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 and Sunbeds: Cost and Access in the UK
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding the cost and how to access it is essential. This page covers private prescription costs across all doses, explains the differences between NHS and private access routes, and helps you understand what to expect when seeking treatment. Whether you're eligible through your GP or considering a private route, here's what you need to know about getting Mounjaro in the UK.
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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.
Private Mounjaro Costs by Dose in the UK
Private prescription costs for Mounjaro in the UK vary significantly by dose and provider. Most GPhC-registered online pharmacies charge between £129 and £320 per month, depending on which dose you're prescribed.
Here's the typical cost breakdown:
- 2.5 mg dose: approximately £129–£160 per month
- 5 mg dose: approximately £150–£180 per month
- 7.5 mg dose: approximately £170–£200 per month
- 10 mg dose: approximately £190–£240 per month
- 15 mg dose: approximately £260–£320 per month
Each Mounjaro KwikPen contains four weekly doses (one month supply). Prices may vary between providers, and some offer package discounts for three or six-month supplies. Always check that the pharmacy is GPhC-registered before purchasing online.
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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 Access Routes
NHS route: Mounjaro is available through tier 3 specialist weight management services, but only after referral from your GP. NHS availability varies significantly by region. Many areas have long waiting lists (sometimes 12–24 months), and some regions have limited capacity. Your GP will assess whether you meet NICE eligibility criteria based on your BMI and weight-related health conditions.
Private route: You can access Mounjaro privately through an online consultation with a UK-licensed prescriber, without NHS referral. Private prescription usually takes 24–48 hours. This route is faster but you pay the full cost. Dose titration (gradual increases from 2.5 mg) is still required, so expect at least 16–20 weeks to reach maximum dose, spread across multiple prescriptions.
- 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.
What's the difference between NHS and private Mounjaro access?
NHS Mounjaro is prescribed through specialist tier 3 weight management services following GP referral, but waiting lists are often very long (12–24 months in many areas). Private Mounjaro is accessed via online consultation with a UK prescriber and dispensed by GPhC-registered pharmacies within 24–48 hours. You pay full cost privately (£129–£320/month depending on dose), but there's no waiting list.
Do I need a full prescription for each Mounjaro dose increase?
Yes. Each dose increase requires a new prescription. Since Mounjaro dose titration begins at 2.5 mg and increases every 4 weeks up to 15 mg maximum, you'll need new prescriptions across multiple months. This means multiple costs over the titration period (typically 16–20 weeks to reach maintenance dose).
Is Mounjaro cheaper through the NHS?
Yes, if you can access it. NHS prescription costs are approximately £9.90 per item (or free if exempt). However, availability varies drastically by region, and waiting lists mean NHS access may take 12–24 months or longer. Private access is faster but costs £129–£320/month depending on dose.
How does Mounjaro vs Wegovy pricing compare in the UK?
Both Mounjaro and Wegovy cost roughly the same through private prescribing (£129–£320/month depending on equivalent dose). NHS costs would be identical. The choice between them is based on effectiveness, side effects, and your prescriber's recommendation—not cost. Mounjaro is a dual GIP/GLP-1 agonist; Wegovy is GLP-1 only.
What's included in the private Mounjaro cost?
Private costs cover the prescription and the medication (Mounjaro KwikPen containing 4 weekly doses). Most online prescribers charge a consultation fee (typically £15–£25) plus the medication cost. Repeat prescriptions for dose titration are additional costs. Delivery is usually free or £3–£5. ---
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