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 Comparison Price in the UK: NHS vs Private Routes
Mounjaro (tirzepatide) costs vary significantly depending on whether you access it through the NHS or privately in the UK. NHS access is typically free at point of use but involves specialist referral and waiting lists, whilst private routes involve upfront costs. Understanding the eligibility criteria, pricing, and what NICE recommends can help you make an informed decision about which route suits your situation. This guide explains both pathways and what to expect.
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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 Access to Mounjaro: Eligibility and Availability
NICE approval: Mounjaro (tirzepatide) was approved by NICE for use within NHS specialist weight management services for eligible adults. However, NHS availability remains patchy across different regions, and access is typically through tier 3 (specialist) weight management services, not your GP surgery.
Who is eligible on the NHS: You must have a BMI of 30 kg/m² or above, or BMI of 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds apply.
NHS costs: If prescribed through the NHS, Mounjaro is free at point of use (no prescription charge beyond the standard £9.90 if you're eligible). However, waiting lists vary dramatically by region — some areas have months or even years of waiting time.
NHS vs private: The NHS route avoids direct costs but requires specialist referral from your GP and acceptance into a tier 3 service. Use our free BMI calculator above to check if you might meet NHS eligibility criteria, then discuss with your GP about referral options in your area.
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 Costs and How to Access
Private prescription costs: Mounjaro via private online prescribing typically costs between £130–£320 per month, depending on the dose you're prescribed. The cost increases with each dose escalation (2.5 mg to 15 mg). A full treatment course starting at 2.5 mg and escalating to maintenance (typically 10–15 mg) over 4–5 months can cost £600–£1,200 before reaching steady state.
How to access privately: Private access requires an online clinical assessment with a UK-licensed prescriber, usually through GPhC-registered online pharmacies. No NHS referral is needed — you can access immediately if assessed as suitable. Prescription and medication costs are separate.
Mounjaro vs Wegovy pricing: Semaglutide (Wegovy) private pricing is similar (roughly £120–£300/month), though individual costs vary by provider. Our GLP-1 weight loss calculator can help you compare projected outcomes at different doses to inform your cost-benefit decision.
What Affects Mounjaro Price and Dose TitrationMounjaro pricing is typically tiered by dose strength. You'll start on the lowest dose (2.5 mg) and escalate weekly based on tolerability and response — this is called dose titration. The KwikPen device contains four weekly doses, so you'll need a new pen every month. Private providers may offer discounts for repeat prescriptions or bulk ordering.
Important factors: your prescriber may recommend slower titration if you experience side effects, which extends treatment costs. Additionally, if you stop and restart treatment, you may need to retitrate from a lower dose, extending overall costs. Always clarify pricing with your private provider upfront, including whether follow-up consultations are included and whether the price covers all dose escalations or just a single dose tier.
- 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 free on the NHS in the UK?
If prescribed through NHS specialist tier 3 weight management services, Mounjaro is free at point of use (no prescription charge beyond standard £9.90 if eligible). However, NHS access is limited and varies significantly by region — many areas have substantial waiting lists. NICE has approved it, but availability depends on your local ICB (integrated care board) commissioning the service.
How much does Mounjaro cost privately in the UK?
Private Mounjaro typically costs £130–£320 per month depending on your dose. Starting at 2.5 mg and escalating to a maintenance dose (10–15 mg) over 4–5 months costs approximately £600–£1,200. Costs are per dose strength, so titration involves increasing costs as you escalate. Always confirm pricing with your provider.
What is the difference between NHS and private Mounjaro access in the UK?
NHS access is free but requires GP referral to tier 3 services and may involve months of waiting. Private access avoids waiting lists but costs £130–£320/month. NHS eligibility requires BMI ≥30 (or ≥27 with comorbidities). Private access requires an online clinical assessment with a UK-licensed prescriber — no referral needed.
How does Mounjaro compare in price to Wegovy?
Wegovy (semaglutide) pricing is similar — roughly £120–£300/month privately. The costs depend on dose escalation and provider. Both are once-weekly injections and require monthly supplies. Clinical trial data shows Mounjaro achieved slightly higher average weight loss (20.9% vs 14.9%), though individual results vary significantly.
Will I need to pay for follow-up appointments with private Mounjaro prescribers?
This varies by provider. Some online prescribing services include check-in consultations within their monthly fee, whilst others charge separately for follow-ups. Always confirm whether ongoing prescriber consultations, clinical monitoring, or dose adjustments are included in the quoted price 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.