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
What Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) costs vary significantly depending on whether you access it through the NHS or privately in the UK. Private prescription costs typically range from £130 to £320 per month depending on the dose, whilst NHS access is free at point of care but often involves lengthy waiting lists for specialist weight management services. Understanding your options and what to expect financially can help you make an informed decision about whether this prescription-only injection is right for you.
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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.
Mounjaro Pricing: Private vs NHS Routes
Private prescription costs for Mounjaro in the UK:
- Lower doses (2.5–5 mg): approximately £130–£180 per month
- Mid-range doses (7.5–10 mg): approximately £180–£240 per month
- Higher doses (12.5–15 mg): approximately £240–£320 per month
Each KwikPen contains four weekly injections (one month's supply). Private prescriptions are issued by UK-licensed prescribers following an online clinical assessment. Prices vary between GPhC-registered pharmacies, so comparing options is recommended. NHS access is free but typically requires referral to a tier 3 specialist weight management service through your GP, with availability varying significantly by region. Some areas have waiting lists exceeding 12–18 months.
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.
How to Access Mounjaro: The Online Consultation Process
To obtain Mounjaro privately, you'll complete an online consultation with a UK-licensed prescriber. You'll provide medical history, current medications, weight, height, and BMI. The prescriber assesses whether Mounjaro is clinically appropriate for you based on NHS eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions). If approved, a prescription is issued to a GPhC-registered pharmacy, which dispenses your KwikPen. The entire process typically takes 24–48 hours. Alternatively, ask your GP about NHS referral to specialist services, though expect significant waiting times in most regions.
- 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.
Does the NHS provide Mounjaro for free?
Yes, Mounjaro is free through the NHS when prescribed by a specialist weight management service (tier 3). However, access is limited and varies by region. Most areas have substantial waiting lists. Your GP can refer you to local specialist services, but you may wait many months for assessment and prescription.
Is Mounjaro cheaper than Wegovy in the UK?
Prices are comparable. Both typically cost £130–£320 per month privately depending on dose. Mounjaro's higher maximum dose (15 mg vs Wegovy's 2.4 mg) may affect final pricing. Compare quotes from different pharmacies as prices vary. Use our free BMI calculator to confirm your eligibility before consulting a prescriber.
Can I get Mounjaro on prescription without going private?
Yes, through NHS tier 3 specialist weight management services. Request a referral from your GP if you meet eligibility criteria (BMI ≥30 or ≥27 with comorbidities). NHS prescription is free, but waiting lists are lengthy in most areas. Private access is faster but comes with a monthly cost.
What's included in the Mounjaro monthly cost?
The monthly cost covers one KwikPen (four weekly injections). It does not include GP consultations, blood tests, or monitoring. Some private providers offer monitoring packages separately. NHS prescriptions include support from specialist services at no additional cost.
Are there cheaper alternatives to Mounjaro for weight loss in the UK?
Wegovy (semaglutide) is similarly priced. Saxenda (liraglutide) is a daily injection alternative, also prescription-only. Lifestyle changes—diet and exercise—remain the lowest-cost first step. Our free GLP-1 weight loss calculator can help you estimate potential outcomes before deciding whether medication is right for you.
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.