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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Monjaro Shot Cost and Access in the UK
Monjaro (tirzepatide), a once-weekly weight loss injection, is available in the UK through both NHS specialist services and private prescription routes. Costs vary significantly depending on which route you choose, your dose, and your region. Understanding how to access this GLP-1 receptor agonist and what you'll pay is essential before starting treatment. This guide explains UK pricing, eligibility, and the different pathways to getting Monjaro prescribed.
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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 Monjaro Costs in the UK
Private prescription costs for Monjaro in the UK typically range from £129 to £320 per month, depending on your dose and the pharmacy. Lower doses (2.5 mg to 5 mg) are generally less expensive, while higher maintenance doses (10 mg to 15 mg) cost more. Each KwikPen contains four weekly doses, so a monthly supply means one pen per month. Private access is available through GPhC-registered online pharmacies after an online clinical assessment with a UK-licensed prescriber — you do not need an NHS referral. The assessment cost is typically included or charged separately (usually £15–£50). Because you're starting at the lowest dose and titrating up over several weeks, your first month may cost less than subsequent months at higher doses. Use our GLP-1 weight loss calculator to estimate potential outcomes at different doses, which may help justify the investment in your treatment plan.
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 Access Routes
The NHS route is free but involves significant waiting times — you must be referred to a tier 3 specialist weight management service by your GP, and availability varies dramatically by region (ICB). Some areas have waiting lists of 6–18 months. The private route is faster (prescription within days) but you pay out of pocket. NHS specialist services typically prescribe Monjaro for adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or cardiovascular disease. Lower thresholds apply for South Asian, Chinese, Black African, and Black Caribbean adults. Private prescribers use the same eligibility criteria. Both routes require a clinical assessment to confirm suitability. If cost is a concern, discuss payment plans or lower-dose options with your prescriber.
- 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 a Monjaro shot cost in the UK privately?
Private Monjaro typically costs £129–£320 per month depending on your dose. The starting 2.5 mg dose is usually at the lower end, while the maximum 15 mg dose costs more. Prices vary slightly between GPhC-registered pharmacies. Each KwikPen contains four weekly doses.
Can I get Monjaro for free on the NHS?
Yes, Monjaro is available through NHS specialist tier 3 weight management services if you meet eligibility criteria (BMI 30+ or 27+ with health conditions). However, access requires GP referral and waiting lists are often 6–18 months depending on your region.
What happens during a private online clinical assessment for Monjaro?
A UK-licensed prescriber reviews your medical history, current medications, weight, height, and health conditions via an online consultation (usually 15–30 minutes). They assess suitability and explain how tirzepatide works. If approved, they issue a prescription to a GPhC pharmacy.
Is Monjaro more expensive than Wegovy in the UK?
Costs are similar — both typically range £129–£320/month depending on dose. Monjaro is a GIP receptor plus GLP-1 agonist (dual action), while Wegovy is GLP-1 only. Price differences between brands vary by pharmacy and dose.
Do I need to pay for follow-up appointments after getting a Monjaro prescription?
With private prescribers, follow-up consultations may be charged separately (£15–£50 per appointment) or included in packages offered by some online clinics. NHS services provide free follow-up within specialist services. Always clarify what's included before starting treatment.
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.