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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Exercise and Mounjaro in the UK — Cost and Access
If you're considering Mounjaro (tirzepatide) for weight management alongside exercise, understanding how to access it and what it costs is essential. Mounjaro is a prescription-only weight loss injection licensed in the UK, available through both NHS specialist services and private online prescribing. This guide explains the cost and access routes, helping you make an informed decision about whether this medication is right for your weight loss journey.
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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 Access and Cost in the UK
In the UK, private access to Mounjaro is available through GPhC-registered online pharmacies following a consultation with a UK-licensed prescriber. Private costs typically range from £129 to £320 per month depending on your dose, with prices varying between providers. The 2.5 mg starting dose is usually the least expensive, whilst higher maintenance doses (10 mg to 15 mg) cost more. Each KwikPen contains 4 weekly doses, so a monthly supply covers 4 weeks of treatment. Private prescribing offers faster access than NHS routes—often available within days—and doesn't require GP referral or waiting lists. However, you'll need to meet eligibility criteria: BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions like type 2 diabetes or hypertension. The online consultation assesses your medical history, current medications, and suitability for treatment before a prescription is issued. Some providers offer tiered pricing or package discounts for longer-term prescriptions.
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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.
NHS vs Private Routes and What to Expect
NHS access to Mounjaro for weight management is through specialist tier 3 or tier 4 weight management services, typically via referral from your GP. NICE has approved tirzepatide for NHS use, but availability varies significantly by region and integrated care board (ICB). NHS waiting lists can be lengthy—some areas report waits of several months to over a year—and access criteria are stricter than private routes. Once prescribed by the NHS, Mounjaro is free at point of use. Private routes are faster but require upfront payment. After your initial online consultation, a prescriber reviews your case within hours or days. If approved, your prescription is sent to a GPhC-registered pharmacy which dispenses and ships your Mounjaro KwikPen. You'll need to budget for ongoing costs alongside your exercise programme and any dietary changes. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses, and our BMI calculator to check your current eligibility status.
- 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 typically range from £129 to £320 per month depending on your dose. Starting doses (2.5 mg) are usually cheaper, whilst maintenance doses (10–15 mg) are more expensive. Prices vary between providers, and some offer package discounts for longer-term commitments. Each KwikPen contains 4 weekly doses.
Can I get Mounjaro free on the NHS in the UK?
Yes, Mounjaro is available free on the NHS through specialist weight management services, but access is limited and varies by region. You'll need GP referral to tier 3 services and must meet strict eligibility criteria. Waiting lists can be lengthy in many areas. Private routes offer faster access but require payment.
How long does it take to get Mounjaro through a private prescription?
Private access is typically much faster than NHS routes. After an online consultation, a prescriber usually reviews your case within hours or days. If approved, your prescription is sent to a GPhC pharmacy, and your KwikPen is usually dispatched within 1–2 working days.
Do I need to see my GP before getting Mounjaro privately?
No—private online prescribing doesn't require GP involvement. You complete an online consultation with a UK-licensed prescriber who assesses your medical history and suitability. However, it's good practice to inform your GP once you start Mounjaro, especially if you take other medications.
Is Mounjaro more effective if I exercise whilst taking it?
Yes, clinical evidence shows better results when Mounjaro is combined with regular exercise and a reduced-calorie diet. Exercise enhances weight loss, improves cardiovascular health, and supports muscle preservation. Your GP or prescriber can advise on safe exercise whilst taking Mounjaro, particularly regarding side effects like nausea.
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.