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 Facts — Cost, Access & How to Get It in the UK
Mounjaro (tirzepatide) is a prescription-only weight management injection licensed in the UK. Access depends on whether you pursue NHS or private routes, and costs vary significantly between them. This guide explains the key facts about Mounjaro eligibility, cost, and access in the UK, helping you understand your options whether through NHS specialist services or private online prescribing. Use our free BMI calculator above to check your eligibility based on NHS guidelines, and our GLP-1 weight loss calculator to estimate potential outcomes.
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.
Private Cost & Access — How Much Does Mounjaro Cost?
In the UK private market, Mounjaro is dispensed through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. Private costs range from approximately £129 to £320 per month, depending on your current dose and the provider. The Mounjaro KwikPen contains four weekly injections (one month's supply), and costs increase as you titrate through higher doses — from the starting 2.5 mg dose through to the maximum 15 mg maintenance dose. Prescribers typically require an initial consultation (often £40–£100) plus the medication cost. Private prescriptions offer faster access than NHS routes, with many people receiving their first dose within days of online consultation. However, private costs are not covered by insurance in most UK cases and represent an ongoing expense. Some private providers offer subscription or package pricing for multiple months, which can reduce per-month costs. It's important to budget for ongoing treatment — Mounjaro is typically a long-term commitment rather than a one-off course.
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 — Routes to Getting Mounjaro
The NHS route requires referral to a tier 3 specialist weight management service, usually via your GP. NICE has approved tirzepatide for use within NHS services, but availability varies dramatically by region and integrated care board (ICB). Waiting lists can extend months or even years in many areas. The NHS route is free once prescribed, but involves assessment delays and regional postcode lottery. The private route offers immediate access without NHS referral — you complete an online consultation, a prescriber reviews your health information, and if approved, a prescription is issued to a pharmacy. Both routes require clinical assessment to confirm eligibility: BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions like type 2 diabetes or hypertension. Consider your circumstances — NHS offers free medication but slower access; private offers speed but ongoing costs.
- 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 typical cost of Mounjaro per month in the UK?
Private costs typically range from £129 to £320 monthly depending on your dose, with higher doses costing more. Initial consultations add £40–£100. NHS prescriptions are free once approved, but access involves significant waiting times. Costs vary by provider — some offer package pricing for multiple months.
How do I access Mounjaro on the NHS in the UK?
Request a referral from your GP to a tier 3 specialist weight management service. NICE has approved tirzepatide for NHS use, but availability varies by region and waiting lists can be very long. You'll need a BMI of 30 or above, or 27–29.9 with weight-related health conditions.
Can I get Mounjaro privately without NHS referral?
Yes. You can access Mounjaro privately through GPhC-registered online pharmacies. Complete an online consultation with a UK-licensed prescriber, and if approved, receive a prescription dispensed directly. This typically takes days, not months, but involves ongoing private costs.
What's included in the cost of a Mounjaro KwikPen?
Each KwikPen contains four weekly injections — one month's supply. The cost covers the medication only; initial consultations with prescribers are additional. Storage and disposal are your responsibility, though sharps bins are typically provided.
Am I eligible for Mounjaro in the UK?
You may be eligible if you have a BMI of 30 or above, or 27–29.9 with at least one weight-related health condition (diabetes, hypertension, sleep apnoea, cardiovascular disease). Use our free BMI calculator above to check your starting point, then consult your GP or a private prescriber for personalised assessment.
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.