLP-1 weight loss calculator to estimate potential results at different doses, which can help justify the investment in 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 and What to Expect
The NHS route is free but requires referral to a tier 3 specialist weight management service through your GP — waiting lists can stretch 6–18 months in many areas depending on your region. NICE has approved tirzepatide for NHS use, but availability depends on your local Integrated Care Board (ICB). The private route involves an online consultation with a UK-licensed prescriber, typically costing £50–£150 for the consultation itself, then separate prescription costs from a GPhC-registered pharmacy. Private access is faster (often available within days) and doesn't require NHS referral. Both routes require eligibility assessment: a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. Check your eligibility using our free BMI calculator, then discuss your options with your GP or a private prescriber.
- 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's the cheapest way to get Mounjaro in the UK?
The NHS is free but involves waiting lists of months to years depending on your region. Private prescription is faster but costs £129–£320 per month depending on dose. Compare private providers to find competitive pricing, and factor in consultation fees (usually £50–£150). Starting on a lower dose can be more affordable initially.
Can I get Mounjaro on the NHS?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use within specialist tier 3 weight management services. You'll need a GP referral and must meet eligibility criteria: BMI 30+, or 27–29.9 with weight-related conditions. Availability and waiting times vary significantly by region.
Do private Mounjaro prescriptions require a doctor's assessment?
Yes, all prescription routes require a clinical assessment by a UK-licensed prescriber. Private online consultations involve answering health questions and may include a video appointment. The prescriber assesses your eligibility, medical history, and suitability before issuing a prescription.
Is private Mounjaro the same strength as NHS Mounjaro?
Yes, private and NHS Mounjaro contain the same tirzepatide and are available in identical doses (2.5 mg to 15 mg). The only difference is the route and waiting time — the medication itself is identical regardless of how you access it.
What if I can't afford the private cost?
Consider asking your GP about NHS specialist weight management services, even with waiting lists. Some services offer free tier 1 or 2 support whilst you wait (digital tools, behaviour change programmes). Some private providers offer payment plans. Our weight loss calculator and BMI tool can help you track progress with other methods whilst accessing 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.