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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Mounjaro Diet Plan for Weight Loss: UK Cost and Access
If you're considering Mounjaro (tirzepatide) as a weekly weight loss injection in the UK, understanding the cost and how to access it is essential. Mounjaro is a prescription-only medicine available through both NHS specialist services and private online prescribing routes. This guide explains the realistic costs, eligibility criteria, and what the prescription process involves so you can make an informed decision about whether this medication is right for you.
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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.
How Much Does Mounjaro Cost in the UK?
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on your dose and the provider. Starting doses (2.5 mg) are usually at the lower end, while higher maintenance doses (15 mg) cost more. Each KwikPen contains 4 weeks' supply — one injection per week — so monthly costs reflect a single pen.
It's important to understand that Mounjaro is not currently widely available on the NHS for routine weight management. While NICE has approved tirzepatide within NHS specialist tier 3/4 weight management services, actual access varies significantly by region and availability. Many areas have lengthy waiting lists or limited funding. Private prescription offers faster access but at personal cost.
- Starting dose (2.5 mg): approximately £129–£150/month
- Intermediate doses (5–10 mg): approximately £180–£250/month
- Maximum dose (15 mg): approximately £300–£320/month
Costs may vary between providers — comparing options before committing is advisable. Some private services offer subscription models or package discounts for longer commitments.
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
NHS route: Referral to a tier 3 specialist weight management service through your GP. Assessment may take months due to waiting lists. If approved, treatment is free but availability and range of medications vary by region (Integrated Care Board).
Private route: Online consultation with a UK-licensed prescriber (usually takes 24–48 hours). If clinically appropriate following assessment, a prescription is issued to a GPhC-registered pharmacy. Faster access but you pay the full cost. Both routes require a clinical assessment — Mounjaro is never available without one.
Use our GLP-1 weight loss calculator above to estimate potential weight loss outcomes at different doses, and our BMI calculator to check your starting point. Both tools help you understand whether prescription weight loss support might be appropriate for you before booking a consultation.
- 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.
Is Mounjaro available on the NHS in the UK?
NICE approved tirzepatide (Mounjaro) for NHS use within specialist tier 3/4 weight management services, but actual availability and access vary significantly by region. Many areas have lengthy waiting lists. Private prescription offers faster access at personal cost.
What is included in the monthly cost of Mounjaro?
The monthly cost covers one KwikPen (4 weeks' supply with 4 weekly injections). This is the medication only — GP consultations, blood tests, or follow-up appointments may incur separate costs depending on your provider.
How do I get a Mounjaro prescription privately in the UK?
You complete an online consultation with a UK-licensed prescriber, providing health history and current medications. If approved following assessment, a prescription is issued to a GPhC-registered pharmacy. The process typically takes 24–48 hours. You'll need to pay the full cost.
Can I switch from NHS to private Mounjaro treatment?
Yes. If you're on an NHS waiting list or NHS treatment, you can choose to pursue private prescription at any time. Inform your GP of the change. Conversely, if you start privately, you can ask your GP for an NHS referral, though this doesn't assures faster NHS access.
Does private Mounjaro prescription include ongoing GP support?
This depends on your provider. Some private services include follow-up consultations and dose adjustments within the cost; others charge separately. Always clarify what's included before purchasing. Your NHS GP can also monitor your progress if you inform them you're taking Mounjaro privately.
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.