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
Is Mounjaro Going Up In Price?
Yes, Mounjaro prices have increased across the UK in recent months. The cost of tirzepatide (the active ingredient in Mounjaro) through private prescribing services is rising due to increased demand, supply chain factors, and manufacturer pricing adjustments. NHS access through specialist weight management services is free, but waiting lists remain substantial in most regions. Understanding your options — both NHS and private — can help you plan ahead if you're considering this treatment.
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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.
Why Are Mounjaro Prices Increasing?
Several factors are driving Mounjaro price increases in the UK. Global demand for tirzepatide has surged since NICE approval and media coverage increased public awareness. Supply constraints in the early phases of scaling production have kept costs elevated. Additionally, manufacturer Eli Lilly has adjusted UK pricing to reflect market conditions and pharmaceutical industry inflation. Private prescribing services pass these costs directly to patients, so rises at the manufacturer level translate immediately to higher patient fees. Doses typically range from £129–£320 per month depending on your current tirzepatide dose and the provider you use. The starting dose (2.5 mg) is usually cheaper than maintenance doses (10 mg, 12.5 mg, 15 mg). Some services offer package discounts for longer-term commitments, while others charge per-pen basis.
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 Access vs Private Cost Options
NHS access to tirzepatide is free but requires referral to a tier 3 specialist weight management service through your GP — availability varies dramatically by region and waiting times can exceed 12–18 months. Private online prescribing services offer faster access without NHS waiting lists, but you pay directly. Before purchasing privately, check your GP eligibility; you may qualify for NHS provision sooner than expected. Our free GLP-1 weight loss calculator can help you understand potential outcomes at different tirzepatide doses, so you can make an informed decision about whether private investment aligns with your weight loss goals.
- 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 in the UK privately?
Private Mounjaro (tirzepatide) typically costs £129–£320 per month depending on your dose. The 2.5 mg starting dose is cheaper; higher maintenance doses (10–15 mg) cost more. Prices vary between providers and may be rising. Always check current pricing with your chosen prescribing service before committing.
Is Mounjaro free on the NHS?
Yes, Mounjaro is free on the NHS through specialist weight management services (tier 3). However, you must be referred by your GP and meet eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions). Waiting lists are substantial — often 12–18 months or longer depending on your region.
Why is Mounjaro becoming more expensive?
Rising prices reflect global demand surge, supply chain constraints, and manufacturer pricing adjustments by Eli Lilly. Private services reflect these manufacturer costs directly to patients. NHS provision remains free regardless of cost increases, though access is limited by waiting lists and regional availability.
What's the cheapest way to access tirzepatide?
The NHS offers free tirzepatide through specialist services, but involves waiting and GP referral. Private prescribing is faster but costs £129–£320/month. Compare both options with your GP first — you may qualify for NHS access sooner than expected, making it the most cost-effective long-term choice.
Will Mounjaro prices keep rising?
It's likely prices will remain elevated or rise further as global demand continues and supply stabilises at higher levels. NHS access remains free. If considering private treatment, locking in early may be cost-effective, but discuss NHS options with your GP first to avoid unnecessary private spending.
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.