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 Multipack — Cost and Access in the UK
A Mounjaro multipack contains four weeks' worth of tirzepatide injections in pre-filled KwikPen devices. In the UK, you can access Mounjaro through either NHS specialist weight management services or private online prescribing. Costs, availability, and waiting times differ significantly between these routes. This guide explains how to access Mounjaro, what it costs, and what the prescription process involves so you can make an informed decision about your weight management options.
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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.
Mounjaro Multipack Costs in UK Private Prescribing
When accessed through private UK prescribing services, a Mounjaro multipack (four weeks' supply at a single dose) typically costs between £129 and £320 depending on your dose level. Starting doses (2.5 mg and 5 mg) are generally at the lower end of this range, while higher maintenance doses (10 mg, 12.5 mg, 15 mg) cost more. Each KwikPen contains exactly four weekly injections, so one multipack = one month of treatment. Private costs include both the prescriber's clinical assessment fee and the pharmacy dispensing fee. Some services offer subscription models where you pay monthly for ongoing supply plus clinical support. Unlike some other weight loss injections, Mounjaro costs are consistent across most UK private providers, though pricing can vary slightly. When comparing costs, check whether your quoted price includes the initial consultation, repeat prescription fees, and any follow-up clinical support included in your plan.
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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 — Availability and Timeline
NHS access to Mounjaro is through tier 3 specialist weight management services following a GP referral. NICE has approved tirzepatide for NHS use, but regional availability varies significantly — some areas have waiting lists of 12+ months. NHS prescriptions are free once approved. Private access is faster: you complete an online consultation with a UK-licensed prescriber, receive a prescription if eligible, and collect from a GPhC-registered pharmacy within days. Private costs apply from the start, but there's no waiting list. Choose based on your circumstances: NHS if you can wait and prefer free treatment; private if you need faster access and can budget for costs. Our GLP-1 weight loss calculator can help you estimate potential outcomes at different doses to guide your decision.
- 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 included in a Mounjaro multipack?
A multipack contains four pre-filled KwikPen devices, each delivering one weekly dose of tirzepatide. Depending on your prescription, all four pens in a multipack contain the same dose (e.g., all 5 mg), or they may contain different doses if you're in the titration phase (e.g., 2.5 mg, 5 mg, 7.5 mg, 10 mg over four weeks).
How much does a Mounjaro multipack cost on the NHS?
Mounjaro is free on the NHS once approved by a specialist weight management service. However, access requires a GP referral and assessment by a tier 3 service. Waiting times vary by region, sometimes 6–18 months. Cost is not a barrier on the NHS, but availability and timeline are considerations.
Can I buy a Mounjaro multipack without a prescription in the UK?
No. Mounjaro is prescription-only in the UK. You cannot purchase it without a valid prescription from a UK-licensed prescriber. You must complete a clinical assessment first to confirm it's safe and appropriate for you.
How do I get a private prescription for Mounjaro in the UK?
Book an online consultation with a UK-registered prescriber through a private weight management service. You'll answer health questions, have a video or telephone assessment, and receive a prescription if eligible. The prescription is then sent to a GPhC-registered pharmacy for dispensing.
Is Mounjaro cheaper than Wegovy in the UK?
Costs are similar — both typically range from £129–£320 per month depending on dose. Wegovy may have slightly different pricing at certain doses, but the overall cost is comparable. Check pricing at the time of consultation, as rates can vary by provider.
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.