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 Injection: Cost and Access in the UK
Monjaro (tirzepatide) is a prescription-only weekly weight loss injection licensed in the UK. Access and cost vary significantly depending on whether you pursue NHS treatment through specialist services or opt for private prescription through a UK-licensed prescriber. This guide explains both routes, typical costs, eligibility criteria, and how the online consultation process works so you can understand your options for accessing this weekly weight loss injection.
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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 vary by dose and provider. Typical pricing ranges from approximately £129 to £320 per month, depending on which dose you're taking. Doses increase progressively from 2.5 mg to a maximum of 15 mg, with most users settling at a maintenance dose between 5 mg and 15 mg. A single Monjaro KwikPen contains 4 weekly doses, so monthly costs reflect one pen per month on lower doses and potentially more than one pen on higher doses. As a GIP and GLP-1 receptor agonist, Monjaro is more recently available than some alternatives, which may affect pricing in the private market. Many UK prescribers now offer tirzepatide through online consultation platforms, making access more straightforward than NHS routes, though costs remain out-of-pocket.
- Starting dose (2.5 mg): Usually the lowest cost tier
- Maintenance doses (5–15 mg): Mid-to-higher cost tiers
- Annual cost: Ranges approximately £1,500–£3,840 depending on final dose
- No NHS prescription charge applies — private prescriptions are paid in full by the patient
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
NHS access to Monjaro is limited and varies by region. NICE has approved tirzepatide for NHS use within specialist weight management services (tier 3/4), but access depends on your local Integrated Care Board (ICB) and current service capacity. Many regions have long waiting lists. To access Monjaro through the NHS, you typically need referral from your GP to a specialist tier 3 weight management service, where a multidisciplinary team assesses your eligibility. Private prescription offers faster access: complete an online clinical assessment with a UK-licensed prescriber, receive a prescription if suitable, and have your Monjaro dispensed by a GPhC-registered pharmacy. Use our free GLP-1 weight loss calculator to explore potential outcomes while you decide which route suits you best.
- NHS: Free (if eligible), but waiting lists can exceed 6–12 months in many areas
- Private: £129–£320/month, immediate access following assessment
- 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 Monjaro cost on the NHS in the UK?
If you're eligible and access Monjaro through an NHS specialist weight management service, you pay nothing — it's provided free under the NHS prescription charge system. However, NHS availability is very limited and varies greatly by region. Waiting times to specialist services can be many months in some areas.
What happens during a private online Monjaro consultation?
You complete an online health questionnaire covering your medical history, current medications, weight, height, and BMI. A UK-licensed prescriber reviews this and may request blood pressure or additional information. If they assess you as suitable for tirzepatide, they issue a prescription, which is then dispensed by a GPhC-registered pharmacy. The whole process typically takes 24–48 hours.
Is Monjaro more expensive than Wegovy in the UK?
Costs are generally comparable — both weekly GLP-1/GIP injections typically range £129–£320/month depending on dose. Direct comparison depends on your final maintenance dose and the specific provider. Use our weight loss calculator to compare projected outcomes at different doses.
Can I get Monjaro on a private prescription from my GP?
Some GPs may issue private prescriptions for Monjaro, but it's not common. Most UK patients access private Monjaro through online prescribing services after completing an online clinical assessment, which is faster and more straightforward than requesting a private prescription from a standard GP practice.
What should I check before starting private Monjaro treatment?
Verify the prescriber is a UK-licensed doctor (GMC-registered), the pharmacy is GPhC-registered, and that you understand the storage requirements (refrigerate unopened pens at 2–8°C). Confirm costs per dose and whether follow-up support is included. Always check return/cancellation policies before purchasing.
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.