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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Getting a Mounjaro Prescription in the UK: NHS and Private Routes
Mounjaro (tirzepatide) is available by prescription in the UK through both NHS specialist services and private online prescribing routes. Access and costs vary significantly depending on which pathway you choose. The NHS offers Mounjaro through tier 3 specialist weight management services, though availability and waiting times differ across regions. Private prescriptions are available through licensed UK prescribers following an online clinical assessment. Understanding your options, eligibility criteria, and what to expect can help you make an informed decision about accessing this prescription weight loss medication.
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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 Prescription Costs and Access Routes
In the UK, private Mounjaro prescriptions typically cost between £129 and £320 per month, depending on your dose and the pharmacy provider. Costs vary because different private prescribers and pharmacies set their own pricing. A 4-week supply of a single dose (one KwikPen containing four injections) generally costs less than the maximum dose. The private route requires an online clinical assessment with a UK-licensed prescriber, after which a prescription is issued if clinically appropriate. You'll then receive your medication from a GPhC-registered pharmacy, usually within 2–5 working days. Private prescriptions offer faster access without NHS waiting lists, though you pay the full cost yourself. Some people use our free GLP-1 weight loss calculator to estimate potential results at different doses before committing to treatment, helping inform their decision about whether the investment is worthwhile for their health goals.
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: How to Access Mounjaro
NHS access: Mounjaro is available through specialist tier 3 weight management services, typically after referral from your GP. NICE (National Institute for Health and Care Excellence) has approved tirzepatide for NHS use, but regional variation means some ICBs (Integrated Care Boards) have it available while others have long waiting lists or limited access. NHS treatment is free at point of care, but waiting times can be months or longer depending on your area.
Private access: Available immediately through online prescribing without NHS referral. Complete an online health questionnaire, discuss with a prescriber, and receive your prescription within hours. Your GP doesn't need to be involved. This route suits those who want faster access or prefer privacy, though you pay the full cost. Use our BMI calculator to confirm your eligibility before starting an online consultation.
To access Mounjaro privately, the process is straightforward: complete an online health assessment, declare relevant medical history and current medications, have a brief video or telephone consultation with a UK-licensed prescriber, and receive your prescription if approved. The prescriber will assess whether Mounjaro is suitable based on your BMI, health conditions, and medications. Typical eligibility includes a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. Once prescribed, your medication is dispensed by a registered pharmacy. For NHS access, ask your GP about referral to your local specialist weight management service, though availability varies by region. Be aware that waiting lists for NHS tier 3 services can be substantial in many areas, sometimes exceeding 12 months.
- 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.
How much does Mounjaro cost privately in the UK?
Private Mounjaro prescriptions typically cost £129–£320 per month depending on dose and provider. Starter doses (2.5 mg or 5 mg) are usually cheaper than maintenance doses (10 mg, 15 mg). Costs can vary between private prescribers, so it's worth comparing. Each KwikPen contains a 4-week supply.
Can I get Mounjaro on the NHS for weight loss?
Yes. Mounjaro is available on the NHS through specialist tier 3 weight management services. You'll need a GP referral and must meet eligibility criteria (BMI ≥30, or ≥27 with weight-related conditions). However, availability varies significantly by region and waiting lists can be very long—sometimes 6–18 months.
How do I get a private Mounjaro prescription online?
Complete an online health questionnaire with a UK-licensed prescriber, discuss your medical history and current medications, have a brief consultation, and receive your prescription if approved. The whole process typically takes a few hours. You'll then collect your medication from a GPhC-registered pharmacy.
What's the difference between NHS and private Mounjaro?
NHS is free but involves waiting lists (varies by region) and GP referral to specialist services. Private is faster (hours to days), more accessible without NHS involvement, but costs £129–£320/month. The medication itself is identical; only access route differs.
Am I eligible for Mounjaro on NHS or privately?
Generally, you need a BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, cardiovascular disease). South Asian, Chinese, Black African, or Caribbean adults may have slightly lower thresholds. A prescriber will assess your individual eligibility during consultation.
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.