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
Where Can I Get Mounjaro From in the UK?
Mounjaro (tirzepatide) is available in the UK through two main routes: NHS specialist weight management services and private prescription following an online clinical assessment. Access, waiting times, and costs differ significantly between the two routes. This guide explains where to get Mounjaro, what it costs, and what to expect from each pathway. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses while you consider your options.
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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 Access and Costs in the UK
Private prescription is the fastest route to Mounjaro in the UK. You can obtain a prescription through GPhC-registered online pharmacies without an NHS referral. The process involves an online consultation with a UK-licensed prescriber who assesses your suitability based on your BMI, medical history, and current medications.
- Typical cost: £150–£280 per month depending on dose and provider
- Starting dose (2.5 mg): approximately £150–£170 per month
- Higher doses (10–15 mg): approximately £240–£280 per month
- Delivery: usually within 2–5 working days
- Ongoing prescriptions: repeat consultations required (typically every 3 months)
Each KwikPen device contains four weeks' supply. Costs can add up significantly over time, so private Mounjaro is typically an investment. Many people find the rapid access worth the cost, especially if NHS waiting times in their area are lengthy.
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 Access vs Private: Which Route Is Right for You?
NHS access to Mounjaro is free at point of use but involves referral to a specialist tier 3 or tier 4 weight management service through your GP. NICE has approved tirzepatide for NHS use, but regional availability varies significantly. Some areas have waiting lists of 6–18 months; others may not currently offer it. Your GP can refer you if you meet eligibility criteria (BMI 30+ or BMI 27–29.9 with weight-related health conditions). The advantage is cost — Mounjaro is free on the NHS. The trade-off is waiting time and potential regional unavailability. Check your local Integrated Care Board (ICB) website to see current availability in your area before requesting a referral.
- 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 is the typical cost of Mounjaro per month in the UK?
Private Mounjaro costs approximately £150–£280 per month depending on your dose. Starting doses (2.5 mg) are around £150–£170, while higher maintenance doses (10–15 mg) cost £240–£280. Each KwikPen lasts four weeks. On the NHS, Mounjaro is free, but access involves waiting lists and regional variation.
How do I get Mounjaro on the NHS in the UK?
Request a referral from your GP to your local specialist weight management service (tier 3 or tier 4). You must meet eligibility criteria: BMI 30 or above, or BMI 27–29.9 with weight-related health conditions. NICE has approved it, but availability and waiting times vary by region. Check your local ICB website for current provision.
Can I get Mounjaro through a private prescription without seeing my GP?
Yes. You can obtain a private prescription through a GPhC-registered online pharmacy. Complete an online consultation with a UK-licensed prescriber, who will assess your suitability. If approved, you receive a prescription and the medication is dispensed and delivered. No GP involvement is required for private access.
How long does it take to get Mounjaro privately vs on the NHS?
Privately, you can start within 2–5 working days of approval. On the NHS, waiting times vary from weeks to 18+ months depending on your area. Private access is significantly faster but costs £150–£280 monthly. NHS access is free but involves waiting and potential regional unavailability.
Is Mounjaro the same as tirzepatide, and does the source matter?
Yes, Mounjaro is the brand name for tirzepatide. Whether you get it privately or via the NHS, it's the same medication and dose titration schedule. The difference is cost, waiting time, and prescriber type. Private prescribers are UK-licensed; NHS prescribers are specialists. Clinical outcomes are not different between sources.
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.