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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How to Get Private Mounjaro in the UK
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescribing routes. If you're considering private access, it's important to understand the eligibility criteria, how the prescription process works, and what costs to expect. This guide explains the differences between NHS and private routes, helping you make an informed decision about whether private Mounjaro is right for you. Both pathways require a clinical assessment from a UK-licensed prescriber.
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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 Eligibility in the UK
Private access to Mounjaro in the UK is available through GPhC-registered online prescribing services, following a clinical assessment by a UK-licensed prescriber. You do not need an NHS referral to a specialist tier 3 weight management service to access private Mounjaro.
Private eligibility typically follows similar criteria to NHS access: a BMI of 30 kg/m² or above, or 25–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. However, private prescribers may assess eligibility differently, and some may prescribe outside strict NHS thresholds.
Medical assessment for private Mounjaro involves completing a detailed health questionnaire, including medical history, current medications, and contraindications. The prescriber reviews this and issues a prescription if clinically appropriate. A Mounjaro KwikPen prescription is then dispensed by a GPhC-registered pharmacy.
Cost of private Mounjaro ranges from approximately £129–£300 per month depending on dose (starting at 2.5 mg through to 15 mg maximum). This includes the prescription, clinical assessment, and pharmacy dispensing. Costs are not covered by the NHS on the private route.
Use our free BMI calculator above to check whether you may meet initial eligibility criteria for weight loss treatment.
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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 Mounjaro — Key Differences
NHS Mounjaro access requires a referral from your GP to a specialist tier 3 or tier 4 weight management service. Waiting times can be several months to over a year depending on your region (ICB area). Once initiated through the NHS, Mounjaro is free, and ongoing support is provided by the specialist team. However, availability varies significantly by region—some areas have limited capacity.
Private Mounjaro is available without an NHS referral, typically within 1–2 weeks of online consultation. You pay for each dose individually. Private prescribers provide less ongoing specialist support, but you have flexibility and faster access. The KwikPen prescription can be obtained from any GPhC-registered pharmacy. Try our weight loss calculator to explore projected outcomes at different doses, which may help inform 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.
Can I access Mounjaro privately without seeing my GP first?
Yes. Private Mounjaro access does not require an NHS referral or GP involvement. You can complete an online clinical assessment directly with a UK-licensed prescriber through a private service. However, it's good practice to inform your GP that you're taking weight loss medication, especially if you have existing health conditions or take other medications.
How much does private Mounjaro cost in the UK?
Private Mounjaro costs typically range from £129–£300 per month depending on your dose. Starting dose (2.5 mg) is usually at the lower end, with maximum dose (15 mg) at the higher end. Each KwikPen contains 4 weeks of doses. Costs are not covered by the NHS and must be paid privately.
Is private Mounjaro the same as NHS Mounjaro?
Yes, the medication itself is identical. Both routes dispense the same Mounjaro KwikPen (tirzepatide) from Eli Lilly. The difference is in access route, waiting time, cost, and ongoing support. NHS provides specialist follow-up; private routes typically offer less ongoing clinical support but faster access.
What medical conditions might make me ineligible for private Mounjaro?
Contraindications include pregnancy, breastfeeding, personal or family history of medullary thyroid cancer, multiple endocrine neoplasia type 2, severe kidney disease, or allergy to tirzepatide. The prescriber will assess these during your clinical consultation. Certain medications may also require dose adjustment.
How long does it take to receive private Mounjaro once prescribed?
Most private services process prescriptions within 1–3 working days, with the KwikPen dispensed and dispatched by a GPhC-registered pharmacy. Delivery typically takes 2–5 working days via standard UK post or courier, so total time from consultation to receiving your first pen is usually 1–2 weeks.
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.