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
Mounjaro Diet Plan in the UK — Cost and Access Guide
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding how to access it and what it costs is essential. Mounjaro is a prescription-only weight loss injection that works alongside diet and lifestyle changes. Access is available through both NHS specialist services and private online prescribing routes, each with different timelines and costs. This guide explains your options, eligibility criteria, and what the process involves so you can make an informed decision about whether Mounjaro is right for you.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
How Much Does Mounjaro Cost in the UK?
Private prescription costs: Mounjaro through private online prescribing typically costs between £129 and £320 per month, depending on your dose. The 2.5 mg starting dose is usually at the lower end of this range, while the maximum 15 mg dose is at the higher end. Each KwikPen contains four weekly injections, so costs are usually quoted per pen or per month. Some private prescribers offer discount packages if you commit to longer treatment periods.
NHS access: If prescribed through the NHS, Mounjaro is provided at no charge (beyond your standard prescription fee of £9.90 if you're in England, or free if you're exempt). However, NHS access is limited and typically only available through specialist tier 3 or tier 4 weight management services. Waiting lists for NHS specialist services can be very long—in some areas, several months to over a year.
Additional costs to consider: Private consultations with a UK-licensed prescriber usually cost £20–£50 and are often required before a prescription is issued. You may also need repeat consultations every few months as your dose increases (minimum 4 weeks between dose increases). Storage costs are minimal—a standard home or office refrigerator is suitable for unopened pens.
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: Which Route is Right for You?
NHS route: Access via your GP referral to a specialist weight management service. You'll have a full multidisciplinary assessment covering diet, exercise, behaviour change, and medical history. Mounjaro is prescribed as part of a comprehensive weight management programme. Cost is free (or £9.90 per prescription in England). Trade-off: significant waiting times in many areas; availability varies by region (ICB); limited flexibility once you start.
Private route: Online consultation with a UK-licensed prescriber, typically a doctor or nurse prescriber registered with the MHRA. Assessment is faster (often within days), flexible, and you can start immediately if approved. You manage your own prescription refills and dose adjustments with your prescriber. Trade-off: higher cost; you are responsible for lifestyle support (though some providers offer optional diet or exercise guidance); longer-term commitment needed.
Try our free GLP-1 weight loss calculator to estimate potential outcomes at different doses—this can help you decide whether the investment in private treatment aligns with your goals. Use our BMI calculator to confirm your current starting point and eligibility threshold.
- 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 do I get Mounjaro prescribed through the NHS?
Ask your GP for a referral to your local tier 3 specialist weight management service. Your GP will assess whether specialist treatment is appropriate and refer you if eligible (typically BMI ≥30 or ≥27 with health conditions). The specialist service will conduct a full assessment and may prescribe Mounjaro as part of their programme. Waiting times vary significantly by region—check with your local ICB for realistic timelines.
Can I get Mounjaro through a private online consultation?
Yes. Private online prescribing is available through GPhC-registered pharmacies and licensed prescribers. You'll complete an online health questionnaire, have a consultation with a UK-licensed prescriber (usually by phone or video), and if approved, receive a prescription. The entire process typically takes 24–72 hours. You'll need to meet eligibility criteria (BMI ≥30 or ≥27 with comorbidities) and have no absolute contraindications.
What's the difference between Mounjaro and Wegovy in terms of cost?
Costs are similar—both typically range from £129–£320/month privately depending on dose. Mounjaro (tirzepatide) is a dual GIP+GLP-1 agonist with a maximum dose of 15 mg weekly. Wegovy (semaglutide) is a GLP-1 agonist only with a maximum dose of 2.4 mg weekly. Average weight loss in clinical trials was slightly higher for Mounjaro, but both require prescription and individual results vary significantly.
Do I need repeat consultations and prescriptions?
Yes. Private prescribers typically require follow-up consultations every 4–12 weeks, especially when increasing your dose (minimum 4 weeks between dose increases). These repeat consultations usually cost £20–£50 each or may be included in subscription packages. NHS specialist services provide ongoing monitoring and dose management as part of their programme at no extra cost beyond initial referral.
What should I expect during a private online consultation for Mounjaro?
You'll answer a detailed health questionnaire covering medical history, current medications, allergies, and lifestyle. A licensed prescriber will review this and conduct a phone or video consultation (typically 15–30 minutes) to assess suitability. They'll discuss eligibility, potential side effects, diet and exercise expectations, storage, and injection technique. If approved, a prescription is issued to a pharmacy within 24 hours, and your first KwikPen is usually dispatched within 2–3 working days.
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.