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 Cost Comparison in the UK
Finding affordable Mounjaro in the UK involves understanding the difference between NHS and private prescribing routes. Mounjaro (tirzepatide) is available through both pathways, but costs, eligibility, and waiting times vary significantly. This guide explains how to access Mounjaro at the best price, what the NHS covers, and what private prescribing typically costs. Use our free GLP-1 weight loss calculator to estimate potential outcomes and costs before starting treatment.
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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.
NHS Mounjaro Access and Eligibility
NHS Mounjaro availability: Tirzepatide is approved by NICE for use within NHS specialist weight management services (tier 3). However, NHS access is extremely limited and varies significantly by region. Most NHS integrated care boards (ICBs) have long waiting lists or do not currently fund tirzepatide for routine weight management.
- Eligibility: BMI ≥30 kg/m², or BMI ≥27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, or cardiovascular disease)
- Access route: GP referral to tier 3 specialist weight management service
- Cost: Free on NHS if prescribed through specialist services
- Wait time: Typically 6–18 months or longer, depending on region
- Ethnicity-adjusted thresholds: South Asian, Chinese, Black African, or Black Caribbean adults may qualify at BMI ≥27.5
NICE approval does not assures immediate access. Regional variation in commissioning means some areas have no tier 3 service provision for tirzepatide.
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.
Private Mounjaro Pricing and KwikPen Costs
Private prescribing route: Mounjaro is available through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber. This route is significantly faster than NHS referral.
- Typical cost: £129–£320 per month depending on dose and pharmacy
- Starter dose (2.5 mg): approximately £129–£180/month
- Maintenance doses (5–15 mg): approximately £200–£320/month
- Access time: Clinical assessment to delivery typically 2–7 days
- Mounjaro KwikPen: Each pen contains 4 weeks of doses
Private costs are not reimbursed by NHS but offer faster access. Shopping between different private providers can reveal price variations, though all legitimate routes require a valid prescription from a UK-licensed 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.
Is Mounjaro available on the NHS in the UK?
Mounjaro (tirzepatide) is NICE-approved for NHS use in specialist weight management services (tier 3). However, NHS availability is severely limited due to regional funding variations and long waiting lists. Most areas have waiting times of 6–18 months or longer. GP referral to a tier 3 service is required — it is not routinely available through standard GP prescription.
How much does Mounjaro cost privately in the UK?
Private Mounjaro typically costs £129–£320 per month depending on dose. Starter doses (2.5 mg) are around £129–£180, while maintenance doses (5–15 mg) range from £200–£320. Prices vary between pharmacies, so comparing providers may reveal savings. All private prescriptions require a clinical assessment from a UK-licensed prescriber.
What is the cheapest way to get Mounjaro in the UK?
The cheapest option is NHS prescription if you can access tier 3 weight management services — it is free. However, NHS waiting lists are very long in most regions. For faster access, private prescribing is typically £129–£320/month. Compare private pharmacy prices before committing, and use our free GLP-1 weight loss calculator to assess expected outcomes before starting.
How does Mounjaro's cost compare to Wegovy in the UK?
Mounjaro and Wegovy (semaglutide) have similar private pricing ranges (£129–£320/month), though exact costs depend on dose and pharmacy. Mounjaro is a dual GIP+GLP-1 agonist with potentially stronger weight loss in clinical trials, while Wegovy is a GLP-1 agonist only. Cost comparison should also consider efficacy, side effects, and individual response — use our GLP-1 calculator to project outcomes.
Can I get Mounjaro without a prescription in the UK?
No. Mounjaro is prescription-only and requires a clinical assessment by a UK-licensed prescriber before dispensing. This applies to both NHS and private routes. Any pharmacy offering Mounjaro without requiring a valid prescription is not operating legally. Always use GPhC-registered pharmacies for private prescriptions to ensure safety and authenticity.
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.